Auckland Tauranga Wellington Christchurch
PATTLE DELAMORE PARTNERS LTD
Assessment of Environmental Effects associated with Hanmer Public Water Supply
Hurunui District Council
solutions for your environment
Assessment of Environmental Effects associated with Hanmer Public Water Supply
• Prepared for Hurunui District Council
• October 2018
PATTLE DELAMORE PARTNERS LTD 295 Blenheim Road Tel +64 3 345 7100 Fax +64 3 345 7101 Upper Riccarton, Christchurch 8041 Website http://www.pdp.co.nz PO Box 389, Christchurch 8140, New Zealand Auckland Tauranga Wellington Christchurch
C03265401_R001_FINAL
ii
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
Table of Contents
SECTION PAGE
1.0 Introduction 1
2.0 Description of Proposed Activity 2 2.1 Proposed Community Drinking-water Protection Zone 3
3.0 Activity Status 3 3.1 Resource Management Act 1991 (RMA) 3 3.2 National Environmental Standard 4 3.3 Hurunui and Waiau River Regional Plan (HWRRP) 4 3.4 Other Canterbury Regional Plans 6
4.0 Description of the Affected Environment 6 4.1 General Catchment Description 6 4.2 Existing Users and Flow and Allocation Regime in the Chatterton River 7
5.0 Assessment of Effects Associated with the Proposal 8 5.1 Matters of Discretion for Take, Use and Divert of Water 8 5.2 Effects on Water Quantity 9 5.3 Effects on Existing Users 11 5.4 Effects on Water Quality 12 5.5 Effects on Fish Passage 12 5.6 Reasonable and Efficient Use 13 5.7 Water Supply Asset Management Strategy 14 5.8 Effects on Tangata Whenua Values 15 5.9 Potential Benefits of the Activity 15
6.0 Compliance with Drinking Water NES 15
7.0 Mitigation Measures 16
8.0 Consultation 16
9.0 Consideration of alternatives 16
10.0 Section 104 matters 17 10.1 Matters to be Considered 17 10.2 National Environmental Standards 18 10.3 National Policy Statement for Freshwater Management 18 10.4 Canterbury Regional Policy Statement 2013 19 10.5 Hurunui Waiau River Regional Plan 20 10.6 Iwi Management Plans 23 10.7 Canterbury Water Management Strategy 25
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D iii
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO CIA T E D WITH HANMER PUB LIC WATER SUPPLY
10.8 Section 104D 26
11.0 Restrictions on Granting of Discharge Consents 27
12.0 Part II Purpose and Principles 27 12.1 Purpose of the Act – Section 5 27 12.2 Matters of National Importance – Section 6 28 12.3 Other Matters – Section 7 29 12.4 The Principles of the Treaty of Waitangi 29
13.0 Notification 29
14.0 Proposed Consent Conditions 30
15.0 Conclusions 32
16.0 References 33
Appendices
Appendix A: Figures
Appendix B: Existing HDC Consents
Appendix C: HDC water supply asset management strategy
Appendix D: Flow and water depth data for the Rogerson River
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 1
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
1.0 Introduction Pattle Delamore Partners Ltd (PDP) has been engaged by Hurunui District Council (HDC) to prepare an assessment of environmental effects arising from a consent variation to divert, take, and use water from the Rogerson River and Dillons Stream and to discharge water into the Rogerson River near Rogerson Road, Hanmer Springs. Hurunui District Council (HDC) currently abstracts water from the Rogerson River and/or Dillons Stream to supply Hanmer Township with potable water. Primary abstraction from the Rogerson River is via a large concrete weir and a number of galleries under the riverbed. Abstraction from Dillons Stream is via an intake weir. Consent CRC981514 authorises the take of up to 18.5 litres per second and a diversion of up to 47.5 litres per second from the Rogerson River. Consent CRC981515 authorises the discharge of up to 40.5 litres per second back into the Rogerson River and CRC000283 authorises the works in the beds of the Dillons Stream and Rogerson River for maintenance and/or reconstruction of the intake structures in these waterways should that be required. The water diversion is into an open reservoir with a total capacity of 14,000 cubic metres, consisting of a 2,000 cubic metres settling pond and a 12,000 cubic metre main pond. From the main pond, the water is gravity fed to two tanks feeding the public water supply network. HDC is applying for new consents to divert, take and use up to a maximum combined rate of 68.3 litres per second from Rogerson River and Dillon Stream to accommodate anticipated future growth in both permanent population and tourists. In addition it is proposed to apply for a new discharge consent to increase the discharge back to the Rogerson River to 68.3 L/s. No changes are proposed to CRC000283. The proposed takes are within the Chatterton River catchment and ECan have indicated that (excluding the existing consented HDC take of 18.5 L/s) 68.3 L/s is available for allocation in the Chatterton River catchment. This consent application has been prepared on behalf of HDC by PDP and includes: • Details of the proposed activity; • A description of relevant legal and planning matters; • A description of the existing environment; • An Assessment of Environmental Effects; • Consideration of alternatives; and • A description of the proposed mitigation measures.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 2
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
The location of the weir and galleries in the Rogerson River and Dillons Stream is shown in Appendix A (Figure 1 and Figure 2) and a copy of the consents are included in Appendix B. A copy of the HDC water supply asset management strategy is included in Appendix C which describes how water usage will be reduced at times of low flow. The consent duration sought for the new consents is 35 years. The new take, use, divert and discharge consents sought under this application will replace consent CRC981514 and CRC981515 and HDC will surrender consent CRC981514 and CRC981515 if the new consents are granted for a period of 35 years.
2.0 Description of Proposed Activity The area served by the Hanmer public water supply is the Hanmer urban area and is registered as a minor water supply on the Drinking Water Supplies Register. The supply is on-demand servicing of residential and commercial connections. There are currently around 1,380 connections into the network. The water use includes domestic and commercial takes and servicing of the thermal pools. The current consent consists of: • CRC981514 (Rogerson River): Maximum diversion rate of 47.5 litres per second and maximum take rate of 18.5 litres per second. • CRC981515 (Rogerson River): Maximum discharge of 40.5 litres per second. HDC also used to hold consent CRC961844 to take water from Dillon Stream. This consent is expired. The open reservoir relies on the diversion and discharging of water back to the Rogerson River via an overflow weir to maintain sufficient throughflow in the reservoirs in order to prevent algae growth (especially in spring/summer). This is the main reason that the diversion from the Rogerson River is currently greater than the rate of take. The water in the open reservoir then flows into two 810 cubic metre tanks (controlled by an electronic on/off valve) which supplies the network. The treatment of the water occurs between the open reservoir and the two structures by means of lime dosing and chlorination. One critical point of difference with other public water supplies is the transient nature of the population at Hanmer Springs. Although there are currently approximately 1,380 connections, many dwellings (holiday homes) have absentee owners so the permanent population is quite a bit lower. During peak periods (such as the Christmas period), the number of people can rise to around 6,000. Further details on what this means for current and expected future water
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 3
HURUNUI DISTR ICT COUNCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
demand are provided in Section 5.6. The application for a consent to divert, take and discharge at a maximum rate of 68.3 litres per second, is to accommodate the future water requirements associated with the anticipated growth of the Hanmer Township. Information provided by HDC indicates a clear seasonal trend in water use with water demand being high in the January, February and March period and low during winter (June, July and August). Daily demand over the peak period can be up to around 2,400 m3/day (mean daily flow rate of around 28 L/s).
2.1 Proposed Community Drinking-water Protection Zone In order to increase the level of protection for the Hanmer Springs Community Drinking - water supply HDC is proposing to increase the provisional drinking water protection zone as shown on ECan’s online GIS mapping website. The provisional drinking water protection zones for the intakes from the Rogerson River and Dillons Stream extent approximately 1,000 m upstream and 100 m downstream of the weir intakes and have a width (across the bed of the Rogerson River and Dillons Stream) of approximately 100 m. The proposed protection zone covers the full upstream catchment area of the Rogerson River and Dillons Stream from the point 100 m downstream of the weir intakes. Appendix A, Figure 3 shows the area proposed to be included. The larger zone is in line with national guidance of management of risk to drinking water supplies. In this case the catchments are relatively small and currently predominantly consist of forested areas. HDC are keen to ensure that activities within the zone (for example: weed spraying, pest control, sediment runoff from forestry activities etc.) are managed to ensure they do not adversely affect the community water supply. This application has been forwarded to the landowners within the proposed drinking water protection zone for their written approval.
3.0 Activity Status 3.1 Resource Management Act 1991 (RMA) The purpose of the RMA 1991 is to promote the sustainable management of natural and physical resources. Part III of the RMA sets out duties and restrictions under the Act. Where the Act or a regional plan requires authorisation for an activity, that authorisation can only be derived from a rule in a regional plan or resource consent. Section 14(3)(a) of the Resource Management Act 1991 (RMA) states that a person is not prohibited from taking, using, damming or diverting water if the taking, using damming or diverting is expressly allowed by a national
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 4
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
environmental standard, a rule in a regional plan as well as a rule in a proposed regional plan, or a resource consent. Section 15(1)(a) of the Act states that no person may discharge any contaminant or water into water unless the discharge is expressly allowed by a national environmental standard or other regulations, a rule in a regional plan as well as a rules in any relevant proposed regional plan for the same region (if there is one), or a resource consent. The relevant regional plan to consider for the activity status of the proposed divert, take, use and discharge of water is the Hurunui and Waiau River Regional Plan (HWRRP).
3.2 National Environmental Standard The National Environmental Standard for Sources of Human Drinking Water (NES) came into effect on 20 June 2008. The intent of this regulation is to reduce the risk of contaminating drinking water sources such as rivers and groundwater. It does this by requiring regional councils to consider the effects of the activity on drinking water sources in their decision making. The proposed activity is an abstraction for a community drinking water supply and consideration of this NES must be given. The Hanmer public water supply currently provides human drinking water for about 1,380 connections with peak holiday times reaching up to 6,000 people. This supply is identified on the Drinking Water Supplies Register as a minor supply.
