Catchment Operations Committee 10 August 2016
Report No. 16-152 Information Only - No Decision Required
RIVER AND DRAINAGE ENGINEERING REPORT (PRD 01 02)
1. PURPOSE
1.1. The purpose of this item is to report on progress with river and drainage activities for the period 1 June 2016 to 31 July 2016.
2. RECOMMENDATION
That the Committee recommends that Council: a. receives the information contained in Report No. 16-152 and annexure.
3. FINANCIAL IMPACT
3.1. Funding provision for all activities reported on in this item is either included in the River and Drainage General or River and Drainage Schemes Activity sections of the 2015-25 Long-Term Plan (LTP); is covered by an approved carry-forward of unexpended budget in 2014-15; or additional approval will be specifically sought by way of recommendation in the item.
4. COMMUNITY ENGAGEMENT
4.1. Various matters contained in this item either have been, or will be, communicated with scheme ratepayers through their respective Scheme Liaison Committee and / or Annual Catchment Community Meetings. As necessary, other issues will be the subject of media releases.
5. SIGNIFICANT BUSINESS RISK IMPACT
5.1. There are no significant risks inherent in the adoption of recommendations contained in this report. As previously reported there is a risk of the drawdown of an excessive proportion of individual scheme emergency reserve funds for the purpose of flood damage reinstatement relating to the June 2015 event. Realising this risk would require Council’s application for assistance under the National Civil Defence Emergency Management Plan (the Plan) to be declined. Although the substantive claims are yet to be lodged receipt of payment for the first claim significantly improves certainty and consequently measurably reduces this particular business risk.
6. DISCUSSION
6.1. As noted by email to Councillors on 5 July, Civil Defence Minister Nikki Kaye has approved payment of the first claim for financial assistance associated with the reinstatement of flood damage arising from the June 2015 Region-wide floods. As previously advised, Ministry of Civil Defence and Emergency Management (MCDEM) staff determined that a small number of items that formed part of the initial claim lay outside the criteria for assistance under the Plan. A first claim figure of $1,661,395 was settled on after negotiations between Horizons and MCDEM staff on relatively minor points of detail, meaning that the
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Catchment Operations Committee 10 August 2016 60% reimbursement of $474,313.80 was received after the threshold of $870,872 was deducted. That compares with the earlier expectation of just under $486,000. 6.2. Receipt of that payment required a determination on whether it should rest in the 15-16 or 16-17 financial years. A staff recommendation was put to the Audit and Risk Committee Chair to have the payment recognised in the 16-17 financial year; Cr Rieger approved this recommendation. Although this decision has some modest impact on the 15-16 result this is outweighed by the complexities in splitting the MCDEM payments over financial years, particularly with the requirement that the event deductible is dealt with in its entirety in the first claim and given that the shape of the following two claims is still to be finalised. 6.3. Staff have now begun to prepare the second claim, with MCDEM staff already visiting some of the sites that will form part of that claim. A further visit is likely in early August. That claim will cover the entire repair and response cost attributable to the June 2015 event that fell within the 15-16 financial year that was not included in the first claim. 6.4. The second claim is likely to be ready for submission by mid August and will comprise 81 sites with combined value of $1.3 million, around $350,000 less than originally estimated, reflecting both changes in scope from that originally envisaged and the definition of what is claimable determined through the first claim process. It is also likely that the third and final claim will be larger than originally envisaged; the combined effect of the Rural Upgrade Project and the June 2015 flood damage repairs placed some strain on the River Management Group’s resources and as a result less flood damage repair work was completed than had originally been envisaged. Some Rangitikei Scheme work was also deferred pending the outcome of the first claim, allowing for the reserves position of that scheme and the urgency/ criticality of the work. With the deductible dealt with up front in the first claim the MCDEM payment for the second claim should total around $0.78 million (60%). A third and final claim will be made later in the calendar year encompassing the remainder of the flood damage work completed in the 16-17 financial year. 6.5. Much of the operational activity within the River Management Group over the period has centred on wrapping up financial matters relating to the 15-16 financial year and planning for the various tasks/ projects to be delivered in the 16-17 financial year. 6.6. The most substantial physical works deliverable in the 16-17 financial year is Year 11 and penultimate year of the Lower Manawatu Scheme (LMS) Rural Upgrade Project. The Year 11 programme involves further work to stopbanks alongside the Oroua River, various reaches of the Manawatu River and for the Tokomaru River. Stopbanking alongside the lower reaches of the Tokomaru River is regarded as an LMS asset rather than a Makerua Scheme asset as flood levels are dictated by the backwater effect from the Manawatu River rather than conveyance of Tokomaru River flood flows. 6.7. As with previous years, at this early stage in the deliverables programme a number of risks exist with the potential to delay one or all of the constituent parts. Those risks include successfully negotiating landowner approvals/ entry agreements, having sufficient market interest/ competition for the construction work (and linked to that contract prices that reflect some similarity with the cost estimates made) and favourable weather conditions. 6.8. Initial Project Team meetings have highlighted a potential risk in in delivering the upgrade extent contemplated for the Tokomaru River within the time and budget constraints set. The scope of work involves raising the crest level of the existing structure to achieve a more consistent longitudinal profile and largely assumes the integrity of the existing structure is satisfactory for that to occur (avoiding the need to completely rebuild the structure). Little factual information exists in regard to that integrity and the competency of the foundations but site conditions and anecdotal information suggests some similarities with the Linton Main Drain stopbanks; this part of the network has previously identified integrity issues. Geotechnical investigations have been commissioned which will enable decisions to be made around the scope of the works and that may necessitate further decisions by Council around the scope of the Rural Upgrade Project.
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Catchment Operations Committee 10 August 2016 6.9. Staff met with New Zealand Transport Agency (NZTA) and Horowhenua District Council (HDC) staff on 14 July to discuss flooding issues at Kuku south of Levin. Kuku Stream has catchment characteristics that generate flood flows larger than a cursory assessment of the stream would suggest. State Highway 1 traverses a discernible alluvial fan formed by the stream, giving rise to route security concerns for NZTA and causing issues for adjoining landowners. The three organisations have agreed to work collaboratively to identify any feasible mitigation options with NZTA appropriately taking the lead. 6.10. Staff met with HDC staff and Foxton Community Board members on 25 July to discuss stormwater/ flood hazard issues facing Foxton, a 16-17 Annual Plan (AP) target. As a result of that meeting Horizons Regional Council and HDC staff are intending to jointly fund a piece of technical work seeking to identify a long-term flood hazard mitigation/ stormwater management strategy for the town, which could potentially involve substantial/ long term capital expenditure. Once preliminary technical work is complete an initial round of community consultation will take place. The consensus of the meeting was that a stormwater pumping station is somewhat inevitable for Foxton, particular when climate change effects are considered. 6.11. The Foxton Loop Working Group meeting scheduled for 7 July was cancelled with the next meeting scheduled for 4 August. HDC are expecting their consultants GHD Limited to report their findings at that meeting. 6.12. Although proposed as an agenda item for this Committee meeting, no further consideration has yet been given to the Rangitikei Scheme since the last report to Committee in June. This is in part due to the imminent resurvey of cross-section lines for the Rangitikei River this summer; trends/ changes in river bed levels will significantly influence the way the scheme is managed. At this stage it is intended to make provision in the 17-18 Draft Annual Plan (DAP) for the compilation of a management strategy for the Rangitikei Scheme, with the intent of better aligning day-to-day operational activity with past reviews, thereby ensuring the scheme continues to head toward a more sustainable management approach. 6.13. Staff have been working with Manawatu District Council (MDC) on achieving stormwater neutrality as part of the Feilding Urban Growth Framework Plan (ensuring further development does not exacerbate flood hazard locally or compound matters downstream, particularly with respect to spillway discharges into the Taonui Basin). The mitigation strategy focusses on floodwater storage and MDC staff have invited HRC staff to meet to discuss how this might benefit the LMS and how it can be progressed. 6.14. Staff have also been trialling the use of a drone (unmanned aerial vehicle) as a management tool for areas of operational activity that have a high criticality. At this stage it is planned to capture the Mangaone Stream corridor through Palmerston North at regular intervals as an added means of ensuring some of the inherent risks (an active stream with narrow berms and stopbanks protecting high value urban/ commercial/ industrial areas) are being adequately managed. 6.15. Council is facing possible legal action from a landowner adjoining the Oroua River associated with the extraction of gravel under consent held by HRC. The landowner contends that this section of the Oroua River bed is private land (access to the site is across an adjoining landowner’s property) and that some form of compensation is payable. Ownership of the bed is not clear but in any event legal advice concurs with the views of staff that the activity is consistent with Council’s river management mandate under the 1941 Soil Conservation and Act. The landowner is therefore entitled to compensation as it relates to injurious affect; in this context that would be land damage - damaging the bed of a river. 6.16. With the support of the National Beekeepers Association, a collective of various crown agencies have secured financial assistance from the Sustainable Farming Fund to look at
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Catchment Operations Committee 10 August 2016 biological controls for the Giant Willow Aphid. As previously reported a number of schemes (and in general those facing the more substantive challenges – eg Rangitikei, South East Ruahine) are facing a threat from the Giant Willow Aphid as it attacks protection plantings. How much of an impact will become clearer in the spring. Regional councils from around the country are also funding the research – from a Horizons perspective that cost will be spread across the schemes that stand to benefit from the research. 6.17. The Whanganui Flood Management Review Group produced its second deliverable over this period, a report summarising investigations and analysis relating to Awarua Stream flood hazard. This is covered in more detail in a separate report. 6.18. Following on from the last report to Committee, staff are continuing to work with KiwiRail staff on some of the river/ debris management issues facing the Ngawapurua Rail Bridge. This includes exploring an arrangement where HRC manages some of those activities on behalf of (and at the cost of) KiwiRail. This will require careful management of liability and expectations around response time etc (ensuring that commitment is not to the detriment of core business). The arrangement will not extend to design or consenting. 6.19. Senior/ technical staff recently attended an in-house workshop on rock riprap design and construction. Facilitated by both staff and an external consultant, the intention of the workshop is to improve the level and breadth of understanding across the Group. It is intended to run regular technical training sessions to further develop the level of expertise within the Group. Training has also been provided on amendments to the Construction Contracts Act and the consequent amendments to the form of contract used by Council for physical works (NZS3910). 6.20. On a final note, River Management, Emergency Management and Catchment Data staff have all been involved in monitoring a series of weather events during the period, most noticeable the Makino Stream toward the end of the reporting period. As reported to the June Committee meeting, the Makino Gate structure remains as one of the more significant operational risks for the River Management Group; although a number of recent initiatives have reduced that risk, it is intended to make provision in both the 17-18 AP and the 2018-2028 LTP to make more substantive reductions to those risks.