3.3 Hurunui and Waiau River Regional Plan (HWRRP) The Hurunui and Waiau River Regional Plan (HWRRP) has been operative since 20 December 2013 and applies to the taking, use and diversion of surface water as well as the discharge of water within the Waiau Catchment. The relevant rules to consider for the activity are Rule 2.2, Rule 2.1 and Rule 4.2. Rule 2.2 applies to the taking, using or diverting of surface water for a community supply and/or stock drinking water supply. Under this rule, the activity is classified as a restricted discretionary activity, provided it complies with a set of standards and terms. Condition (a) requires that the consent holder have a Water Supply Asset Management Strategy in place. A Water Supply Asset Management Strategy has been prepared (Appendix C) and it is expected that that strategy will be implemented shortly. Condition (b) requires that fish be prevented from entering the water intake as set out in Schedule 4 of the HWRRP. As detailed in Section 2.0 the take from the Rogerson River is via galleries across the river-bed. The ‘Fish screening: good
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 5
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASS O C I A T E D WITH HANMER PUBLIC WATER SUPPLY
practice guidelines for Canterbury’s (NIWA, October 2007) considers galleries ‘effective at screening fish of a wide range of sizes, and with a high level of certainty’. Therefore it is considered that fish are prevented from entering the gallery intakes. For the weir intakes from the Rogerson River and for Dillons Stream the applicant has proposed conditions in accordance with Schedule 2 and as such it is expected that this condition will be met. These conditions are met, and thus the taking, using and diverting of water for the Hanmer Public Water Supply Network is classified as a restricted discretionary activity, and resource consent is required.
The matters for discretion are restricted to: (i) reasonable need for the quantities and the ability for the applicant to abstract those quantities, and whether storage of water is proposed; (ii) the availability and practicality of using alternative supplies; (iii) the adequacy of the Water Supply Asset Management Strategy in achieving the amount of water taken and used at times of low flow; (iv) the efficiency of the exercise of the resource consent having regard to Policy 8.1; (v) the effects the take has on surface water flows, including floods, freshes and prolonging periods of low flow having regard to Policy 2.5; (vi) the effects the take has on any other authorised takes; (vii) the reduction in the rate and/or volume of water taken during times of low flow having regard to Policies 2.3 and 2.4; (viii) the collection, recording, monitoring and provision of information concerning the exercise of resource consent having regard to Policy 8.1; (ix) the matters in Policy 1.4; and (x) consent duration, having regard to Policies 9.1 and 9.2. Rule 2.1 applies to the taking, diverting, using and discharging of surface water for any non-consumptive activity. Under this rule, the discharge activity is classified as a restricted discretionary activity, provided it complies with a set of standards and terms. The distance between the point of take and discharge is greater than 250 metres for both the Rogerson River intakes and Dillons Stream intake and as such condition (b) cannot be met and the discharge becomes non- complying under Rule 4.2. It is considered that the overall activity status of the proposed activity is Non- Complying. For the avoidance of doubt HDC is seeking consent under the above rules and any other rules which may apply to the activity, even if not specifically noted.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 6
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
3.4 Other Canterbury Regional Plans Section 1.1 of the HWRRP provides the scope of the Plan. It goes on to state that where an activity is expressly provided for within the HWRRP, the provisions of the HWRRP apply. For all other activities, the provisions in the Canterbury Natural Resources Regional Plan (NRRP) and/or the Land and Water Regional Plan (LWRP) apply. This application is strictly limited to the take, use, diverting and discharge of water and as such, the LWRP is not applicable.
4.0 Description of the Affected Environment 4.1 General Catchment Description Several reports describe the hydrology of the Waiau Catchment (including the area around Hanmer). The most notable reports include Mosley (2004), Facer (2003) and Bowden (1974). A description of the Hydrology of the Rogerson River and Dillons Stream is provided by HDC (2006). This short catchment description draws on information from these reports and available flow data provided by Environment Canterbury. The Rogerson River and Dillons Stream originate from the Hanmer Range near Hanmer Springs. The Rogerson catchment is approximately 19 km2. The catchment consists largely of native bush and scrub at the lower levels, and tussock, open scree, and rocky tops. The catchment length above the weir intake is 9.1 km, extending up from 440.7 masl at the intake to 1785 masl at Mount Captain. The Rogerson River confluences with the Chatterton River near Hanmer Springs township and eventually flows into the Waiau River via the Percival River. Dillons Stream (at the intake) has a catchment area of approximately 9.5 km 2 and is a tributary of Rogerson River. The Dillon catchment is smaller and steeper than the Rogerson at 950 ha. The lower eastern side consists mostly of exotic pipe plantings. The western side of the catchment is scrub, with little native bush and some exotic plantings. The catchment is around 4.1 km from the weir extending up from 441.4 masl to an elevation of 1437 masl. Mean annual rainfall in the Rogerson and Dillon catchments varies from around 2,000 mm at higher elevations near the western boundary of the Rogerson Catchment to around 1,200 mm near Hanmer Township. There is little human activity within the catchments and some roaming cattle. Both waterways are prone to discolouration after heavy rainfalls. The Rogerson is slower to discolour and provides a more reliable base flow. However, due to the steepness of the catchment, the Dillons clears more rapidly. During periods of high turbidity, flow into the reservoir is stopped until the turbidity drops back below 4 NTU. Water is then diverted from Dillons Stream first.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 7
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
The raw water is alpine/sub-alpine and over rock/scree, so the alkalinity is naturally very low. In order to chlorinate the water, lime dosing is required to provide pH buffering. No gauging information is available for Dillons Stream and a limited amount of historical gauging information is available for the Rogerson River at the following locations (refer to Appendix A, Figure 1 for locations): • Site 1259: Rogerson River at Upstream Reservoir • Site 1265: Rogerson River at Downstream Weir • Site 1264: Rogerson River at Downstream Stoney Creek Road • Site 1263: Rogerson River at Chatterton River Confluence Flow data for these sites is included in Appendix D. The Rogerson River gauging sites located upstream of the confluence with Dillons Stream (sites 1259 and 1265) only have one gauging available at each site. Monthly gaugings were undertaken in 1987/1988 at site 1264 and this site has 13 gaugings available. The lowest flow recorded at this site is 313 L/s with a maximum recorded flow of 1,530 L/s. 27 gaugings are available at site 1263 (Rogerson River at Chatterton River Confluence) and flows at this site vary between 207 L/s and 1,519 L/s. An indication of typical natural low and mean flows in the Rogerson River at the intake and Dillons Stream at the intake can be obtained from the 7DMALF and mean flow mapping undertaken by ECan. The GIS layers for the 7DMALF isohyds (Facer, 2003) as well as the isohyds for mean flows were obtained from ECan. ECan indicated that the isohyds for both the 7DMALF and the mean flow were updated since the time the Facer (2003) report was written. Using this information the estimated natural 7DMALF and mean flow in the Rogerson River at the intake is 190 L/s and 560 L/s respectively. For Dillons Stream the estimated 7DMALF and mean flow are 110 L/s and 280 L/s respectively. It is recognised that there is some uncertainty around these estimates since they are based on regression models. However, the purpose of providing these flow statistics is to provide an indication of how the proposed take (of up to 68.3 L/s) relates to typical low and mean flows at the intake sites. The flow estimates provided above are considered appropriate for this purpose.
4.2 Existing Users and Flow and Allocation Regime in the Chatterton River ECan have indicated that the total current abstraction in the Chatterton Surface Water Allocation Zone (SWAZ) equals 40.2 L/s and has provided a list with the current allocation in the Chatterton SWAZ. This list includes the current HDC consent to take up to 18.5 L/s from the Rogerson River. There are a total of 4
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 8
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
surface water and hydraulically connected groundwater takes in the Chatterton SWAZ (refer to Table 1).
Table 1: Existing Consents in the Chatterton SWAZ
Consent number Consent Holder Activity Rate(L/s)
CRC011810.1 Mr. N D & Mrs L C Shipley Take Groundwater 1.71
CRC155109 Michael Patrick Smith Take Surface Water 10
CRC155118 Michael Patrick Smith Take Groundwater 101
CRC981514 Hurunui District Council Take Surface Water 18.5
Total 40.2
Notes:
1. Groundwater take with a direct stream depletion effect and as such included in the surface water allocation at maximum rate specified in consent. Consent CRC155109 and CRC155118 are linked to the minimum flow site for the Chatterton SWAZ and have a minimum flow of 220 L/s. The other two consents do not have minimum flow conditions. The allocation limit for the Chatterton River under the Hurunui and Waiau River Regional Plan (HWRRP) is 90 litres per second so as such there is 49.8 L/s available allocation. Should the divert, take and use consent sought under this application be granted for the proposed consent duration of 35 years then HDC will surrender consent CRC981514. HDC is applying for all the available allocation in the Chatterton SWAZ being 68.3 L/s.
5.0 Assessment of Effects Associated with the Proposal 5.1 Matters of Discretion for Take, Use and Divert of Water Rule 2.2 in the HWRRP identifies that matters for discretion are restricted for the take, use and divert component of this application. The matters for discretion are restricted to: (i) the reasonable need for the quantities of water sought and the ability of the applicant to abstract those quantities, and whether storage of water is proposed; (ii) the availability and practicality of using alternative supplies of water; (iii) the adequacy of the Water Supply Asset Management Strategy in achieving a reduction in the amount of water taken and used at times of low flow;
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 9
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
(iv) the efficiency of the exercise of the resource consent having regard to Policy 8.1; (v) the effects the take has on surface water flows, including floods, freshes and prolonging periods of low flow having regard to Policy 2.5; (vi) the effects the take has on any other authorised takes; (vii) the reduction in the rate and/or volume of water taken during times of low flow having regard to Policies 2.3 and 2.4; (viii) the collection, recording, monitoring and provision of information concerning the exercise of the resource consent having regard to Policy 8.1; (ix) the matters in Policy 1.4 and; (x) consent duration, having regard to Policies 9.1 and 9.2; Item (i), (iii), (iv), (v), (vi) are discussed in sections 5.2, 5.3, 5.6, 5.7 below. The alternatives considered (item ii) are described in Section 8.0 of this report. The matters in Policy 1.4 (item ix) are discussed in section 5.2 and 5.5 below. Item (viii) and (x) are discussed in the HWRRP Objectives and Policy assessment (section 10.5). The specific policies mentioned in the matters of discretion are also further discussed in section 10.5. It is noted that Policies 2.3 and 2.4 (and hence item vii) is not relevant as HDC has a Water Supply Asset management Strategy in place.