7. INVESTIGATIONS AND DESIGN
INVESTIGATIONS
7.1. Following the 19-21 June 2015 floods the intensive demand on design resources on both scheme and public matters related to the flood, continues at a high level, but the number of enquiries and tasks is now decreasing. 7.2. The 2016-17 Design & Investigations Team Programme was produced and confirmed. There are 36 separate tasks identified.
LOWER MANAWATU SCHEME
7.3. The oncoming 2016-17 summer construction season is Year 11 in the 12 Year Rural Upgrade Project. Design work is well advanced on planned upgrades in Year 11 of the upgrade to achieve the 1% Annual Exceedance Probability (AEP) (100 Year) standard with 450 mm freeboard. During the reporting period designs on these works have included:
• Further design levels for the Whakarongo stopbanks. As advised previously, degradation has caused erosion problems since 2004 and consequently the design of the stopbanks has been based on recovered bed levels.
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Catchment Operations Committee 10 August 2016 • Design advice on the input on the need for testing of ground and stopbank conditions on the Tokomaru and Linton Main Drain stopbank upgrades. This will need to cover the increased seepage pressures on the stopbanks resulting from the increased head of the raised stopbank in addition to any erosion threats.
• The survey brief was confirmed for the Mangaore Stream stopbanks.
7.4. Design advice was provided to solve the matter of ponding of floodwaters behind the Mangaone stopbank at Richardsons Line. Options for the stopbank at Benmore Avenue were considered and a detailed design solution is programmed for September. 7.5. Ongoing design information has been supplied to the Foxton Loop Working Party.
LOWER WHANGANUI RIVER
7.6. No substantive investigations have been required. However, periodic enquiries have been answered on the findings of the major report prepared on the June 2015 flood.
AWARUA STREAM
7.7. A detailed report reviewing the flood risks and flood mitigation options at the Awarua Stream was presented to and adopted by the Whanganui Flood Management Review Group. This is the subject of a separate report.
TUTAENUI STREAM HYDRAULIC MODELLING AND AUDIT
7.8. The results of both the floodplain modelling and scheme audit were intended to be presented to the August Committee meeting. Unfortunately commitments in the form of additional investigation and analysis relating to the Awarua Stream and the later than programmed delivery of the Light Imaging, Detection, and Ranging (LiDAR) dataset for the Tutaenui catchment means that modelling work is still currently underway. It is intended to report both the audit and the flood plain modelling to the November Committee meeting.
MAKOTUKU STREAM HYDRAULIC MODELLING
7.9. The modelling of the Makotuku Stream and Makara Stream have proved challenging. This is due to the aggressive nature of the streams environment and debris issues associated with the October 2015 calibration event. A sparse amount of recorded flood level information and calibration data has magnified the problem. However, three recorded marks in Raetihi and the Makotuku Stream shows that there was overflow into the sewage ponds in that event. 7.10. This has taken a considerable depth of discussion with the modelling consultant DHI Ltd resulting in a calibrated model being completed. Design runs are due to be completed shortly. 7.11. A separate flooding issue through Raetihi from the interior streams was not within the scope of this investigation. However, the investigation will be able to give a good guide on mitigating flooding from tributaries between Seddon and Grey Streets close to the Makotuku Stream. It seems likely that channel vegetation clearance will mitigate this issue.
ASSET MANAGEMENT SYSTEM SOFTWARE UPDATE
7.12. Validation checks of updates to the Asset Management System (AMS) software identified some issues still to be addressed by Datacom but other priorities have slowed progress
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Catchment Operations Committee 10 August 2016 and it is unclear when the update will go live. A corporate initiative considering a more integrated approach to asset management may subsume this matter.
ANNUAL CAPITALISATION
7.13. Most of this period has been involved in the AMS capitalisation process for input into the Annual Report. The process started earlier this year to help streamline audit requirements and ensure deadlines associated with the Council elections were met. 7.14. The capitalisation has involved allocation of $7.2 million of expenditure this year, plus $3.9 million of expenditure from previous years for Work in Progress (WIP). Most of this WIP was for the major projects now completed in the LMS city reach, including $3.3 million for Anzac Cliff rock lining and $616,000 for Turitea Science Centre stopbanking. 7.15. Approximately $1 million of the $7.2 million expenditure this year has been allocated to WIP pending completion of various works next year. 7.16. The resulting total 2015-16 capex allocation to scheme assets amounts to $9.9 million, with most of this ($9.27 million) attributable to the LMS including such major works as the rock lining at Anzac Cliff and various stopbanking improvements for the LMS Rural Upgrade Project. 7.17. Some of the capital expenditure has involved non-scheme assets and has subsequently been written-off (1 July 2016). This included approximately $230,000 for raising Hoihere Road as part of the LMS Oroua River stopbank and $400,000 for Taonui Basin flood mitigation works involving raising houses and building platforms. 7.18. The capitalisation process also involves updating the AMS database for the valuation of any asset “additions and disposals” during the year. In previous years there have been some major changes due to mapping audits and reconciliation with the AMS data. As the mapping audits were largely completed last year there was expected to be only minor changes, particularly due to the June 2015 flood. 7.19. Some significant changes in the South East Ruahine Scheme had already been identified last year due to the inadvertent omission of $1.2 million of assets in the mapping audit 2014-15. Most changes in other schemes were relatively minor but revised dimensions for four major concrete riprap assets in the LMS resulted in their value being increased by $1.5 million. This value is based on the unit rates for rock work used for the 3 yearly revaluations, 1 July 2014, and accounted for most of the total $1.77 million increase in total scheme valuation. 7.20. As a result of capitalisation this year the total replacement value of all scheme assets (including WIP) is approximately $390 million at 1 July 2016.
DESIGN ADVICE
7.21. During this period ongoing design advice has continued to be given to River Management staff, other departments, and Territorial Local Authority (TLA) staff in relation to a variety of matters. They continue to be mainly focussed on flood related matters as outlined above. Designs completed included:
• Advice on the appropriate use of oversized rock on the Hoults rock lining in the Manawatu River.
• Assessment of the design flood levels at the site of a proposed MDC footbridge in the reserve between Stonebridge Court and Lethbridge Road Feilding. This is a stream with headwaters extending to Mt Taylor with a catchment area of 139 ha. The conclusion was that the proposed footbridge had adequate freeboard above
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Catchment Operations Committee 10 August 2016 the 0.5% AEP (1 in 200 year) flood and would not deflect floodwaters into nearby houses.
REGULATORY ADVICE
7.22. A substantial but moderated amount of regulatory work was completed with recorded advice provided on 41 substantive matters during this reporting period. The 2016-17 total of 282 matters was well above the 228 in the previous year. Additionally, there were numerous other matters quickly assessed and not recorded due to other pressing priorities. 7.23. This regulatory work involves specialist advice on flood risks and technical reports for consent applications, rezonings and subdivisions including:
• Advice on 22 flood risk and related enquiries.
• The design proposal by MDC to mitigate stormwater that would enter the Makino Stream or Taonui Basin was endorsed in principle. This would mean additional generated stormwater resultant from residential and industrial developments would be fully mitigated.
• Advice was provided on three bridges, two proposed culverts and one ford. This included a proposed culvert of the Waitewhena Stream upstream of Ohura.
• Advice was provided on applications for renewed gravel extraction consents in the Rangitikei River near Kakariki. These fully met previous policy on limiting extraction to mitigate degradation. Progress on the bed recovery will be assessed following the Rangitikei River survey programmed for the coming summer.
• Design information was provided on three separate investigations in the lower Whanganui River. These pertained to erosion repairs and a project on modelling the river mouth by consultants commissioned by Whanganui District Council (WDC).
• Advice was provided on repair works and a suitable fill site on State Highway 4 near Hapokopoko.
8. CENTRAL AREA
GENERAL
LOWER MANAWATU SCHEME RURAL UPGRADE PROJECT
8.1. Consistent rainfall was spread across this reporting period. This saw a gradual increase of the residual flow in the scheme rivers and medium flows in the scheme streams. 8.2. The total rainfall for the period (1 June 2016 to the 21 July 2016) has been recorded as: 120.5 mm at Milson Line (Mangaone); 133.0 mm at Cheltenham (Makino); 254.0 mm at Scotts Road (Kahuterawa); 345.0 mm at Delaware Ridge (Pohangina); 537.0 mm at Makawakawa Divide (Pohangina); and 222.0 mm at Rangiwahia (Oroua). 8.3. The Manawatu River experienced four flow peaks recorded at Manawatu Teachers’ College during this reporting period. The flows became increasingly larger as time progressed, with the residual level of the river increasing with time. The first being 275.753 m3s-1 (a stage of 2.034 m) on 13 June, followed by 331.777 m3s-1 (a stage of 2.268 m) on 1 July, 307.747 m3s-1 (a stage of 1.907 m) on 9 July and 521.478 m3s-1 (a stage height of 2.989 m) on 20 July.
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Catchment Operations Committee 10 August 2016 8.4. The Oroua River similarly had a steady increase in flow throughout June and into July, with two notable peaks. The first significant peak occurred on 8 July where a peak flow of 99.988 m3s-1 was recorded (with a stage height of 2.405 m). The second significant peak occurred on 20 July and saw a flow of 63.824 m3s-1 (a stage height of 2.018 m). 8.5. The Mangaone Stream had four significant peaks, spread evenly across the recorded time frame. Despite the peak flows occurring, the residual flow of the stream did not appear to be significantly affected. The first peak was experienced on 13 June with a flow of 15.338 m3s-1 (stage height of 1.855 m), the second flow reached a maximum of 17.134 m3s-1 (stage height of 1.951 m) on 13 June, the third flow was recorded as 11.770 m3s-1 (stage height of 1.652 m) on 14 July, and the last recorded peak flow occurred on 20 July with a flow of 10.630 m3s-1 (stage height of 1.581 m). 8.6. The Makino Stream had two significant peak flows in June and a comparatively consistent flow throughout July. The residual flow of the Makino Stream remained reasonably steady despite the peak flows. The first peak flow occurred on 13 June with a flow of 3.909 m3s-1 (stage height of 1.044 m), the second peak flow occurred on 29 June where a flow of 6.383 m3s-1 was recorded (stage height of 1.187 m). 8.7. The Tokomaru Stream had one significant peak late in July and otherwise had several insignificant peaks in June and early July, with the residual flow of the stream remaining fairly consistent throughout the reporting period. The significant flow peak was recorded on 20 July with a flow of 70.697 m3s-1 (stage height of 2.942 m). 8.8. The Kiwitea Stream’s flow fluctuated throughout June and July, with five evenly spaced flow peaks recorded. The first peak flow occurred as part of an event that spanned from May, the flow was recorded on 1 June at 9.665 m3s-1 (stage height of 1.312 m), the second occurred on 13 June with a flow of 8.890 m3s-1 (1.286 m stage height), the third on 29 June with a flow of 9.787 m3s-1 (1.316 m stage height), the fourth of 7.977 m3s-1 (1.254 m stage height) on 13 July, and the fifth peak occurred on 20 July with a flow of 7.162 m3s-1 (stage height of 1.224 m). 8.9. Scheme engineers have continued to assist in the delivery of the Rural Upgrade Project. design work for a concrete floodwall in the Taonui Basin this has now been completed and planning is underway for completion of the scheduled 2016-2017 Rural Upgrade Project works. Closed-Circuit Television (CCTV) inspections will be continuing for all culverts located within Rural Upgrade Project work programme area, to identify any repairs or renewals that can be done by the scheme during the upgrade works. 8.10. During this period, scheme staff continued to provide advice to ratepayers and other authorities with regard to the One Plan. These have included small enquiries and site visits, as well as compliance issues. 8.11. Annual inspections have now been completed by scheme staff. These were carried out from April – June and the results of these are currently being incorporated into the AMS, with the Geographic Information System (GIS) asset maps also to be updated. The results of these annual inspections help in forming the maintenance programs for the coming year. 8.12. Training attended by scheme staff include: first aid course refreshers and a workshop run by the Concrete Pipe Association of Australasia. The concrete pipe course comprised of a brief overview of current concrete pipe standards, as well as basic industry best practice methods and common causes of faults and failures.
LOWER MANAWATU SCHEME
8.13. Works undertaken on the various rivers within the scheme during this period include the following:
MANAWATU RIVER
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Catchment Operations Committee 10 August 2016 8.14. Maintenance throughout the city reach is continuing where possible, however this time of year is often quiet. Annual inspections have been completed along with drain debris clearing and graffiti removal. 8.15. Scheme engineers have been assisting PNCC with He Ara Kotahi, the shared path that will run along the Manawatu River, and the Kahuterawa and Turitea Streams. Staff assisted by undertaking site visits, and providing advice regarding runoff, along with small design changes to reduce ongoing maintenance, such as removal of small culverts in favour of contouring the ground. Discussions on future developments along the pathway, such as planting plans, have also been discussed. 8.16. Waitoetoe Park has been a topic of discussion and development for several years. Scheme staff are currently working with PNCC, members of Horizons’ Natural Resources and Partnerships Team and interested local community groups, such as Friends of Waitoetoe Park, to assist in the development of an overall plan for the area. A meeting was held at Waitoetoe Park on 22 July with Friends of Waitoetoe Park, Horizons’ staff and a member of PNCC. This meeting was held with the purpose of consulting with the community group and for them to generate a ‘wish list’ for the parks’ development. Horizons’ staff talked about the importance of managing berm flows to avoid erosion, and vegetation management so that it would not adversely affect the flood carrying capacity of the channel. Senior technical staff are intending to discuss this matter in more detail with a view to enabling better precision around what the scope for enhancement work might be. 8.17. Scheme staff have continued maintenance tasks along the river, floodway and around the Moutoa Sluice Gates and Tower. These included inspecting and clearing floodgates and apron area, spraying the lime caps of the gate piers and cleaning drains. Due to ground conditions mowing was not undertaken this reporting period. 8.18. Significant erosion damage remains in the Ashhurst Domain area upstream from the Road Bridge. If left unchecked, this erosion will cause the river to adopt an undesirable meander pattern and cause erosion downstream. At the time of writing, a contractor is onsite undertaking tied tree work in an attempt to hold, or at least reduce, the amount of loss through winter until a more permanent solution can be found. An aerial drone flight is being arranged to fly over the area later in the year to provide clearer information on current river alignments and assist in identifying what the most cost-effective management approach is. 8.19. The June 2015 event caused significant damage along the banks at Hoults yard in Aokautere, where recently constructed bank protection works were destroyed as a result of weakening of the upstream berm caused by a slip. The repair works have been designed and the contract awarded. The placement contract for Hoults is awaiting suitable weather conditions to commence, and given the present weather conditions, is highly unlikely to proceed before spring. 8.20. The concrete riprap that was stockpiled on Van Echten’s property, opposite the Hoults yard, has been placed. Bank protection works that were recently completed at Sproull’s property in Aokautere are holding up well to recent freshes. 8.21. Slumping of topsoil has occurred in some places along the newly upgraded stopbank in Rangiotu. This was a result of very heavy rain events experienced soon after completion and is not being claimed as a defect of the contract works. The defects liability period for this contract expires 9 August. It has been agreed with the landowner, Robert Ervine, that remedial works will be completed by the scheme once ground conditions allow. Repair works undertaken in wet winter conditions may leave the site more vulnerable due to compaction issues and limited vegetation growth. An updated design has been completed for the remaining floodwall as part of this same upgrade and is scheduled to be installed early in the coming construction season. 8.22. A wake boarding park is currently under construction behind the Foxton Loop stopbanks, at the south end of the township. The proximity of this development to the stopbanks and the
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Catchment Operations Committee 10 August 2016 criticality of this part of the network has caused concern regarding potential impacts on stopbank integrity. Geotechnical engineers from Wellington-based engineering consultant firm DamWatch have been engaged to assist Council in more accurately quantifying that impact. 8.23. Staff have been dealing with an accretion claim on the left bank of the Manawatu River, near Aokautere. Along with current asset records, historical aerial photographs have been obtained from both the Horizons’ library and Archives Central to assist in determining whether or not the land had been added to the river bank by the process of accretion or by the occurrence of avulsion. In some areas it would be preferable to retain an esplanade strip or reserve to allow room for future river channel migration to occur. This would reduce the confinement of the river and the potential for significant protection works in the future. Currently there are no provisions for this kind of arrangement to occur.