5.2 Effects on Water Quantity Flow variability including flushing flows are important for rivers to scour and flush periphyton and cyanobacteria accumulations, mobilise and transport bed material and trigger flow dependent aquatic life cycle processes. The FRE1.5 and FRE3 statistic is a measure of the frequency at which flushing flows occur on an annual basis. Specifically, the FRE1.5 statistic is the mean annual frequency at which the mean daily flow exceeds 1.5 times the median flow and the FRE3 statistic is the mean annual frequency at which the mean daily flow exceeds 3.0 times the median flow. Surface flushing of periphyton (and cyanobacteria) and fine sediment occurs at about 1.5 times the median flow with deep flushing and more significant bed movement occurring at around 3 times the median flow. Flushing flows control periphyton biomass because they disturb the bed of a river to such an extent that a substantial portion of the periphyton is lost from the reach due to abrasion, dislocation, and/or bed mobilisation. Clausen and Biggs (1997) found that periphyton biomass decreased with increasing flushing flows. A significant decrease in flushing flows may result in periphyton growing to nuisance levels especially in the low flow summer period (1 November – 30 April)
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 10
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENT AL EFFECTS ASSOCIATE D WITH HANMER PUBLIC WATER SUPPLY
when other factors such as water temperature and water quality are likely to be more favourable for periphyton growth. Although no median flow estimates are available for the Rogerson River the proposed take rate of 68.3 L/s is not considered to have a measurable effect on the magnitude of flushing flows, nor would it result in a sizeable reduction in the frequency of flushing flows in the Rogerson River or Dillons Stream. The take is relatively small compared to the mean flow estimates for these waterways and as such is unlikely to result in measurable reductions in flushing and flood flows. In addition it is noted that when flows are at these levels it is likely that the water supply will be shut off to avoid taking water with high sediment concentrations. At these times water is supplied to the network from the available storage. The FRE1.5 and FRE 3 statistics are also important for flow dependent aquatic life-cycle processes such as fish migration and (for the reasons outlined above) it is not anticipated that the proposed take of up to 68.3 L/s will have a significant effect on these processes. Most sediment transport in rivers occurs during freshes and floods, when flow velocities are high and sediment is supplied to the channel from runoff. As detailed above the proposed take freshes and floods are not measurably reduced as a result of the proposed take and hence it is considered that the ability of the Rogerson River and Dillons Stream to mobilise and transport bed material is maintained.
Based on the assessment above it is considered that the proposed take does not have a measurable impact on flushing flows and flow variability in the Rogerson River and Dillons Stream. The proposed take is very small compared to the flushing flows and flood flows required to scour and flush periphyton and cyanobacteria accumulation, mobilise and transport bed material and trigger flow dependent aquatic life-cycle processes such as fish migration. As detailed in Section 5.2 typical low flows in the Rogerson River and Dillons Stream are around 190 L/s and 110 L/s respectively. Although no gauging information is available for the Dillons River there is the possibility that Dillons Stream may have less than 68.3 L/s at times of extreme low flows. Therefore there is a small chance that if the full flow rate of up to 68.3 L/s is taken from Dillons Stream at times of extremely low flows the stream bed may be dry below the point of take. Therefore conditions are proposed to ensure that the proposed abstraction does not induce the stream to go dry immediately below the point of take in Dillons Stream. This is not considered to be an issue for the Rogerson River and as such it is proposed that at times of low flow the take rate from Dillons Stream is reduced (refer to proposed consent conditions). At these times the rate of take from Dillons Stream is reduced to a maximum of 34 L/s. It is also noted that at these
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 11
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
times measures will be in place (as detailed in the water supply asset management strategy) that will reduce the amount of take (refer to section 5.7 for more details). 5.3 Effects on Existing Users As discussed in Section 4.2 there are a total of 4 surface water and hydraulically connected groundwater takes which are considered to be part of the Chatterton River allocation under the HWRRP. The consent application to divert, take and use up to 68.3 litres per second will fully allocate the Chatterton SWAZ. The taking of water has the potential to adversely affect the reliability of supply for existing users. However, in this case the effect from the proposed activity on existing users is considered to be less than minor. The main reason for this is that the effect on existing users will be no greater than that already anticipated when the allocation limit for the Chatterton SWAZ was set for the HWRRP. As noted earlier, this abstraction will continue to provide a human drinking water supply. This abstraction is used to provide a registered drinking water supply for Hanmer Springs. In relation to drinking water, NES Regulation 4 (1) defines health water quality criteria being met when drinking water is – (a) Tested for determinands- i. At the point where the drinking water leaves the treatment process concerned but has not yet entered the distribution system concerned; or ii. At some point in the distribution system, if any particular determinand is not tested at the point referred to in subparagraph (i); and (b) Is tested in accordance with the compliance monitoring requirements in the Drinking-water Standard ; and (c) When analysed, does not contain or exhibit one or more determinands exceeding their maximum acceptable values for more than the allowable number of times as set out in table A1.3 in Appendix 1 of the Drinking- water Standard. This application seeks a new consent to replace consent CRC981514 and to add the take of water from Dillons Stream (which used to be authorised under consent CRC000283). HDC has continued to abstract and use water from both the Rogerson River and Dillons Stream and consequently, this water supply was part of the regular water quality testing carried out in accordance with the drinking water standard. HDC routinely samples the water in order to comply with the drinking water standards. HDC has indicated that the health water quality criteria for the water supply are met.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 12
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER S UPPLY
In summary this application does not seek to change the supply of water to the scheme, but rather seeks authorisation to continue the abstraction (and increase the rate of take into the future). Therefore it is expected that the health water quality criteria for the water supply will continue to be met if consented. Abstractions for a water supply may have a potential indirect effect on the drinking water quality within the network. For example a flood event may cause large amounts of suspended sediment to enter the network. Online turbidity sensors close the takes during events which cause an increase in sediment so no water will be abstracted during times of high flow. When water is taken most of the suspended sediment in the water will drop out of suspension in the settlement pond and main storage reservoir. It is also noted that it is proposed to maintain the diversion of flow through the open reservoir and discharging of water back to the Rogerson River via an overflow weir. As previously indicated this is to maintain sufficient throughflow in the reservoirs in order to prevent algae growth (especially in spring/summer).
5.4 Effects on Water Quality A reduction in flow variability as a result of a large abstraction has the potential to have an adverse effect on water quality. For example, a large reduction in flushing flows may increase the risk of periphyton/ cyanobacteria accumulations in the river. As discussed in Section 5.2, it is considered that there is no measurable effect on flow variability in the Rogerson River and Dillons Stream as a result of the proposed take and hence the water quality in these waterways is not affected. The quality of the water discharged back into the Rogerson River will be the same/similar to the water abstracted from either the Rogerson River or Dillons Stream. It is therefore considered that the discharge of water will have no adverse effect on downstream water quality. If anything, routing the water through the settlement pond and main reservoir will reduce the suspended sediment concentration in the water. A search of Canterbury Maps (ECan GIS system) showed no surface water quality monitoring sites on the Rogerson River or Dillons Creek.
5.5 Effects on Fish Passage The New Zealand Freshwater Fish Database (NZFFD) was searched for fish records within the Rogersons River and the Dillions Stream catchments. According to the NZFFD, a recent survey of the fish community in the Rogerson River was undertaken in 2009. Two species of native fish were identified, one is ranked as ‘at risk – declining’ (Galaxias Vulgaris (Canterbury galaxias)) and one is ranked as ‘not threatened’ (Gobiomorphus breviceps (Upland bully)) by Dunn et al. (2017). Additional to the native fish species identified are the native
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 13
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
freshwater crayfish/kōura (Paranephrops spp.), freshwater mussel/Kākahi (Hyridella menziesi) and the freshwater shrimp (Paratya curvirostris) which are also recorded from within the Rogerson River. Of these species the Kākahi is known to be under threat/declining. Although there were no records of salmonids in the NZFFD for the Rogerson River and Dillions Stream, it is likely that salmonids (particularly trout) will inhabit these streams as they are known to be in the wider catchment. None of the identified species are diadromous (i.e. require sea to freshwater migration to complete their lifecycle), upstream downstream movement will still occur, as fish are highly mobile. It is therefore important to maintain fish passage within the affected waterways. Abstracting water at low flow may affect fish passage. The required water depth for fish passage is 150 mm for native species and 250 mm for salmonids (Franklin et. al. 2018). There is limited data available on water depth at different flows in the Rogerson River and no data is available for Dillons Stream. Gauging data provided by ECan for the sites listed in Appendix D indicates that the maximum water depth at site 1259 (Rogerson River at upstream weir) was 230 mm at a flow of 192 L/s (which is similar to the 7D MALF for this site). For site 1265 (Rogerson River at downstream weir) the maximum water depth was 310 mm at a flow of 576 L/s (which is similar to the mean flow estimate for this site). Water depth at site 1264 (Rogerson River at downstream Stoney Creek Road) varied between 290 mm and 460 mm for flows between 313 L/s and 1,530 L/s (13 gaugings). For site 1263 (Rogerson River at Chatterton Confluence) water depth varied between 240 mm and 560 mm over a flow range of 207 L/s to 1,519 L/s (27 gaugings). Inspection of the available data indicates that (generally speaking) the abstraction of up to 68.3 L/s of water makes little difference in terms of water depth. It does appear that at times of (extreme) low flow water depth could be less than 250 mm. At times when the water depth is low salmonid fish passage may be marginal under natural conditions. In summary, the proposed abstraction is likely to result in a small reduction in flow and water depth. However, for the vast majority of the time fish passage is maintained and during times of low flow mitigation measures will be implemented (reduction of water use) to reduce the amount of take (and hence reduction in downstream water depth). With the proposed mitigation measures in place it is considered that the effect on fish passage is less than minor.
5.6 Reasonable and Efficient Use The gravity supply (from both Dillons Stream and Rogerson River) is self- regulating. Flow into the tanks is controlled through an electric on/off valve, which is open fully when the tanks reach 2/3 full and closes again when the tanks
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 14
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
are full. Flow out of the tanks is determined by demand. These automatic controls in the design and operation of the network will minimise wastage in the network while also ensuring that water is only taken when required to meet demand. The water demand management section of HDC’s asset management plan provides further details which improvements and steps are undertaken to ensure that leakage/wastage is avoided (refer to Appendix C). As detailed in the Hurunui Tourism Strategy 2017-2022 (Hurunui Tourism Board, 2017) tourism in the Hurunui District is primarily centred on the thermal waters in Hanmer Springs which have been attracting visitors for a long time. The Hanmer Springs Thermal Pools and Spa attracts more than half a million visitors annually and has cemented its place as New Zealand’s alpine spa village and as one of the country’s favourite tourism destinations. As detailed in Section 2.0 HDC wishes to future proof the scheme by allowing for an increase in demand over the consent duration sought (35 years). The quantity of water sought for this consent application is 68.3 L/s (around 5,900 m3/day). As previously indicated water demand varies greatly and, although this application is for 68.3 L/s it is noted that outside the peak (tourist) season it can be expected that the demand will be lower than this. As indicated in Section 2.0, current daily demand over the peak period can be up to 2,400 m3/day (mean daily flow rate of around 28 L/s). The New Zealand Tourism Forecast for 2018-2024 (Ministry of Business, Innovation & Employment, 2018) forecasts an increase in international visitor arrivals to New Zealand of 4.6 per cent per year. Although there is some uncertainty associated with forecasting international visitor arrivals (especially for the 35 year consent duration sought) using a 4.6 growth in water use per annum would result in a peak water demand of 135 L/s in 2053. It is noted that the growth in international visitor arrivals to New Zealand over the last 35 years has been much greater than that at approximately 6 percent per annum. Irrespective of these considerations HDC has decided to apply for a flow rate less than what may be required over the 35 year consent duration and apply for up to 68.3 L/s which is the current available allocation in the Chatterton SWAZ. In line with the requirements of the HWRRP it is proposed to meter and telemeter the proposed take from the Rogerson River and Dillons Stream.
Based on these factors it is considered that the quantities of water sought are reasonable and that the proposed water use is efficient. 5.7 Water Supply Asset Management Strategy In accordance with the definition of a water supply asset management strategy in the HWRRP a strategy has been prepared which describes how water usage will
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 15
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENV IRONMENTAL EFFECTS A S S O C I A T E D W I T H H A N M E R PUBLIC WATER SUPPL Y
be reduced at times of low flow to ensure that no more than 250 Litres of water is provided to each person per day. A copy of the water supply asset management strategy for the Hanmer water supply is included in Appendix C. Measures to reduce the rate of take are implemented when the flow in the surface water body is at or below the minimum flow for the Chatterton SWAZ. For the Chatterton SWAZ these measures are required when the flow in the Chatterton River falls below 220 L/s and/or when the Waiau River (at Marble Point) falls below the minimum flow for A permits (20 m3/s).
5.8 Effects on Tangata Whenua Values While not listed as a matter for discretion under Rule 2.2 a review of the area has found that the Papatipu Runanga in which the proposed activity will occur is Te Rūnanga o Kaikōura, and also Te Ngai Tuahuriri Runanga. The location of the surface water take is not located on or nearby any Silent File Areas, as shown on the ECan GIS database. Similarly, the proposed activity does not occur within a Statutory Acknowledgement Area. The relevant iwi management plan for the proposed surface water take and use is the Te Poha o Tohu Raumati and Mahaanui Iwi Management Plan. Further discussion on how the proposal is consistent with the policies contained in these plans can be found in Section 10.6.2 of this report.
5.9 Potential Benefits of the Activity The proposed HDC water abstraction subject of this application is directly linked with the development of Hanmer Springs Township and Thermal Pools. Hanmer Springs is a key tourist destination in New Zealand and is important for the economic development of the Hurunui district. One of the factors for further development of both the thermal pools and township depends on the supply of freshwater from the Hanmer Springs public water supply.
6.0 Compliance with Drinking Water NES The Rogerson River and Dillons Stream water supply currently provides human drinking water supply for Hanmer Springs and is identified on the Drinking Water Supplies Register as a minor supply. Regulation 7, 8 and 10 of the NES are not applicable to this application. Regulation 12 is relevant as the supply serves more than 25 people for more than 60 days per calendar year. Regulation 12 (1) states that when considering a resource consent application, the consent authority must consider whether the activity may: (a) itself lead to an event occurring that may have a significant adverse effect on the quality of water at the abstraction point; or
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 16
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
(b) as a consequence of an event, have a significant adverse effect on the quality of water at the abstraction point. In the case of this consent application the abstraction itself will not result in an adverse effect on the quality of water used for a human drinking supply.
7.0 Mitigation Measures As detailed in section 5.7 a water supply asset management strategy has been prepared for the Hanmer water supply (Copy included in Appendix C). This strategy sets out measures to reduce the rate of take during times of low flow, which will mitigate the effect the take may have on flow and water levels during critical low flow periods. In addition it is proposed to take a maximum of 34 L/s (approximately half of the proposed maximum flow rate) from Dillons Stream when flows at the minimum flow site in the Chatterton are below the minimum flow. Although unlikely this is to ensure that the reach of the Chatterton between the point of take and the confluence with the Rogerson River will not go dry in the unlikely event that natural flows in Dillons Stream are at or below 68.3 L/s.
8.0 Consultation The proposed divert, take and use and discharge of water was discussed with ECan staff prior to preparing this application. The available amount of surface water allocation in the Chatterton SWAZ was discussed and confirmed by Rachel Sare. The activity status of the proposed activity was discussed with ECan planning staff (David Birch and David Just). Mahaanui Kurataiao Limited (MKT) is facilitating the consultation process on behalf of local Runanga. HDC has briefly discussed the application with David Holliday from (MKT) and the application will be forwarded to MKT. The application will be forwarded to the landowners within the area covered by the proposed drinking water protection zone and the take locations.
9.0 Consideration of alternatives Alternative supply catchments have been considered in the past (For example Dog Stream that passes through Hanmer Springs urban area). These alternative supplies were either too small to maintain good summer flows, have a higher incidence of human activity associated or require considerable pumping to deliver water to town. Groundwater was investigated in 1997, with a 160 m deep bore located along SH7A, at the start of the 50 km zone for the town. Water was found, but contained high levels of chloride, sulphides and metals – probably originating from nearby geothermal influences.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 17
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
The gravity supply from the Rogerson and Dillons catchments are considered to provide the most reliable source of water in the area.
10.0 Section 104 matters 10.1 Matters to be Considered Section 104 of the RMA states: (1) Subject to Part II, when considering an application for a resource consent and any submissions received, the consent authority shall have regard to:- (a) Any actual and potential effects on the environment of allowing the activity; (b) Any relevant provisions of – i. a national environmental standard; ii. other regulations; iii. a national policy statement; iv. a New Zealand coastal policy statement; v. a regional policy statement or proposed regional policy statement;
vi. a plan or proposed plan; and (c) Any other matter the consent authority considers relevant and reasonably necessary to determine the application. Actual and potential effects have been considered in Section 5.0 of this report. The following sections consider the relevant national environmental standards, the National Policy Statement for Freshwater Management, the Canterbury Regional Policy Statement and the relevant regional plans. It is noted that the NZ Coastal Policy is not relevant. Additionally, there are no Water Conservation Orders or Draft Water Conservation Orders or Heritage Orders relevant to this application. Other matters (c) which may be considered relevant to this application include the Iwi Management Plans (Section 10.6) and the Canterbury Water Management Strategy (see Section 10.7).
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 18
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
10.2 National Environmental Standards
10.2.1 NES for Sources of Human Drinking Water The purpose of the NES for Human Drinking Water is to reduce the risk of human drinking water source becoming contaminated. These regulations came into effect on 20 June 2008. These regulations apply to applications for water permits or discharge permits which have the potential to affect a registered drinking water supply. This application is seeking consent to divert, take, use and discharge water for a community water supply and this activity will not adversely affect the quality of any registered drinking water supplies located downstream.
10.2.2 NES for Measurements and Reporting of Water Takes The purpose of the NES for Measurement and Reporting of Water Takes is to accurately measure and record water takes so that water resources can be effectively allocated and efficiently used. The regulations came into effect on 10 November 2010. Water metering conditions are proposed and as such it is considered that the proposal is in line with the NES for measurement and Reporting of Water Takes.
10.2.3 NES for Ecological Flows and Water Levels The proposed National Environmental Standard on Ecological Flows and Water Levels (2008) is currently on-hold pending decisions on the Government’s freshwater reform programme, and as such this proposed NES is not considered relevant to this application. 10.3 National Policy Statement for Freshwater Management This National Policy Statement for Freshwater Management (NPS-FM) sets objectives and policies to direct local government to manage water in an integrated and sustainable way, simultaneously maintaining economic growth within water quantity and quality limits. Part A addresses water quality and Part B addresses water. The purpose of this application is to take and use water for a community water supply and as such will contribute towards future economic growth. The abstraction from the Rogerson River and Dillons Stream will occur within the water quantity and quality limits as specified in the HWRRP and is considered to be efficient. It is therefore considered that this application is in general accordance with the NPS-FM.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 19
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
10.4 Canterbury Regional Policy Statement 2013 The Canterbury Regional Policy Statement (CRPS) provides an overview of the resource management issues specific to the Canterbury region. Within CRPS are the objectives, policies and methods to achieve integrated management of natural and physical resources for Canterbury. Chapter 7 Fresh Water aims to maintain fresh water standards and methods for improvement. This chapter is directly related to the activity proposed under this application.