OROUA RIVER
8.24. Asset inspections have been completed on the Oroua River for April-June, which will drive next year’s works programme. Nine sites were identified as requiring repair works, and two additional sites were identified as requiring capital expenditure. 8.25. The raising of the stopbank at Saunders’ property in the Glen Oroua region has been suspended due to the prevailing weather. Approximately 1,000 m of stopbank has been raised to height, with the remaining 200 m scheduled to be undertaken when conditions allow; likely in November. The works undertaken in raising the stopbank were executed on the land side of the stopbank allowing reassurance that the integrity of the stopbank has not been significantly compromised as a result of the works. When work resumes at the site the remaining 200 m of stopbank will be raised, the borrow areas will be filled with material taken from the river channel, all fences will be reinstated, and exposed earth soil will be grassed. As a result of observations by the landowner, staff will also investigate a possible seepage path under this part of the network. 8.26. Willow mulching has continued to occur on the Oroua River. The mulching undertaken mirrored the works completed on the true right bank in May to ensure that the flow of the Oroua is concentrated within the river channel, whilst keeping the river banks adequately protected. Work was undertaken from 14 km to 20.5 km on the left bank. Remaining wooden debris piles left on the berm following collection from the river channel from the June 2015 flood have also been burnt. 8.27. Staff have been working with adjoining landowners to explore disposal options for some of the silt accumulating on the berms of the Oroua River. LiDAR photography has been done of the paddocks adjoining the river, with the intention of approaching landowners with low spots to determine whether they are amenable to having these low areas filled. Initial feedback from landowners has seen two main issues raised; the transportation of the noxious weed field horsetail from the river channel to farmland, and the potential decrease in fertility of land as a result of the silt spreading. 8.28. Scheme engineers are also assisting the Rural Upgrade Project on the Oroua River stopbanks. As part of the Rural Upgrade project, significant work is proposed downstream of Rangiotu Bridge. The stopbank requires raising however, the footprint is constrained by an existing workshop. The stopbank is also on the edge of the river, with no berm, so a rock lining will be required to protect the bank with a very costly concrete retaining wall on the landside of the bank. Given the condition of the workshop that is adjacent to the stopbank, it may be more cost effective to buy the workshop, and move the stopbank away from the river.
MANGAONE STREAM
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Catchment Operations Committee 10 August 2016 8.29. Due to the time of year, very little general maintenance has been completed along the stream reserve. There have been several enquiries from, and visits to, properties with requests for trees to be removed. These will be removed later in the year when possible. 8.30. Mowing of the Mangaone Stream city reaches has not been completed this reporting period due to the wet ground conditions. The next mow will be completed as soon as ground conditions allow. 8.31. The old dog pound site on Botanical Road, where vegetation was removed last reporting period, has been identified as a possible stock pile area for works to be undertaken by PNCC in the coming months. PNCC have resource consent to construct walkway/ cycleway underpasses at bridges through out the city, which currently lapses in October. Botanical Road and Highbury Avenue are the next locations on the list. PNCC have approached River Management staff to assist in obtaining a variation to their resource consent, due to some redesign issues and time pressures from the NZTA. Horizons will not approve any significant works to be undertaken in the Mangaone before October. 8.32. Scheme staff are continuing to liaise with PNCC regarding repair requirements around city assets on the Mangaone Stream. Where the walkway is planned for construction under bridges, and repairs are less urgent, protection works will be combined with the walkway construction, such as the aforementioned underpass for Botanical Road. 8.33. The Mangaone Stream city reach is frequently inspected by scheme engineers and, overall, is in a good condition with regards to flood protection. Any areas where risk to stopbanks becomes imminent, emergency works will be completed. Non-urgent works to be completed this year include the replacement of the timber floodwall with rock riprap below Rangitikei Line, and assisting PNCC with the replacement or repair of their gabion baskets downstream of Tremaine Avenue Bridge. 8.34. Staff continue to manage enquiries and requests from the public and neighbouring residents regarding the Mangaone Reserve. This reporting period has included topics such as storm water runoff from the stopbanks and across properties, the formation of ‘sinkholes’ on neighbouring properties (thought to be due to storm water systems), vegetation trimming and tree removal requests. Trees which are causing damage to property or pose a risk to stopbank integrity are considered a higher priority for removal than those posing only a minor nuisance. 8.35. As a result of the current popularity of augmented reality games such as ‘Pokémon Go’, there has been anecdotal evidence suggesting an increase in private vehicular movements along the Mangaone Stream stopbanks. The stopbanks are being monitored and any damage repaired as necessary. This issue has brought forward the need for barriers to be installed at access points within the city where currently vehicular access is very easy.
MAKINO STREAM
8.36. Several areas of the Makino Stream had maintenance works undertaken, consisting of channel clearing of flood debris, and/or fallen trees, namely Rata Street, Reids Line and Boness Road.
DERBY CREEK
8.37. No works have been undertaken on Derby Creek this reporting period.
STONEY CREEK
8.38. No works have been undertaken on Stoney Creek in this reporting period.
MANGAORE STREAM
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Catchment Operations Committee 10 August 2016 8.39. Annual inspection of the scheme and all floodgates have been completed.
MOUTOA FLOODWAY
8.40. The annual inspection of all floodways, stopbanks and floodgates has been completed. Maintenance tasks have also been completed, including spraying of lime on the tops of the piers and removal of silt and debris from the apron.
TOKOMARU RIVER
8.41. Annual inspections of all assets including floodgates, have been completed. 8.42. During flood events, significant piping is evident along several parts of the Tokomaru River stopbanks. Much of this is attributed to the presence of large logs buried in the substrate layers below the stopbanks themselves. However, with the Rural Upgrade Project beginning in this area, information regarding the strength and stability of existing stopbanks is vital to the design and to ensuring the integrity of upgraded lengths. 8.43. In addition to the Foxton Loop site, Damwatch have also provided geotechnical advice on this issue. As a result, four test pits were dug along a 500 m length of berm on the upstream side of the Okuku Road Bridge known to have piping issues. Each of these sites provided evidence of piping through old vegetation at varying scales, within a similar substrate layer. Soil samples were also taken, to assist in stopbank composition and integrity investigations. In the coming weeks further investigations will take place.
LOWER KIWITEA STREAM SCHEME
8.44. One erosion site, resulting from last June’s flood, was repaired using a combination of tied tree works and permeable groynes.
KAHUTERAWA STREAM SCHEME
8.45. No works have been undertaken on the Kahuterawa Stream Scheme this reporting period.
ASHHURST STREAM SCHEME
8.46. As agreed at the last Annual Catchment Community Meeting, a programme of works was put together to replace the stock gates on the stream where recent flood protection works were completed. A further six stock gates have been constructed and installed this reporting period. This brings the total completed to 12. 8.47. An erosion site downstream of North Street was repaired using large concrete blocks. 8.48. The stream channel, downstream of Custom Street, was cleared of overhanging vegetation. 8.49. The following table schedules all current Rural Upgrade Project works and provides commentary on present project status. Project Title Description Status Manawatu River Right Bank Upgrade 4,700 m of stopbank on Survey is complete and design Stopbank Upgrade, Te Matai the right bank of the Manawatu work is in progress. Land entry Rd River adjoining Te Matai Rd, agreements have been sent to Whakarongo. affected landowners and negotiations are proceeding. Manawatu River Right Bank Upgrade 1,600 m of stopbank on Survey is complete and design Stopbank Upgrade, the right bank of the Manawatu work is in progress. Land entry
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Catchment Operations Committee 10 August 2016 Longburn Railway River along the railway line and agreements are currently being adjoining farmland east of prepared for affected landowners. Longburn. Meetings will then take place. Manawatu River Right Bank Upgrade 930 m of the Manawatu This work is carried forward from Stopbank Upgrade, DOC River right bank stopbank on 2015-16. A contract has been Reserve, Springs Rd, Department of Conservation awarded to Paranui Contractors Whirokino reserve land at two locations in the Ltd. The contractor will re-establish vicinity of Whirokino Rd and on site when ground conditions Springs Rd, Whirokino. permit. Manawatu River Left Bank Upgrade 200 m of the Manawatu Survey and design work will be Stopbank Upgrade, River left bank stopbank at undertaken along with Land entry Koputaroa Koputaroa. agreements in October. Manawatu River Right Bank Construct 35 m of concrete Survey and design work is Concrete Floodwall, Ervine floodwall on the Manawatu River complete. A contract has been Property, Rangiotu right bank at the Ervine property, awarded to ABC Contractors. Rangiotu. Work will commence on site when ground conditions permit. Oroua River Left Bank Upgrade 2,000 m of existing Survey is complete and design is Stopbank Upgrade, stopbank and construct 500 m of due to commence in August. Downstream of Awahuri new stopbank on the left bank of Horizons staff have contacted all Bridge the Oroua River immediately affected landowners and met on downstream of the SH3 Bridge at site with most. Land entry Awahuri. agreement documentation will remain on hold until design is complete and the full extent of works is better understood. Oroua River Right Bank Upgrade 1,300 m of existing Survey is complete and design is Stopbank Upgrade, stopbank and construct 800m of due to commence in August. Downstream of Awahuri new stopbank on the right bank of Horizons staff have contacted all Bridge the Oroua River immediately affected landowners and met on downstream of the SH3 Bridge at site with most. Land entry Awahuri. agreement documentation will remain on hold until design is complete and the full extent of works is better understood. Oroua River Left Bank Construct between 1,000 and The Catchment Information Team Stopbank Upgrade, 2,000 m of new stopbank on the are currently reconciling 2005 Upstream of Awahuri Bridge left bank of the Oroua River Lidar information to an established immediately upstream of the SH3 datum enabling an accurate Bridge at Awahuri. alignment to be determined. Survey work is programmed to follow this process. Oroua River Right Bank Construct 500 m of new stopbank The Catchment Information Team Stopbank Upgrade, on the right bank of the Oroua are currently reconciling 2005 Upstream of Awahuri Bridge River and Makino Stream Lidar information to an established upstream of the SH3 bridge at datum enabling an accurate Awahuri. alignment to be determined. Survey work is programmed to follow this process. Oroua River Left and Right Upgrade 3,000 m of existing Survey and design work are Bank Stopbank Upgrade, stopbank on the left and right currently in process along with Rangiotu banks of the Oroua River at negotiations with landowners and Rangiotu downstream of the leases over land entry Highway 56 Bridge to the considerations. Manawatu River confluence. Oroua River Right Bank Investigate the construction of a Engineering drawings have been Concrete Floodwall, Turks 2.6 m high concrete floodwall on completed but other options are Poultry, Rangiotu the Oroua River right bank currently being investigated due to stopbank adjoining the Turks a number of risk factors at this Poultry workshop. location.