Objective 7.2.1 aims to have the region’s freshwater resources managed sustainably to enable people and communities to provide for their social- wellbeing through abstracting and/or using water providing that (1) the life- supporting capacity of fresh water is safe-guarded and (3) any actual or reasonably foreseeable requirements for community are provided for. Objective 7.2.2 recognises parallel processes for managing water and states that the abstraction of water and development of water infrastructure in the region occurs in parallel with (1) improvements in the efficiency with which water is allocated for abstraction, the water it is abstracted and conveyed, and its application or use; and (2) the maintenance of water quality where it is of a high standard. Objective 7.2.3 states that the overall quality of freshwater in the region is to be maintained or improved and its life supporting capacity be safeguarded.
Objective 7.2.4 promotes the integrated management of freshwater resources and aims to sustainably manage the resource within and across catchments, between activities and between agencies and people with interests in water management in the community. Policy 7.3.4 addresses water quantity and states that the abstraction of surface water be managed by establishing environmental flow regimes and water allocation regimes. Policy 7.3.6 is to establish and implement minimum water quality standards for surface water and groundwater resources in the region, which are appropriate for each water body. Policy 7.3.8 aims to improve the efficiency in the allocation and use of freshwater by ensuring that the infrastructure used to reticulate and apply water is highly efficient for any new take. Policy 7.3.9 seeks to require integrated solutions to the management of fresh water by developing and implementing comprehensive management plans which address the policies of the CRPS.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 20
HURUNUI DISTRICT COU NCIL - ASSESSMEN T OF ENVIRONMENTAL E FFECTS ASSOCIATED WITH HANMER PUBLIC W ATE R S U P P L Y
HDC have identified future demand for drinking water and the need to abstract surface water to future proof their drinking water supply. The water take from the Rogerson River and Dillons Stream is efficient and is within the surface water limits for the Chatterton SWAZ. This proposal to divert, take, use and discharge water to allow for the use of water for drinking water purposes is consistent with the relevant objectives and policies contained in the CRPS. 10.5 Hurunui Waiau River Regional Plan Section 104 of the RMA requires that the consent authority have regard to relevant objectives, policies, rules or other provisions or a plan or proposed plan. The relevant plan is the HWRRP. Among the matters for discretion for Rule 2.2 is consideration of the following policies within the HWRRP: Policies 1.4, 2.3, 2.4, 2.5, 8.1, 9.1, 9.2. The following section discusses the activity in the context of these policies. Policy 1.4 seeks to provide for the sustainable development of communities provided that the abstraction will not induce the river to go dry, the frequency of flow events between 1.5 and 3 times the median flow will not be reduced and that native and salmonid passage will not be compromised. As discussed in Section 5.2 (with the proposed reduced rate of take from Dillons Stream at times of low flow) it is considered that the activity does not induce the Rogerson River or Dillons Stream to go dry. Furthermore, as discussed in that section, it is considered that there is no sizeable reduction in the frequency of flow events between 1.5 and 3 times the median flow. The effects on fish passage are discussed in Section 5.5. The proposed take will result in only a small reduction in water depth and fish passage will be maintained for the vast majority of the time. As such it is considered that fish passage will not be compromised. In addition the water supply asset management strategy will reduce the amount of water taken during times of low flow to minimise the effects of the proposed take during critical low flow periods in both the Rogerson River and Dillons Stream. Policy 2.3 applies to takes and diversions on the main stem of the Waiau and Hurunui Rivers, and therefore is not applicable. Policy 2.4 applies to all takes and diversions on tributaries of the Hurunui and Waiau Rivers, where a specific allocation limit is listed in the Environmental Flow and Allocation Regime in Table 1. This policy requires the reduction of the amount of water taken on a pro-rata basis to ensure that the minimum flow for that tributary is not breached. This policy does not apply to a community or stock drinking water supply where there is a Water Supply Asset Management Strategy in place. As stated earlier, the take is for a community and stockwater
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 21
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
supply and a Water Supply Asset Management Strategy will be implemented for the water supply network. Policy 2.5 aims to ensure that any take of water provides for flow variability above the minimum flow to scour and flush periphyton and cyanobacteria accumulations, mobilise and transport bed material, trigger flow dependent aquatic life-cycle processes, and provide for recreational values in the mainstem of the Hurunui and Waiau rivers. Section 5.2 discusses flow variability, including the flows between 1.5 and 3 times the median flow. As concluded in that discussion, the proposed take does not have a measurable impact on the flushing flows and flood flows required to scour and flush periphyton and cyanobacteria accumulation, mobilise and transport bed material and trigger flow dependent aquatic life-cycle processes such as fish migration. Finally, while the abstraction is not on the mainstem of the Waiau River, the abstraction as proposed will not have an adverse effect on the recreational values and activities on the main stem of the Waiau River as the proposed take is negligible compared to the flows in the Waiau River. It is for these reasons, the proposed abstraction is consistent with Policy 2.5. Policy 8.1 aims to maximise the efficiency in the taking and use of water in the Waiau River catchment. Policy 8.1(a) is achieved in this proposal as HDC has demand management strategies in place which aim to minimise leakage in the design and operation of the infrastructure (refer to Section 5.6 Reasonable Use and Efficiency and Appendix C). Policy 8.1 (d) is met as the take will be metered and the recorded data will be telemetered. Policy 8.1(e) states that resource consents to take are for a specified use and that the rate and volume of abstraction are reasonable for the intended use in accordance with Policy WQN16 of the NRRP (contained in the HWRRP as Schedule 4). The use of the water is for a community water supply, and the rate and volume of the abstraction have been determined as discussed in Section 2.0 and Section 5.6 of this report. Policy WQN16(1) applies to all water permit applications to take, divert and use water, and seeks to ensure only the amount of water needed for the efficient operation of each activity is taken. This application proposes conditions which provide the instantaneous rate of abstraction, and daily volume, and these figures are based on anticipated community needs. It is recognised that WQN 16(1) specifically asks for the return period and annual volume, however both return period and annual volume typically relate to irrigation takes and not to a community water supply. The maximum instantaneous rate and daily volume proposed for this application ensure that the take rate and volume are
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 22
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D W I T H H A N M E R PUBLIC WATER SUPPL Y
reasonable for the intended end use. The management of the supply includes measures to ensure that significant wastage of water is avoided. As discussed in Section 5.4 of this report, the adverse effect on water quality are avoided to meet the requirements of relevant water quality policies in Chapter 4 of the NRRP. Policies WQN16(2)-WQN16(7) and WQN16(13) apply to irrigation activities and are not relevant to this application. Policies WQN16(11) applies to stock water races and is therefore not directly relevant to this application.
Policy WQN16(12) encourages the supplies of stockwater and community drinking water supplies to take all reasonable steps to progressively upgrade reticulated systems where there is a significant amount of leakage. As detailed in Section 5.6 automatic controls in the design and operation of the network minimise wastage in the network while also ensuring that water is only taken when required to meet demand. As the HDC supply is a piped supply without a significant amount of leakage it is considered that this policy has been achieved, and therefore is not directly relevant to this application. When carried out with the proposed consent conditions, the take and use is consistent with the relevant policies contained in Policy WQN16 and is a reasonable and efficient use of water. Policy 9.1 seeks to generally limit the term of resource consents to take and use water within the Hurunui catchments to 10 years and to initial common catchment expiry date of 1 January 2025. This policy also applies to replacement of expired consents. Section 1.4.1 of the HWRRP (p6) discusses its approach to community and/or stock drinking water supplies. It states: “This Plan takes a different approach, and: • Explicitly provides for the continuation and reasonable expansion of community and/or stock water schemes as long as the life supporting capacity of the river is provided for.” This suggests that a longer term consent duration beyond 10 years is acceptable for this proposed application. In addition it is noted that Hanmer Springs attracts more than half a million visitors annually and is one of New Zealand’s favourite tourism destinations (refer to Section 5.6). It is therefore critical that long term security will be provided to the drinking water supply of Hanmer allowing for anticipated growth. It is also noted that should the consent be granted for a shorter period (and a lesser flow rate and volume) there is a significant risk that no water will be available from the Chatterton SWAZ when the consent is up for renewal. With no alternative water supply available (refer to Section 8.0) this
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 23
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
provides a significant risk to the public water supply of Hanmer Springs going into the future. Policy 9.2 recognises the regional significance of applications for hydro-electric generation, large scale water storage and large scale irrigation infrastructure with capital costs greater than $10 million dollars by providing for a consent duration of up to 35 years. This policy does not apply as the proposal is for a public water supply. As discussed above, the proposed take and use of water, when carried out in accordance with the proposed consent conditions, is consistent with the relevant policies referenced in Rule 2.2. There is one relevant Policy in the HWRRP related to the proposed discharge of water in the HWRRP. Policy 3.6 aims to enable water to be discharged from non-consumptive activities to the Waiau and Hurunui rivers and their tributaries provided the following is maintained downstream of the point of take: (a) sufficient invertebrate production to support fish and river bird communities; (b) habitat and fish passage for native fish, salmon and trout; (c) the health and safety of people and communities using the river; and (d) the water is returned to the river in the same or better state and quality. As detailed in Section 5.4 the quality of the water discharged back into the Rogerson River will be the same/ similar to the water abstracted from either the Rogerson River or Dillons Stream. It is therefore considered that none of the items mentioned above are affected and it is therefore considered that the proposed activity is consistent with this Policy.
10.6 Iwi Management Plans The following iwi management plans are relevant to this application:
• Ngai Tahu Freshwater Policy Statement; and
• Te Poha o Tohu Raumati; and
• Mahaanui Iwi Management Plan The proposal has been considered against the relevant objectives and policies contained in these iwi management plans.
10.6.1 Ngai Tahu Freshwater Policy Statement The focus of the Freshwater Policy Statement is the management of freshwater resources within the rohe of Ngai Tahu. It outlines the environmental outcomes
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 24
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
sought by Ngai Tahu and the means by which Ngai Tahu is seeking to work with resource management agencies to achieve these outcomes. The primary focus of the surface water component of this policy is on the protection of instream values. Given that the divert, take and use of water is within the water quantity limits set in the HWRRP it is considered that this application is not contrary to the policies contained this Freshwater Policy Statement. The proposed quality of the water discharged back into the Rogerson River is of the same quality as the water taken from the Rogerson River/Dillons Stream and as such the discharge is also considered to be consistent with the policies contained in this Policy Statement.
10.6.2 Te Poha o Tohu Raumati Te Poha o Tohu Raumati, the Te Rūnanga o Kaikōura Environmental Management Plan, was developed by Te Rūnanga o Kaikōura. The plan provides a framework for the Rūnanga to effectively apply tangata whenua values and policies to natural resource and environmental management in the takiwā. The plan was first released in 2005, with the current 3rd edition released in October 2009. Chapter 3.5 Okarahia ki te Hurunui covers the area defined as Okarahia ki te Hurunui which covers the Waiau Catchment (including the Chatterton River catchment). Policy 3.5.8.1 requires that all applications for surface water abstraction in this area are forwarded to Te Rūnanga o Kaikōura in full. The application is being submitted to ECan, and as such will be reviewed by the ECan Iwi Liaison officer prior to any decision on the application being made. Policy 3.5.8.4 require that new applications for surface water abstractions be considered in terms of cumulative effects of all existing water takes, impacts on water quality, mahinga kai and other instream values. These matters have been addressed in Section 5.0 of this report. Policy 3.5.8.5 promote the setting of limits that identify the maximum amount of water that can be taken from a given area to be used for irrigation or other specific activities. Limits have been set for the Chatterton SWAZ in the HWRRP and this application is within the limits set. Policy 3.5.8.11 and 3.5.8.19 and 3.5.8.20 encourage the installation of appropriate measuring devices (e.g. water meters) on all existing and future water abstractions and require robust monitoring of water permits. Consent conditions are proposed to monitor the take of water. The Policies in section 3.5.9 and 3.5.10 and 3.5.11 of Te Poha o Tohu Raumati relate to flow management regimes and water quality. These matters have been discussed in section 4.2 and 5.4of this report.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 25
HURUNUI DISTRICT COU NCIL - A SSESSMENT OF ENVIRON MENTAL EFFECTS ASSOC I A T E D WITH HANMER PU BLIC WATER SUPPLY
Policy 3.5.13.26 seeks to ensure that activities in the upper catchment have no adverse effect on mahinga kai, water quality and water quantity in the lower catchment. These matters have been discussed in section 5.2, 5.4 and 5.8 of the report. Overall, the proposed activity is consistent with the relevant policies within the Te Poha o Tohu Raumati plan, and therefore will not adversely affect Tangata whenua values.
10.6.3 Mahaanui Iwi Management Plan The MIMP provides a statement of Ngāi Tahu objectives, issues and policies for natural resource and environmental management in most of the Canterbury Region, from the Hurunui River to the Hakatere River. In that context it must be noted that this is a high level policy document. It is primarily aimed at informing strategic planning in terms of the promulgation of regional and district planning documents, as opposed to guiding assessment of individual resource consent applications. Part 5 sets out the Regional Issues and Policy relevant to this application, being those relating to Ranginui (Air), Wai Maori (Water) and Papatūānuku (Land). i. Wai Maori (Water) Ngā Paetae Objectives (2) Water quality and quantity in groundwater and surface water resources in the takiwā enables customary use mō tātou, ā, mō kā uri ā muri ake nei. (3) Water and land are managed as interrelated resources embracing the practice of Ki Uta Ki Tai, which recognises the connection between land, groundwater, surface water and coastal waters. The proposal balances the demand for a community water supply in a way that considers the current demand while also considering the potential impacts on future generations. There is potential for adverse effects however those are considered less than minor in the context of the existing environment. The application site is not identified on Canterbury maps as an area of cultural significance. For the reasons set out above the proposal is not considered contrary to resource management outcomes sought by the MIMP.
10.7 Canterbury Water Management Strategy The CWMS was notified in November 2009 and was developed to help manage Canterbury’s water resources, as they are deemed vitally important to the region and to the nation. Lakes, rivers, streams and aquifers are used for hydro electricity generation, agricultural production and drinking water, as well as for a range of customary and recreational uses. The desired outcome of the CWMS is:
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 26
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
“To enable present and future generations to gain the greatest social, economic, recreational and cultural benefit from our water resources within an environmentally sustainable framework.” This vision includes the outcome that water users will have reliable access to water. In achieving this vision there are fundamental principles that have been developed to underpin the strategy. These include setting priorities for the use of water. The application seeks to divert, take, use and discharge water from the Rogerson River and Dillons Stream for the Hanmer Springs public water supply, and the assessment of effects has demonstrated that this can be achieved and that the effects on the environment are less than minor. The assessments undertaken indicate that other existing users are not affected. As such, this application to divert, take, use and discharge water is consistent with the vision and principles contained in the CWMS. 10.8 Section 104D (1)Despite any decision made for the purpose of notification in relation to adverse effects, a consent authority may grant a resource consent for a non-complying activity only if it is satisfied that either— (a)the adverse effects of the activity on the environment (other than any effect to which section 104(3)(a)(ii) applies) will be minor; or (b)the application is for an activity that will not be contrary to the objectives and policies of— (i)the relevant plan, if there is a plan but no proposed plan in respect of the activity; or (ii)the relevant proposed plan, if there is a proposed plan but no relevant plan in respect of the activity; or (iii)both the relevant plan and the relevant proposed plan, if there is both a plan and a proposed plan in respect of the activity. (2)To avoid doubt, section 104(2) applies to the determination of an application for a non-complying activity.
This assessment of effects has shown that any adverse effects of the proposal will be no more than minor and the proposal is consistent with the relevant Objectives and Policies. On that basis it is considered that consent can be granted to the proposal.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 27
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER PUBLIC WAT E R S U P P L Y
11.0 Restrictions on Granting of Discharge Consents Section 107 of the Act sets out restrictions on the granting of discharge permits under Section 15, which may result in a contaminant entering water. Section 107(1) states that the consent authority shall not grant resource consent if, after reasonable mixing, the contaminant or water discharged gives rise to: (c) the production of any conspicuous oil or grease films…or suspended materials; (d) any conspicuous change in colour or visual clarity; or (e) any emission of objectionable odour; or (g) any significant adverse effects to aquatic life. As discussed in Section 5.4 of this report, it is anticipated that the proposed water discharge is not expected to give rise to any of these effects as the water quality of the discharge will be the same/similar to that taken from the Rogerson River and/or Dillons Stream.
12.0 Part II Purpose and Principles
12.1 Purpose of the Act – Section 5 The purpose of the Act is to promote the sustainable management of natural and physical resources. Sustainable management means managing the use, development and protection of natural and physical resources in a way, or at a rate, which enables people and communities to provide for the social, economic and cultural well-being and for their health and safety while - (a) Sustaining the potential of natural and physical resources to meet the reasonably foreseeable needs of future generations; and (b) Safeguarding the life-supporting capacity of air, water, soil and ecosystems: and (c) Avoiding, remedying or mitigating any adverse effects on activities on the environment. Recent case law1 has directed when decision making should employ “an overall broad judgement” in respect of resource consent applications. As found by the Court of Appeal, it would be “appropriate and necessary” to refer to Part 2 when considering consent applications, but only where there is doubt that a plan has been “competently prepared” under the RMA. It is considered that in this particular case, the LWRP is sufficiently competent and is considered to have already given effect to Part 2. Accordingly, Part 2 matters are adequately
1 ‘[2018] NZCA 316 - CoA Decision’
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 28
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
addressed by these lower order documents which are included in the s104 assessment. The proposal is demonstrably consistent with these lower order documents and as such, referring back to Part 2 potentially wouldn’t "add anything to the evaluative exercise". Section 5.0 of this report indicates that this consent to allow the taking and using of surface water from the Rogerson River and Dillons Stream for the Hanmer public water supply represents sustainable management. Further, the activity, when carried out in accordance with the proposed consent conditions safeguards the life-supporting capacity of air, water, soil and ecosystems. The adverse effects on the environment of the proposed activity have been avoided, remedied or mitigated. However for completeness an assessment of Part 2 is included in this application, even though the overall status of the proposed activity is Restricted Discretionary. 12.2 Matters of National Importance – Section 6 Section 6 outlines matters of national importance that are to be recognised and provided for in achieving the purpose of the Act. These matters of national importance are: (a) the preservation of the natural character of the coastal environment, wetlands, and lakes and rivers and their margins, and the protection of them from inappropriate subdivision, use and development; (b) the protection of outstanding natural features and landscapes from inappropriate subdivision, use and development; (c) the protection of areas of significant indigenous vegetation and significant habitats of indigenous fauna; (d) the maintenance and enhancement of public access to and along coastal marine areas, lakes and rivers; (e) the relationship of Maori, their culture and traditions with their ancestral lands, water, sites, waahi tapu, and other taonga; (f) the protection of historic heritage from inappropriate subdivision, use and development; (g) the protection of protected customary rights. The matters of national importance relevant to this application are (a) and (e). In the context of this proposal all of the relevant matters in Section 6 have been addressed.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 29
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
12.3 Other Matters – Section 7 Section 7 of the Act sets out those matters that have particular regard attributed to them in achieving the purpose of the Act. Those matters are as follows: (a) Kaitiakitanga; (aa) The ethic of stewardship; (b) The efficient use and development of natural and physical resources; (ba) The efficiency of the end use of energy; (c) The maintenance and enhancement of amenity values; (d) Intrinsic values of ecosystems; (e) [Repealed]; (f) Maintenance and enhancement of the quality of the environment; (g) Any finite characteristics of natural and physical resources; (h) The protection of the habitat of trout and salmon; (i) The effects of climate change; (j) The benefits to be derived from the use and development of renewable energy.
Relevant to this proposal are (a), (b), (d),(f) and (g). As demonstrated in Section 5.0 of this report and when carried out in accordance with the proposed consent conditions, the potential adverse effects on the environment arising from the proposed activity are less than minor. It is considered that these matters have been adequately taken into account.
12.4 The Principles of the Treaty of Waitangi Section 8 requires the principles of the Treaty of Waitangi to be taken into account, including the cultural values derived from water quantity and quality, as well as soil and air quality. It is considered that the proposal is consistent with Part II and section 8 of the RMA. The proposed activity fits within those issues identified in the relevant planning documents and is considered to give effect to the Principles of the Treaty of Waitangi.