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Catchment Operations Committee 10 August 2016 Linton Main Drain Left and Upgrade 1,000 m of existing An external surveyor familiar with Right Bank Stopbank stopbank on both banks of the HDC roading specifications has Upgrade, Tane Rd Linton Main Drain downstream of been engaged to carryout survey Tane Road. The right bank work commencing in August. involves undertaking road re- Meetings with landowners are construction work on the crest of currently in progress. the upgraded stopbank. Tokomaru River Left and Upgrade 4,300 m of existing Investigations into existing Right Bank Stopbank stopbank on both banks of the stopbank and foundation integrity Upgrade, Okuku Rd Tokomaru River from Okuku are currently in progress. Pumpstation upstream to Opiki Tendering for external survey Road. resourcing is also being considered. Meetings with affected landowners are in progress. Design is programmed for early September. Land entry agreement documentation will remain on hold until design is complete and the full extent of works is better understood. Mangaore Stream Left and Upgrade 2,700 m of existing Survey is complete and design Right Bank Stopbank stopbank on both banks of the work is programmed for early Upgrade, Shannon Mangaore Stream downstream of August. Meetings with landowners Otauru Road, Shannon. and negotiations over land entry considerations are currently in progress. Land entry agreement documentation will remain on hold until design is complete and the full extent of works is better understood. Protect Individual Property, Lift the Mason house at 943 Negotiations are currently in J.Mason, Lockwood Rd Lockwood Rd by 300 mm to a progress with the landowner. A height of RL 10.19 m. design professional has been engaged to resolve a number of construction issues around raising this house. Protect Individual Property, Provide flood protection to the Negotiations with the property Taonui Farms, Main Drain Taonui Farms dairy shed to a owners will commence in August Rd height of RL 10.19 m. 2016. Protect Individual Property, Provide flood protection to the Negotiations with the property Rangiotu Estates, Highway Rangiotu Estates dairy shed to a owners will commence in August 56 height of RL 10.19 m. 2016.
9. NORTHERN AREA
GENERAL
9.1. The long, dry, stable weather conditions experienced through autumn came to an abrupt end in June when winter rain saturated the soils and access to work sites became impossible. Up until this time the Northern area had completed an impressive volume of work and staff are happy with their accomplishments for the year. With the change in seasons we are now focused on asset inspections, end-of-year reporting and planning for the 2016-2017 year.
TRAINING AND FORUMS
9.2. Staff have been involved in several training opportunities this period including:
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Catchment Operations Committee 10 August 2016 AMS and Asset Inspections – refresher on using iPad inspection forms and processes.
COMMUNITY INVOLVEMENT
9.3. No community involvement meetings were attended during the reporting period.
RANGITIKEI RIVER CONTROL SCHEME
RANGITIKEI MAINTENANCE WORKS
9.4. Construction work has come to a stop as wet weather is now limiting access availability to work sites. There is about $70,000 of planned flood repairs to complete and work on these will begin again in the spring when ground conditions allow. At this time of year the emphasis changes and we are now focusing on collecting willow poles for the August/ September planting season. 9.5. A number of the rope and rail groynes installed over summer are being tested already with the higher winter river levels. The new installations at Mary Wilson’s property have been wet twice now and early indications show they are effectively lowering flow velocities against the erodible river bank. 9.6. We are very pleased with results from this year’s aerial spraying programme. Each year the build up of vegetation on river beaches and berms are sprayed to discourage permanent growth and enable the movement of gravel downstream. Loose gravel movement in the river reaches allows a natural meander pattern to occur without the formation of high gravel beds that divert flows into private property. 9.7. The NZTA project to upgrade the rock lining on the right bank upstream of the Bulls Bridge is progressing well. Work is now approximately 75% completed and the contractor must be applauded for the well managed work site. River Management staff continue to assist the contractor with river issues and providing communication links to the Bulls River Group. 9.8. The presence of the Giant Willow Aphid is now being noticed by the public as trees loose their leaves and the black honeydew stain on the stem is highlighted. There are concerns that many willows will not survive the winter and how loss in numbers will affect our river erosion protection capability. 9.9. On 8 June a Tangimoana floodgate exercise was held on site. A full installation of the gates was undertaken complete with road closure and public notification. These exercises are carried out yearly to ensure staff remain familiar with actions they need to take in an emergency and to identify improvements to the systems. 9.10. Staff attended a meeting with Reu Reu Road landowners and engineers from MDC to discuss management issues around the Waituna Stream Road Bridge. Gravel aggradation around the bridge piles, compounded with high debris loads during flood events, is encouraging the stream to deviate around the bridge. Horizons input is to work with landowners advising on stream bank vegetation clearance needs and have the Compliance Team investigate allegations of poor land management practices upstream during logging operations that now result in excessive debris during high flows.
RANGITIKEI CAPEX WORKS
PAREWANUI STOPBANK UPGRADE FOR 2016-17
9.11. Survey, design and drawings have been completed in preparation for upgrading a further 1 km of the Parewanui stopbank from river distance 5 km to 6 km. With major flood damage occurring as a result of the 20 June 2015 flood last year and the subsequent flood
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Catchment Operations Committee 10 August 2016 damage repairs to the stopbank toe, there was no stopbank upgrade work completed last construction season. A claim was submitted to MCDEM for this flood damage repair work and it is expected that the scheme will be reimbursed 60% of the total repair cost, $275,182. It is intended to add the estimated MCDEM payment of $165,110 to this year’s capex budget of $205,045, allowing approximately 1.35 km of stopbank upgrade work to be completed this coming construction season. This will go someway to catching up with the programmed work that had to be postponed from last year. Preparation for the contract documentation will be commencing very shortly, with the plan to commence construction work in November 2016.
PAREWANUI FLOOD PROTECTION UPGRADE PROGRAMME
9.12. Following the 2004 flood event, the Rangitikei River suffered severely from extensive flood damage and also serious flooding particularly in the Parewanui, Tangimoana and Scotts Ferry areas. In 2006, it was determined that the Parewanui stopbanks needed upgrading with a 15 year upgrade programme being approved; the current financial year constitutes Year 12 of that programme. It is intended to table a report at the November committee meeting providing a summary of how that project is tracking.
RANGITIKEI RIVER ENHANCEMENT
9.13. No enhancement work was undertaken this period.
GRAVEL EXTRACTION
9.14. No gravel extraction has taken place from Council’s consents in the reporting period.
POHANGINA-OROUA RIVER CONTROL SCHEME
POHANGINA RIVER
9.15. Future planning work is underway with the selection of suitable sites for pole planting. 9.16. Prices are expected soon for the proposed construction of a field willow nursery at the Bolton property near the Saddle Road Bridge. There is a shortage of good willow for pole harvesting in this area and the addition of a well laid out field nursery will reduce costs for the scheme. A large part of the costs for this work will be the installation of secure fencing and security as the area has a history of fly tipping and environmental damage due largely to its seclusion.
GRAVEL EXTRACTION
9.17. No gravel extraction has occurred during this period.
RAUMAI BRIDGE EROSION PROTECTION
9.18. For several years now concern has been expressed about the deterioration of the channel alignment in the Pohangina River immediately upstream of the Raumai Bridge. Prior to the June 2015 flood event, it was the engineers’ view that the dramatic and undesirable channel alignment at the site, resulting in a serious bank erosion on the right bank of the Pohangina River, could encroach and potentially sever the road access to the Raumai Bridge in one major flood event. 9.19. Designs were prepared and discussions were held with the MDC as to the impact of a flood event that could detrimentally affect their assets. Consequently, financial approval has now been given by MDC for HRC staff to manage the proposed contract. Staff have completed tender documentation, and currently tenders are being called. Tenders close
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Catchment Operations Committee 10 August 2016 on 4 August with a 12 week contract period to construct a major rock groyne and associated rope and rail groynes to mitigate future flood erosion to the right bank of the Pohangina River. The lengthy contract period is allowing for the difficulties in supply of rock that is currently being experienced.
TOTARA RESERVE
9.20. No work has been undertaken in this reporting period.
OROUA RIVER
9.21. The only construction work completed this reporting period was some Layered Tree Bank Protection Work (LTBPW) at the Griffith’s property in Almadale Road. The owners have expressed their appreciation of the work Horizons has organised at this site.
GRAVEL EXTRACTION
9.22. A total of 6005 m3 of gravel has been extracted from the Oroua River this reporting period.
UPPER WHANGANUI RIVER MANAGEMENT SCHEME
9.23. During this period the final few programmed maintenance and repair works were completed including; a small rock repair at Victory Bridge; the repairing of fences and the tidying and sowing of grass seed on the Turaki Street stopbank development project. Some stopbank mowing was also carried out. Finally, 150 tonnes of rock riprap was supplied and stockpiled in the Poole’s rock area in preparation for repair works next year.