13.0 Notification Consideration has been given to what the potential notification status of the application is likely to be; ultimately this is a decision for the consenting authority and may be impacted by matters that arise after submission of this
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 30
HURUNUI DISTRICT COUNCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
application. Notification is assessed under section 95 of the RMA. Public notification has not been requested nor is it considered mandatory or specifically precluded. Limited notification is neither mandatory nor precluded. It is considered that any adverse effects of the proposal are no more than minor and that no party is adversely affected. On that basis, and the assessment contained within this AEE, it is considered that the application can be processed on a non- notified basis.
14.0 Proposed Consent Conditions The Applicant proposes to divert, take and use water from the Rogerson River and Dillons Stream under the following conditions: General 1. Water shall only be diverted from the Rogerson River at surface water abstraction point (SWAP) N32/0358 at or about map reference NZTM2000: 1582082 mE 5293322 mN and from three galleries at or about map reference NZTM2000: 1582445 mE 5293625 mN and from Dillons Stream at surface water abstraction point (SWAP) BU24/0009 at or about map reference NZTM2000:1582440 mE 5293619 mN. 2. The rate at which water is diverted from either the Rogerson River or Dillons Stream shall not exceed 68.3 litres per second. The maximum combined rate of diversion from the Rogerson River or Dillons Stream shall not exceed 68.3 litres per second. 3. The rate at which water is taken shall not exceed 68.3 litres per second, with a volume not exceeding 5,900 cubic metres per day. 4. Water will be used for the community water supply within the Hanmer Water Supply Network. 5. Whenever the flow in the Chatterton River at downstream of take at or about map reference NZTM 2000: 1584582 mE 5292307 mN falls below 220 L/s the maximum rate of take from Dillons Stream shall be 34 L/s. 6. Water restrictions for the users of the Hanmer Springs Water Supply Network as detailed in
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 31
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
Advice Note: As detailed in the
(c) The measuring and recording device shall be available for inspection at all times by the Canterbury Regional Council. (d) All data from the recording device described in condition 3(a) shall be provided to the Canterbury Regional Council on request, and shall be accessible and available for downloading at all times by the Canterbury Regional Council. (e) Within six months of the commencement of this consent, and at five- yearly intervals thereafter, and at any one time when requested by Canterbury Regional Council, the consent holder shall provide a certificate to the Canterbury Regional Council signed by a suitably qualified person certifying the accuracy of the measuring and recording devices installed in accordance with conditions 9(a) and 9(b), and also certifying that data can be readily accessed.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 32
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER PU BLIC WATER SUPPLY
Review of Conditions 9. The Canterbury Regional Council may annually, on the last working day of June, serve notice of its intention to review the conditions of this consent for the purposes of: (a) dealing with any adverse effect on the environment which may arise from the exercise of the consent and which is appropriate to deal with at a later stage; or (b) complying with the requirements of a relevant rule in an operative regional plan. A consent duration of 35 years is sought for this permit, with a lapsing date of five years from the date of the decision. The Applicant proposes to discharge water to the Rogerson River under the following conditions: General 1. The discharge shall only be water and sediment from the Rogerson River and Dillons Stream authorised under Consent CRCXXXX, or any subsequent replacement consent. 2. Water discharged to the Rogerson River shall not exceed 68.3 L/s and shall occur at or about map reference NZTM2000: 1582589 mE 5293415 mN. 3. The consent holder shall surrender consent CRC981515 prior to the first exercise of this consent. Review of Conditions 4. The Canterbury Regional Council may annually, on the last working day of June, serve notice of its intention to review the conditions of this consent for the purposes of: (a) dealing with any adverse effect on the environment which may arise from the exercise of the consent and which is appropriate to deal with at a later stage; or (b) complying with the requirements of a relevant rule in an operative regional plan.
15.0 Conclusions Based on the information and assessment of environmental effects (AEE) carried out and presented in this report and the proposed mitigation measures, the potential adverse effects from the proposed activity are considered to be less than minor.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D 33
HURUNUI DISTRICT COU NCIL - ASSESSMENT OF ENVIRO NMENTAL EFFECTS ASSO C I A T E D WITH HANMER P UBLIC WATER SUPPLY
16.0 References Bowden, M.J.(1974), The water resources of the Waiau Catchment, North Canterbury Catchment Board and Regional Water Board. Clausen B., Biggs B.J.F. ( 1997). Relationships between benthic biota and hydrological indices in New Zealand streams. Freshwater Biology (1997) 38, 327- 342.
Dunn, N.R., Allibone, R.M., Closs, G.P., Crow,S.K., David, B.O., Goodman J.M., Griffiths, Jack, D. C., Ling, N., Waters J.M. and Rolfe, J.R. (2017). Conservation Status of New Zealand Freshwater Fishes. Environment Canterbury. (2013). Hurunui and Waiau River Regional Plan. Environment Canterbury. New Zealand Government. New Zealand. Facer, S. (2003), Seven day mean annual low flow mapping in the Waiau Catchment, Environment Canterbury Report No. U03/33. Franklin, P., Gee, E., Baker, C., Bowie, S., New Zealand Fish Passage Guidelines. NIWA client report No. 2018019HN. Hurunui District Council. (2006). Assessment of Water and Sanitary Services. Hurunui District Council. New Zealand Government. New Zealand. Hurunui District Council. (2012). Hurunui Community Long Term Plan 2012 – 2022. Hurunui District Council. Accessed on 17/08/2018 from http://www.hurunui.govt.nz/assets/Documents/Annual%20Plans%20and%20Rep orts/LTP-2012-22-Township-profiles.pdf Ministry of Health. (2018). Register of Drinking Water Suppliers for New Zealand Part one. Ministry of Health, New Zealand Government. New Zealand. Mosley M.P. (2004) Waiau River: instream values and flow regime. Technical report R04/02 prepared for Environment Canterbury by Dr M P (Paul) Mosley. NIWA (October 2007), Fish screening: good practice guidelines for Canterbury. NIWA Client Report: CHC2007-092. Hurunui Tourism Board (2017), Hurunui Tourism Strategy 2017-2022.
C03265401_R001_Final PATTLE DELAMORE PART N E R S L T D PATTLE DELAMORE PARTNERS LTD Figures A Appendix H A N M E R S P R I N G S W A T E R S U P P L Y
D IL L O N S S T R E A M
DILLONS STREAM INTAKE
1264
1265
KEY : 1259 ROGERSON RIVER INTAKE 1263 THREE GALLERIES LOCATION
C
R H N RIVE GAUGING SITE ERSO A ROG T
T
E DILLONS STREAM CATCHMENT UPSTREAM OF WEIR INTAKE R T
O
N
ROGERSON RIVER CATCHMENT UPSTREAM OF WEIR INTAKE R
I V
E
RIVERS R
SOURCE: 1. AERIAL IMAGERY (FLOWN 2014-2015) SOURCED FROM THE LINZ DATA SERVICE www.linz. SCALE : 1:35,170 (A4) govt.nz/about-linz/linz-data-service/help/using-linz-data/attributing- 0 375 750 1,500 aerial-imagery-data AND LICENCED FOR RE-USE UNDER THE CREATIVE COMMONS FIGURE 1: LOCATION OF HDC INTAKES, CATCHMENTS AND ECAN GAUGING SITES ATTRIBUTION 4.0 INTERNATIONAL LICENCE. 2. CADASTRAL/TOPOGRAPHICAL INFORMATION AND INSET DERIVED FROM MFE Metres DATA SERVICE AND LICENCED FOR RE-USE UNDER THE CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENCE. P A T T L E D E L A M O R E P A R T N E R S L T D C03265401F006.mxd 0818 ISSUE1 H A N M E R S P R I N G S W A T E R S U P P L Y
DILLONS STREAM WEIR
D I L L O N S
S T R E A M
INLET TO POND FROM INTAKES R O E T IV E R G N R O A S H R C E SETTLING BASINS IS G ROGERSON RIVER WEIR D O R
ER RIV OUTLET TO ON RS HANMER WATERSUPPLY GE RO
LKeEYg :end
THTHRREE EG GAALLELERRIEIESS L LOOCCAATTIOIONN
WOEUIRTSLET STREAM
OWUTELIREST STREAM RIVERS RIVERS RIVERS DRAIN DRAIN
SOURCE: 1. AERIAL IMAGERY (FLOWN 2014-2015) SOURCED FROM THE LINZ DATA SERVICE www.linz. SCALE : 1:5,000 (A4) govt.nz/about-linz/linz-data-service/help/using-linz-data/attributing- 0 50 100 200 aerial-imagery-data AND LICENCED FOR RE-USE UNDER THE CREATIVE COMMONS FIGURE 2: SCHEMATIC OF INTAKES, PONDS AND DISCHARGE ATTRIBUTION 4.0 INTERNATIONAL LICENCE. 2. CADASTRAL/TOPOGRAPHICAL INFORMATION AND INSET DERIVED FROM MFE Metres DATA SERVICE AND LICENCED FOR RE-USE UNDER THE CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENCE. P A T T L E D E L A M O R E P A R T N E R S L T D C03265401F005.mxd 0818 ISSUE1 HANMER SPRINGS WATER SUPPLY
D IL L O N S S T R E A M
DILLONS STREAM INTAKE
ROGERSON RIVER INTAKE
C
H
KEY : A
T
T IVER E R R THREE GALLERIES LOCATION ERSON ROG T O PROPOSED COMMUNITY DRINKING WATER SUPPLY PROTECTION ZONE N
R
I V RIVERS E R
SOURCE: 1. AERIAL IMAGERY (FLOWN 2014-2015) SOURCED FROM THE LINZ DATA SERVICE SCALE : 1:35,000 (A4) www.linz. govt.nz/about-linz/linz-data-service/help/using-linz-data/attributing- 0375 750 1,500 aerial-imagery-data AND LICENCED FOR RE-USE UNDER THE CREATIVE COMMONS FIGURE 3: PROPOSED COMMUNITY DRINKING WATER SUPPLY PROTECTION ZONE ATTRIBUTION 4.0 INTERNATIONAL LICENCE. 2. CADASTRAL/TOPOGRAPHICAL INFORMATION AND INSET DERIVED FROM MFE Metres DATA SERVICE AND LICENCED FOR RE-USE UNDER THE CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENCE. P A T T L E D E L A M O R E P A R T N E R S L T D C03265401F007.mxd 0818 ISSUE1 PATTLE DELAMORE PARTNERS LTD Existing HDC Consents B Appendix
Printed: Tuesday, 21 August 2018
Record Number: CRC961844 Record Type: New Consent Permit Type: Water Permit (s14) Record Holder: Hurunui District Council Record Status: Terminated - Expired File Number: CO6C/11212 Previous Record(s): Next Record(s): Location: Rogerson Road, HANMER SPRINGS Description: to take water from Dillon Stream at or about map reference N32:924-552 for the domestic supply of Hanmer Springs Township.