TARINGAMOTU RIVER MANAGEMENT SCHEME
9.24. No work was undertaken this reporting period.
MATARAWA FLOOD CONTROL SCHEME
9.25. Rock is now delivered and stored on site at the Gudsell property. This will be used for the construction of a rock lining upstream of the diversion structure where erosion is threatening a section of stopbank. Work is expected to begin in August following the landowner approving the proposed work programme.
TUTAENUI FLOOD CONTROL SCHEME
9.26. The two significant studies currently in progress for the Tutaenui Scheme are progressing well, the first being a scheme audit that will review performance objectives against those delivered and also identify any optimisations that could provide a greater continuity of flood protection to the community. The second is an exercise looking at flood plain modelling, with a particular interest in flood mitigation options for Marton and Bulls. 9.27. Several property owners in the lower reaches of the river below Curls Bridge have conveyed their concerns about gravel build up since the June 2015 flood. In some areas this build up has had a detrimental effect on channel shape and flow carrying capacities resulting in more frequent flow over the berms. Staff will look at the feasibility of obtaining a global gravel extraction consent for the scheme to enable some better management of this problem. 9.28. Marton staff, with assistance from Council’s Compliance Team, are assisting a landowner in the upper catchment just below the Marton water supply dam deal with a problem of excess concrete rubble dumped in his paddock adjacent to, and in, the stream bed. Contractors working in Marton have used the site to rid themselves of concrete waste and
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Catchment Operations Committee 10 August 2016 deposited volumes far greater than approved by the owner. Unfortunately with the onset of winter conditions and the resulting wet paddocks it may be spring before this problem is resolved.
MAKIRIKIRI FLOOD CONTROL SCHEME
9.29. The intentionally breached section of stopbank on Richard Redmayne’s property was repaired in early June and will now provide winter flood protection. These repairs were delayed at the request of Mr Redmayne until after the harvest of his maize crop. 9.30. Also completed was the annual inspection and maintenance of floodgates including the removal of silt where required.
MAKIRIKIRI EGRESS GATE
9.31. Resulting from significant flood events in the Turakina River in October 2013, and again in June 2015, the need to construct a flood egress gate through the Makirikiri Scheme stopbank become a high priority. The flooding on both these occasions and particularly the latter event, closed the Turakina Beach Road for several days isolating the Koitiata community. During these large flood events floodwater from the Turakina River overflowed the surrounding farmland, eventually ponding against the outside of the Makirikiri Stream stopbanks. With no natural drainage options the rising flood level resulted in closing the Turakina Beach Road. To mitigate extended road closures the Makirikiri Stream stopbank was mechanically breached to quickly lower the flood levels ensuring the Koitiata community was not isolated and subjected to an unacceptable risk to their wellbeing. 9.32. The installation of the flood egress structure was seen as a good solution by allowing drainage to occur immediately. This will reduce road closure times to hours rather than days. At the same time the scheme’s flood protection capability is not compromised. 9.33. The revised funding requirements for this project are estimated at $125,000 with the largest share of nearly 60% being funded by the NZTA through the Rangitikei District Council (RDC). Horizons Regional Council will then fund a further 30% of the cost by way of environmental grant with the remaining balance being met by the landowner. The high level of financial support from NZTA reflects the importance of providing a largely retired and aged community with access to community services outside of their township. 9.34. Tenders were called in March 2016 with 15 sets of documents uplifted, but only two tenders were received at the closing date. The contract has now been let to ABC Contractors Ltd for a sum of $124,550 with an agreed start date for construction of 9 January 2017. By providing a lead-in time and constructing the egress structure during the summer months, considerable savings have been made. The contract period is six weeks. 9.35. Once constructed the flood egress gate will become a Makirikiri Scheme asset with inspections and maintenance undertaken by Horizons’ staff. 9.36. It must be noted, that a high level of collaboration was achieved between both councils and the property owner throughout initial project discussions. The outcome being a design that will greatly benefit the local community.
POREWA FLOOD CONTROL SCHEME
9.37. Large trees close to the stream in Hunterville continue to cause problems as they topple over into the waterway blocking flows. Access through private property to clear these obstructions is not easy with many landowners unwilling to allow the temporary removal of fences to allow the commencement of work. Both the time spent finding alternate access
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Catchment Operations Committee 10 August 2016 options and the extra distance then required to cart the debris from the waterway has increased costs to the scheme. 9.38. Work replacing the temporary Bailey Bridge at Te Hou Hou Road by the RDC is progressing well. River Management staff continue to maintain a close dialogue with the contractor to ensure work does not conflict with scheme activities.
WHANGAEHU MANGAWHERO RIVER MANAGEMENT SCHEME
9.39. Following this year’s recently completed channel clearing work programme, there remained some minor fencing repairs at the Riverlea Farm to be completed. This has now been completed.
TURAKINA RIVER MANAGEMENT SCHEME
9.40. Due to very wet weather and ground conditions some work programmed to be completed in June had to be postponed. This work was completed during July where three sites at Greene, Glasgow and Stewart’s properties were cleared of trees and debris blocking the river channel. In addition, approximately 300 m of channel and flood debris were cleared from the channel and banks at Greene’s property.
LOWER WHANGANUI VEGETATION MANAGEMENT AND FLOOD PROTECTION PROGRAMME
9.41. During June the monthly maintenance programmed works were completed at Upokongaro Jetty, Kowhai Park and Balgownie, this included culvert inspections and maintenance repairs, releasing of native plants and weed spraying in the Gilberd Street area of Balgownie and spraying of a length of bamboo infestation in the rowing club area.
PAKIHI SCHEME
9.42. No work was undertaken this reporting period.
FOREST ROAD DRAINAGE SCHEME
9.43. Following the spraying programme there was 2.2 km of mechanical drain cleaning undertaken this reporting period.
HAUNUI DRAINAGE SCHEME
9.44. The scheme drain spraying programme is now complete.
OTHER WORKS
NORTHERN ANNUAL SCHEME REPORT
9.45. Each year an Annual Report is prepared outlining the activities, and financial standing of the 14 schemes in the Northern area for the previous financial year. It is great to report that this document is now completed.
THE BIG FIVE
9.46. Currently one staff member is representing the Marton Service Centre on the Big 5 Strategy Group.
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Catchment Operations Committee 10 August 2016 ENGINEERING ADVICE
9.47. During the last two months there have been continued requests for advice on a variety of issues including rural flooding in non-scheme areas, involving clearing blocked culverts, clearing stream channels of vegetation and fallen trees, drainage issues and flood damage work. 9.48. One specific request on the Taringamotu has involved a major slip threatening property with staff involved in providing advice, assisting with resource consent applications, including working with Fish and Game New Zealand in the Waikato and securing approval for works to proceed with favourable outcomes for all parties involved. As soon as the resource consent has been granted the property owner will be able to proceed with this urgent repair work.
ENVIRONMENTAL GRANT WORK
9.49. As a result of the June and the September 2015 flood events there has been an increased level of requests for flood damage repair works. This year there have been 22 environmental grant applications made with repairs at 15 sites now completed, with a further four sites approved but have been postponed to next year, and three others that have been delayed by the property owners.
OTHER PROJECTS
MOAWHANGO RIVER
9.50. After a period of wet ground conditions all the slash heaps of trees and debris cleared from this year’s work site at the Duncan property was able to be burned. Genesis Energy have now been invoiced 100% for this year’s programmed work including staff time for the management of this project.
KOITIATA BUNDING
9.51. A joint project with RDC to provide a flood protection bund at the entrance to Koitiata Village has now been constructed and the carriageway was sealed in June. Historically a stream has overflowed its channel at the road bridge just before entering Koitiata. Floodwater has then been conveyed into the village along the roadway causing damage to properties on the eastern side of the community.
MISCELLANEOUS
9.52. From time to time properties with detention dams change ownership. Recently a new Licence Agreement was signed up with a new landowner on one of the Porewa Scheme detention dam sites. The Licence Agreement fee paid by Horizons acknowledges that the Council has rights under statute to enter the owner’s land at reasonable times with vehicles and other machinery or equipment in order to examine, clean, repair or otherwise maintain the existing dam and if necessary to reconstruct the dam and the works on the owner’s land. 9.53. The parties acknowledge that the owner’s land has been injuriously affected by the dam and the works, and have calculated the owner’s entitlement to full compensation for such injurious affection, and have fixed the licence fee in recognition of full compensation.