Key Dates: Event Date Commencement Date 01 Apr 1996 Expires 27 Mar 1997
Workflow (Only shows if workflow has open tasks): Task Name Task Status Task Status Date
Conditions: No Text 1 The rate at which water is taken shall not exceed 15 litres per second, with a volume not exceeding 1080 cubic metres per day.
2 Charges, set in accordance with section 36 of the Resource Management Act 1991, shall be paid to the Regional Council for the carrying out of its functions in relation to the administration, monitoring and supervision of resource consents and for the carrying out of its functions under section 35 of the Act.
Record Number: CRC961844 PATTLE DELAMORE PARTNERS LTD strategy HDC waterasset supply management C Appendix Management of Water Restrictions for Hanmer Springs Water Supply
The Hurunui District Council (HDC) asset management plan (AMP) sets out water demand management strategies for all their water supply schemes. A copy of the water demand management section of this AMP is included below.
Water management restrictions for each water supply scheme will be different as these depend on the requirements in the relevant regional plans. An example of how water restrictions management (using the Ashley River as an example) could be set out is included in the water demand management section of the AMP below.
The relevant regional plan for the Hanmer Springs Water Supply is the Hurunui and Waiau River Regional Plan ( HWRRP). This section sets out the management of water restrictions for the Hanmer Springs Water Supply based on the requirements in the HWRRP.
The HWRRP defines a Water Supply Asset Management Strategy as:
‘A strategy that describes how water usage will be reduced at times of low flow to ensure that no more than 250 l of water is provided to each person per day and no more than the limits specified in Schedule WQN11 of the Natural Resources Regional Plan (NRRP) is provided to stock, when the flow in the surface water body is at or below the minimum flow specified in the Environmental Flow and Allocation Regime as shown in Table 1’
For the Chatterton Surface Water Allocation Zone (which also covers the Rogerson River and Dillons Stream) these measures are required when the flow in the Chatterton River falls below 220 L/s or when the Waiau River (at Marble Point) falls below the minimum flow for A permits (20 m3/s).
The following table presents the water conservation measures including trigger alert level, demand management and method of communication for the Hanmer Water Supply.
Water Restriction Management for Hanmer Water Supply Flow Rates Flow Rates Demand Management During Method of Trigger Level – Trigger Restriction Communication Chatterton Level – River Waiau at Marble Point 1. No more than 250 l of water provided Continuous public to each person per day. To achieve this education: the following actions will be undertaken: -Public notifications to - Total hose ban; conserve water; - All irrigation, car washing, -Notices on social media incl. Council’s non-domestic water use website home page. prohibited; - Reduction in domestic - E-mail or letter drop When flow to consumers When flow falls falls below: water use e.g. 3 minute below 220 L/s 20 m3/s showering, toilet flushing These methods of only when necessary etc. communication will 2. Stock water use limited to also be used when Peak daily water flows approach the requirements as specified in flow trigger levels to Schedule WQN11 ensure that the scheme users are aware of any upcoming restrictions.
Water Demand Management Section of Asset Management Plan
i. Water Demand Management Demand Management strategies are used as alternatives to the creation of new assets. They are aimed at modifying customer demands to achieve: Social, environmental and legislative objectives for Hurunui District The delivery of cost-effective services Defer the need for new assets and optimise the performance/utilisation of the existing assets The Council is working on a range of strategies to manage the demand for water and therefore the requirement for additional infrastructure. The table below lists some of the strategies that have been considered. Excess use has been discouraged by an ongoing programme of fitting water meters at each point of supply in each on-demand scheme.
Demand Management Strategies Strategy Objective/ Description Priority Demand Actively monitor current demand in all water schemes Monitoring Identify water scheme target consumption in terms of L/property/day for the 1 purposes of benchmarking Water Losses Quantify the current level of water loss for each water supply to determine if and leakage is an issue Unaccounted Identify target minimum night flow for each scheme and use as a trigger for for Water Use when Council needs to initiate investigations (e.g. leakage detection or other 1 control measures) Investigate cost of purchasing leakage detection equipment and training versus cost of contracting to leakage detection consultants Operations System Pressure Management Pressure measurement is being done throughout the on-demand networks to enable changes that will reduce operating pressures which impact on reticulation and reduces water losses. This needs to be balanced with Levels 1 of Service with the consumer on adequate pressure Variable speed drives have been installed at pump stations that were experiencing excessive pressure surges Pipe Continue to utilise pressure management as a means of extending pipe asset Infrastructure life
Undertake condition assessment of asbestos cement (AC) pipes Progressively fund renewals programme for replacement of aged pipes Policy Develop a Water Management Strategy to encapsulate the overall planned management of the water takes, use, and conservation education with an aim 1 to reduce the per capita consumption. This is consistent with Council’s resource consents requirements. Education Educate the public on the Council’s Water Management Strategy: - benefits of private storage 2 - reducing water usage and wastage Water Continue universal metering and install water meters on all industrial and non- Charges urban users in Leithfield Beach. This strategy is seen to help in terms of demand management although 2 universal metering has a significant capital and operating costs that may not provide the long-term benefits of demand reduction. It has been observed that the consumption in metered areas is lower than the non-metered areas. Water Historically water restrictions have not been required. Restrictions Develop and adopt Water Restriction Management Plans appropriate for each 2 water scheme. Maintain the Water By-Law to ensure prudent use and require consumers to Strategy Objective/ Description Priority comply with any water restrictions publicly advertised during droughts, periods of unusually high demand or emergencies. Scheme Maintain hydraulic models of water schemes to allow capacity assessments 2 Design against growth forecasts to be carried out. Land Use Continue to actively incorporate impact of land use changes identified in the 2 District Plan into water demand forecasting. Climate Continue to monitor climate change forecasts for the district, and subsequent 3 Change impact on water demand (irrigation).
ii. Management of Water Restrictions The following presents an example of the trigger alert levels and subsequent action for the management of water restrictions. This will be further developed by the Council on a scheme by scheme basis and subsequently adopted during any future water supply restriction event.
Example of Water Restriction Management (Ashley Rakahuri River) Level of Flow Rates Trigger Level Demand Management Method of Communication Restriction – Ashley Rakahuri River During Restriction
C block minimum flow Alternate day watering, Continuous public education 3 ≤6,000m /day evenings only Signs at town entry points Level 1 Public notifications to conserve water Notices on social media inc. Council’s website home page When B block flow: Hand held hoses only As for Level 1 ≤3,200m3/day (Jan- Jul) Ban on non-domestic use 3 and sprinklers Level 2 ≤4,700m /day (Aug-Nov) ≤3,700m3/day (Dec) Commercial irrigation limited to 2 hrs and night (6am-8am and 6pm-8pm) When flow falls below: Total hose ban As for Level 1 2,500m3/day (Jan-Jul) All irrigation, car washing, 4,000m3/day (Aug-Nov) non-domestic water use 3,000m3/day (Dec) prohibited Level 3 Under ‘extreme’ conditions (emergency purposes): Reduction in domestic water use e.g. 3 minute showering, toilet flushing only when necessary
PATTLE DELAMORE PARTNERS LTD RogersonRiver Flow and water depthdataforthe D Appendix 1264 Rogerson River at 1263 Rogerson River at 1259 Rogerson River at 1265 Rogerson River at Downstream Stoney Chatterton River Date Upstream Reservoir Downstream Weir Creek Road Confluence Flow Max water Flow Max water Flow Max water Flow Max water (m3/s) depth (m) (m3/s) depth (m) (m3/s) depth (m) (m3/s) depth (m) 29-Mar-73 0.192 0.23 0.237 0.24 27-May-87 0.576 0.31 0.999 0.44 25-Jun-87 0.663 0.29 30-Jul-87 0.773 0.41 13-Aug-87 0.729 0.38 10-Sep-87 1.53 0.46 8-Oct-87 0.726 0.4 9-Nov-87 0.57 0.29 9-Dec-87 0.676 0.36 14-Jan-88 0.425 0.32 11-Feb-88 0.313 0.4 9-Mar-88 0.797 0.38 7-Apr-88 0.43 0.44 11-May-88 0.709 0.4 10-Dec-15 0.237 0.37 15-Dec-15 0.207 0.38 15-Jan-16 0.481 0.5 10-Feb-16 0.543 0.48 12-Apr-16 0.259 0.26 20-May-16 0.319 0.32 21-Jun-16 0.53 0.54 20-Jul-16 0.659 0.56 23-Aug-16 0.686 0.54 22-Sep-16 0.522 0.54 20-Oct-16 0.627 0.56 24-Nov-16 0.802 0.46 26-Jan-17 0.36 0.39 21-Feb-17 0.279 0.4 19-Apr-17 1.067 0.37 16-May-17 0.598 0.28 21-Jun-17 0.468 0.34 18-Jul-17 1.468 0.4 22-Aug-17 1.519 0.48 21-Nov-17 0.355 0.32 19-Dec-17 0.254 0.28 25-Jan-18 0.506 0.295 21-Mar-18 0.592 0.335 9-May-18 0.547 0.38 19-Jul-18 0.81 0.44 29-Aug-18 0.518 0.31