10. EASTERN AREA
GENERAL
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Catchment Operations Committee 10 August 2016 10.1. So far winter has been fairly mild, and while there have been several large downpours the Eastern rivers and streams have not flooded to any notable degree. 10.2. The highest total rainfall recorded in the Eastern catchment over the last two months was close to 400 mm which was recorded at the Upper Mangahao hydro recording site in the Tararua Ranges, much less than the typical 600 mm which fell during the same period last year. 10.3. During the last two months staff have been busy finishing off any remaining programmed works while also undertaking all the normal end-of-year tasks. Tasks including compiling asset inspections, updating the AMS with works completed and inspection records and collating claim summaries ready for the second claim to the MCDEM. 10.4. Staff have also been busy considering the feasibility of combining existing channel clearance activity into one larger district-wide scheme. The idea is that this will cover the entire Tararua area and afford staff the flexibility to manage channel congestion in a number of rivers and streams that are currently in need of attention and avoid establishing numerous small targeted rate schemes. 10.5. KiwiRail’s project to repair the Ngawapurua Rail Bridge has gained some momentum over the last two months. Divers surveyed the pads of the bridge in June and KiwiRail committed to underpinning a further six piers soon after. As part of this work KiwiRail will also investigate some potential substantial channel realignment works upstream of the bridge. The purpose of this is to align the Tiraumea River so that it flows more directly under the bridge rather than along the piers, relieving the bridge of unnecessary stresses. 10.6. Because the construction season has now come to an end only a small amount of gravel has been extracted over the last two months. A total of 2,100 m³ was extracted from the Tamaki River for use in roading and concrete projects. 10.7. A recent inspection of the Eastern area’s willow plantings have shown that the Giant Willow Aphid has started to disappear for winter, but that it has also caused a noticeable level of damage in some plantings. For this reason staff are interested to see how the population recovers after winter and are interested to see what the true effect has been on the plantings once they start to sprout in spring. In the meantime, staff continue to stay in contact with the Willow and Poplar Collective to learn more about the problem. In the short-term however, the intention is to manage risk by planting bigger poles this coming season, as bigger willow poles appear to handle the stress of the Giant Willow Aphid much better than the smaller ones.
AKITIO SCHEME
10.8. Generally the Akitio catchment has remained fairly dry throughout the last two months and while a reasonable rainfall event at the end of June was not enough to cause any flooding, it was welcomed by the landowners. 10.9. As stated in the last bi-monthly, this has been a season of reduced works for the Akitio and as such, there were no works completed this reporting period. This means that the only work to be completed this season was the Old Mans Beard (OMB) poisoning which was carried out in March. While the work appears to have been successful, staff are aware that there will still be an abundant amount of seed still in the soil that will require ongoing maintenance. 10.10. Current inspections indicate that the scheme is in a good position going into winter. However going forward, staff will continue to monitor the river for willow debris while also monitoring the debris accumulation at the river mouth. This is to be done in accordance with the agreement made earlier in the season with local landowners. To date, inspections of the beach show that this material continues to do a good job of protecting the vulnerable foreshore from wave action.
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Catchment Operations Committee 10 August 2016 EASTERN MANAWATU SCHEME
10.11. Like the Akitio, the Manawatu has been relatively settled over the last two months, the only exception has been a fresh which occurred in early July aiding the river to rise to 4 m at the Weber Road (Dannevirke) recording site. While 4 m is a reasonable fresh, staff have been pleased to find that there were no problems that occurred as a result of it. In fact, this could actually be seen as a good sign because given that this is the highest the river has been since September and no debris were mobilised, it possibly indicates that a lot of the abundant decaying willow has either now rotted or passed through the system indicating that we are over the initial hump of debris release. 10.12. Over the last two months staff have finished off programmed works, prepared for planting and undertaken a thorough inspection of the entire channel. The works included some ringbarking undertaken in two locations on the outsides of bends, and was done to remove the mass of trees while keeping the roots intact. 10.13. The scheme is in a good position going into winter, but staff will continue to undertake inspections for debris dams or any issues that might arise as river levels continue to fluctuate over the winter period.
IHURAUA SCHEME
10.14. Ongoing inspections show that the Ihuraua Stream channel is still clear and free flowing. Previous years’ efforts to clear the constrictions that were identified in the 2011 scheme audit have clearly been of benefit. As such, this stream is in a good position going into winter and staff will continue to monitor its condition over the coming months.
MANGATAINOKA SCHEME
10.15. Over the last two months staff have focused on completing any remaining programmed works, while also beginning preparations for the coming season’s planting works. The works completed were Tree Bank Protection Work (TBPW), two sites of rope & rail groynes and the cleaning of a short section of scheme drain. 10.16. As mentioned in the past, this season’s programmed works included $389,000 worth of extra flood damage repairs and funding requiring the reprioritisation of $159,000 worth of budgeted funds, as well as the addition of $230,000 worth of emergency reserve funds. However, while this will still be the case to some degree in the short-term, the subsequent claim to MCDEM will likely make close to $155,000 being available in the coming season to help reduce the overall impact. 10.17. No gravel was extracted from the Mangatainoka River this reporting period. 10.18. Staff have also been investigating and planning a programme of works to help alleviate the ongoing flooding problems caused by the Mangaramarama Stream, north of Pahiatua. Proposed works include the realignment of one meander, the excavation of two overflow channels and a short stopbank to redirect the worst of the flood waters around several properties. A small amount of survey has been completed and the Design and Investigations Team have produced figures indicating a positive effect on channel capacity if these proposals are implemented. A staged approach to the works has been adopted to make the works affordable. It is anticipated work on the upstream overflow and channel realignment will be undertaken in the coming financial year once consent has been granted.
SOUTH EASTERN RUAHINE SCHEME
10.19. Although river levels had started to fluctuate over the last couple of months all programmed works were able to be completed and pleasingly this has put the scheme in a good position
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Catchment Operations Committee 10 August 2016 going into winter. This has been quite a feat given that the season’s works budget was almost three times the original as a result of the June 2015 flood. 10.20. Further to this, it has also been pleasing to have completed all of the flood damaged works which are to be claimed for (through MCDEM). This means the scheme can now put the claim process behind it and focus on a more normal works programme next season. 10.21. As mentioned in the past, this scheme’s original works programme included $421,911 worth of flood damage repairs and funding requiring the reprioritisation of the existing works budget, as well as the addition of $357,500 worth of emergency reserve funds. However, while this will still be the case to some degree in the short-term, the subsequent claim to MCDEM will likely make close to $78,000 available in the coming season to help recuperate some of the flood damage costs. 10.22. During the last two months 2,100 m³ of gravel was extracted from two sites on the Tamaki for use in concrete and roading projects. This was taken from a location identified by the Scheme Manager, as aggrading and needing gravel removal to help alleviate flooding and erosion problems. 10.23. Going forward, staff will be busy undertaking the planting programme while continuing to carryout inspections to help keep the coming seasons’ works programme up-to-date.
TAWATAIA - MANGAONE SCHEME
10.24. As with the Ihuraua, ongoing inspections indicate that the scheme is in a good position going into winter with all channels conveying flood waters very well as a result of this season’s efforts. 10.25. Going forward staff will continue to monitor channel performance over winter in preparation for next year’s works.
UPPER MANAWATU/LOWER MANGAHAO SCHEME
10.26. The works programme for the Upper Manawatu/Lower Mangahao Scheme was completed last period. This period staff have focused on finalising accounts for the end of the financial year, preparing summaries of works to be included in the second MCDEM claim, inspecting and recording asset conditions while also preparing the planting programme for the coming season. 10.27. Fourteen of the 20 flood damage works which are to be claimed for (through MCDEM) are now complete, meaning there are only six still remaining to be undertaken in the coming financial year. 10.28. As mentioned earlier, works this year have included $172,548 worth of flood damage repair funded through reprioritising existing works funds as well as the addition of $128,245 worth of emergency reserve funds. However, while this will still be the case to some degree in the short-term, the subsequent claims to MCDEM will likely make close to $80,000 available in the coming season to help minimise the overall impact on the scheme. 10.29. No gravel was extracted from the Upper Manawatu or Mangahao Rivers this period. 10.30. Going forward, staff will be busy undertaking the planting programme while continuing to carryout inspections to help keep the coming season’s works programme up-to-date.
ENVIRONMENTAL GRANT WORKS AND ENGINEERING ADVICE
10.31. There have been few new enquiries for environmental grant assistance this reporting period. The only work to be undertaken this period was a small length of bank protection taking place on the Mangaroa. This piece of work was the last of six pieces of grant work
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Catchment Operations Committee 10 August 2016 to be undertaken this season. While there were two other grants applied for, both have been cancelled as the landowners have since decided not to follow-up on the works.
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Catchment Operations Committee 10 August 2016 11. SOUTHERN AREA
GENERAL
11.1. The weather over this period has been fairly unsettled which has kept staff busy ensuring that the drainage networks and pump stations are operating effectively. 11.2. Ongoing unsettled weather has seen large amounts of weed brought down to many of the scheme’s pump stations. Staff and contractors have been kept busy going around the scheme pump stations clearing the weed build up to ensure effective running of all pump stations. 11.3. The last of the scheme asset inspections have been completed and over the next month staff will be inputting the information they have obtained from these inspections into the AMS. 11.4. Staff attended a community meeting held by HDC updating residents from around Fairfield and Kimberley Roads on the progress being made around a solution to flooding issues in the northern part of Levin. HDC staff indicated at the meeting that they hope to complete all of their investigation work and consultation with the local landowners along the Koputaroa Stream by the end of August at which point, they will apply for resource consent from Horizons to increase the amount of stormwater discharge from Levin into the Koputaroa Stream. 11.5. A preliminary meeting has been held with staff from HDC to discuss the storm water and flooding issues around the Foxton township. A further meeting took place on Monday 25 July discussing issues with staff of HDC and members of the Foxton Community Board to try and identify the level of service that is expected from the Foxton community and to look into options to improve the current situation if the community desires to do so. 11.6. Staff have obtained design drawings and costs estimates from one of the local engineering firms who has been working with staff to mitigate the Health and Safety issues identified and reported previously that relate to the Cooks Pump Station. Efforts are being made to obtain additional estimates before awarding the work to a preferred supplier however, to date, these efforts have been unsuccessful.
OHAU-MANAKAU SCHEME
11.7. While the period has seen some consistent rainfall, the streams and rivers in the Ohau- Manakau Scheme have been reasonably quiet. The highest flows for this period occurred on 12 June with the Ohau peaking at 1.8 m (140m³/s). The highest flows in other channels are as follows: Waikawa with 1.4 m (58m³/s) and Manakau with 2 m (15m³/s). 11.8. The remainder of the period saw low flows with the next highest event being less than a third of the above. 11.9. Work during this period saw erosion protection undertaken on the Ohau at Hazlitt’s property. A minor realignment of the channel due to gravel build up saw the need for concrete riprap being placed to prevent further erosion. 11.10. A total of 1.5 km of drain machine cleaning occurred during the reporting period.
MANAWATU DRAINAGE SCHEME
11.11. Along a 100 m section of Whiskey Creek concrete was placed to repair a washout through Paul Argyle’s property. 11.12. Throughout this period large weed build up has formed at the Burkes Drain outlet, requiring machinery to remove the blockages. Failure to remove the blockages would impact on the
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Catchment Operations Committee 10 August 2016 drains gravity drainage and could prevent the floodgates closing in the event of a rise in the level of the Manawatu River. 11.13. Along a 600 m section of the Taonui Stream trees that had been restricting the flow in the channel were removed. 11.14. A 400 m section of Roberts Drain was machine cleaned through Argyle’s property. 11.15. A 1.1 km section of the old Mangaone Drain was machine cleaned and large trees that had been growing in the channel were removed. 11.16. In addition, a long reach digger was used to machine clean Tyacks Drain between the river and LMS stopbank.
MAKERUA DRAINAGE SCHEME
11.17. A warm autumn and early winter has seen continued weed growth in a number of scheme drains in particular those discharging to scheme pump stations. This has resulted in the need to mechanically clean a number of scheme drains to aid the flow of water. 11.18. A slump formed in Subway Drain restricting the flow of water; this has now been removed. 11.19. L10 floodgate along Linton Main Drain has been replaced after the gate was accidentally damaged during machine cleaning of the drain. 11.20. A long reach excavator was used to clear a section of Lagoon Drain from stopbank to river in order to release water. This was required so that a damaged floodgate could be inspected and repaired.
KOPUTAROA DRAINAGE SCHEME
11.21. A reported fault with the submersible at Koputaroa No. 4 Pump Station resulted in the pump being pulled so a visual inspection of the pump could be undertaken. The inspection revealed that weed had become trapped in the impeller preventing it from turning resulting in the pumping tripping out on overload. The weed was quickly removed and the pump reinstalled. 11.22. Koputaroa No.1 Pump Station required work on its door to ensure it would not jam. 11.23. As part of the scheme’s drain maintenance program, a number of scheme drains were mechanically cleaned.
MOUTOA - WHIROKINO DRAINAGE SCHEME
11.24. In order to improve access to the Whirokino Pump Station a new track has been constructed along the top of the stopbank. In previous years, the track to the pump station could be dangerous during winter with the possibility of getting vehicles stuck or sliding off the edge of the stopbank. To construct the track, metal was carted in, placed and compacted along the top of the stopbank and around the pump station. Large concrete blocks were also used to retain some of the bank around the pump station entranceway. 11.25. Work has been undertaken on the door into the Kerekere Road Pump Station to ensure it would not jam. 11.26. Temporary work has been carried out to repair the floodgate for the small Pleuger Pump Station after a number of the timber boards on the gate disappeared. New boards have been fitted to repair the gate however, since it is not the first time this has happened, a decision has been made to replace the entire gate with solid plastic. This replacement is programmed to be completed during the next reporting period. 11.27. As part of the scheme’s drain maintenance program, a number of scheme drains had been sprayed with herbicides to control the growth of submergent weed in a number of the main
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Catchment Operations Committee 10 August 2016 pump drains. A warmer than normal autumn has seen weed growth in many of these drains continue well into winter when normally it would be dying off. However, before the spray could take full effect a prolonged period of rain resulted in the need to put machinery into a number of drains and this has in turn impacted on the year end financial position.
TE KAWAU DRAINAGE SCHEME
11.28. A warm autumn and a poor result from some of the chemical spraying that had been done earlier in the period has seen a number of scheme drains requiring mechanical cleaning due to a high build up of weed, which was preventing water draining. 11.29. A floodgate outlet into the Johnson’s extension has been repaired. This was due to significant rusting of the hinges causing one side to hang in the water. 11.30. A new culvert and gateway was installed at Amon’s Drain in Craw’s property boundary, to make it easier for the spray truck to spray Amon’s Drain. A desire to install a boundary gate along scheme drains was expressed at the recent Catchment Community Meeting so hopefully this is the first of a number of gates to be installed over the coming periods. 11.31. A 1.9 km section of Longburn Drain had a large amount of weed build up requiring mechanical cleaning. Digger and trucks were required to clear the drain along Rongotea Road between Johnson’s Drain to Kopane School. 11.32. A 2.5 km section of Mill Drain was machine cleaned this reporting period.
HOKIO DRAINAGE SCHEME
11.33. A large willow tree was removed from the upstream side of the bridge leading to Hokio Beach. Branches from the tree had been leaning into the stream and catching debris which was floating down the stream.
12. ENVIRONMENTAL GRANT WORK
12.1. The status of grants approved during the 2015-16, together with those approved during the previous financial year but deferred, is as shown in the table below:
Name River Type of Work Date Work Estimated/ Value of Approved Status Actual Grant Works Cost ($) N Tripe and Mangatipona Grade control 30/4/2015 Completed $26,292 $7,888 T Mathews Stream repairs
Blackfern Ongarue River Remove debris 12/8/2015 Completed $1,800 $540 Lodge blockages
M&N Porewa Erosion 21/9/2015 Completed $7,962 $2,388 Stewart Stream protection
C Waituna Erosion 21/9/2015 Completed $15,345 $4,604 Williamson Stream protection
S Dittmer Kiwitea Erosion 21/9/2015 Completed $5,195 $1,559 Stream protection
E Brook Kiwitea Erosion 21/9/2015 Completed $16,633 $4,990 Stream protection
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Catchment Operations Committee 10 August 2016
C Nagel Tutaenui Erosion 21/9/2015 Completed $5,852 $1,756 Stream protection
D Porewa Erosion 30/10/2015 Completed $10,673 $3,202 Voelkerling Stream protection
Kym Black Oroua River at Erosion 30/10/2015 Carry over to $13,000 $3,900 Rangiwahia protection 2016-17 estimated estimated
W Blakely Porewa Erosion 16/12/15 Completed $32,078 $9,623 Stream protection
Fullerton- Tutaenui Erosion 2/12/15 Completed $16,575 $4,973 Smith Stream protection
Curwen Kiwitea Erosion 16/12/15 Completed $7,019 $2,109 Hare Stream protection
Redmayne Mangatikotoko Channel grade 5/2/2016 Completed $53,377 $16,013 Stream control Turakina C Hayes Tutaenui Erosion control 30/3/2016 Completed $11,536 $3,461 Stream
RDC Koitiata Flood protection 21/4/2016 Completed Grant contribution not required.
Alex & Sue Kiwitea Bank Flood 4/5/2016 Completed $1,689 $507 McKay Stream Damage Repairs N Randell Tutaenui Erosion Control 24/5/2016 Yet to $7,000 $2,100 Stream commence Estimated Estimated
Tunnel Hill Makirikiri Flood water 29/7/2015 Yet to $124,550 $37,365 Stream egress structure & 2/6/2016 commence. estimated estimated
Bird and Kiwitea Erosion 31/7/2015 Completed $2,962 $890 Brown Stream protection
J Heald Manawatu Erosion 4/9/2015 Completed $23,628 $7,102 River at Oringi protection
N Short Tapuata Erosion 21/9/2015 Completed $6,959 $2,088 Stream protection
K Norman Upper Erosion 17/7/2015 Completed $5,166 $1,550 Mangahao protection River G Bennett Upper Erosion 12/6/2015 Completed $19,701 $5,910 Mangahao protection River Pongaroa Pongaroa Erosion 4/2/2016 Completed $8,737 $2,463 Way –To-Go River protection/ Community channel control Group Jarrod Mangaroa Erosion control 1/3/2016 Completed $6,300 $1,890 Drysdale Valley estimated estimated
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Catchment Operations Committee 10 August 2016
Hooper- Mangatoro Erosion 4/2/2016 Works now $8,000 $2,400 Smith and Stream protection on hold and estimated estimated Taylor to be completed next FY. Total Estimated Grant Commitment To Date $131,271
12.2. The Annual Plan budget for environmental grants (Rivers Fund) for the 15-16 financial year was $60,000. Having considered a paper to the Strategy and Policy Committee on 8 December 2015, Council approved an additional $50,000, giving a total budget of $110,000. 12.3. While that budget appears to be over committed (refer table above), a handful of projects, most notably the Makirikiri gate structure, will not commence until next financial year. The year end result will therefore be around $95,000.
13. SIGNIFICANCE
13.1. This is not a significant decision according to the Council’s Policy on Significance and Engagement.
Ramon Strong GROUP MANAGER RIVER MANAGEMENT
ANNEXES A Schedule of Completed Wokrs 1 June - 31 July 2016
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