I hereby give notice that an ordinary meeting of theCatchment Operations Committee will be held on: Date: Wednesday, 14 December 2016 Time: 9.00am Venue: Tararua Room Horizons Regional Council 11-15 Victoria Avenue, Palmerston North CATCHMENT OPERATIONS COMMITTEE AGENDA MEMBERSHIP Chair Cr DB Cotton Deputy Chair Cr LR Burnell QSM Councillors Cr JJ Barrow Cr EB Gordon JP(ex officio) Cr RJ Keedwell Cr PJ Kelly JP Cr GM McKellar Cr NJ Patrick Cr PW Rieger QSO JP Cr BE Rollinson Cr CI Sheldon Cr WK Te Awe Awe Michael McCartney Chief Executive Contact Telephone: 0508 800 800 Email: [email protected] Postal Address: Private Bag 11025, Palmerston North 4442 Full Agendas are available on Horizons Regional Council website www.horizons.govt.nz Note: The reports contained within this agenda are for consideration and should not be construed as Council policy unless and until adopted. Items in the agenda may be subject to amendment or withdrawal at the meeting. for further information regarding this agenda, please contact: Julie Kennedy, 06 9522 800 CONTACTS 24 hr Freephone : [email protected] www.horizons.govt.nz 0508 800 800 SERVICE Kairanga Marton Taumarunui Woodville CENTRES Cnr Rongotea & Hammond Street 34 Maata Street Cnr Vogel (SH2) & Tay Kairanga-Bunnythorpe Rds, Sts Palmerston North REGIONAL Palmerston North Wanganui HOUSES 11-15 Victoria Avenue 181 Guyton Street DEPOTS Levin Taihape 11 Bruce Road Torere Road Ohotu POSTAL Horizons Regional Council, Private Bag 11025, Manawatu Mail Centre, Palmerston North 4442 ADDRESS FAX 06 9522 929 Catchment Operations Committee 14 December 2016 TABLE OF CONTENTS 1 Apologies and Leave of Absence 5 2 Public Speaking Rights 5 3 Supplementary Items 5 4 Members’ Conflict of Interest 5 5 Tuatenui River Scheme Audit (PRD 05 30) Report No: 16-240 7 6 Rangitikei River Scheme - Parewanui Flood Protection Upgrade Project - Project Review and Work Programme - August 2016 (PRD 5 28) Report No: 16-241 13 Annex A - Works completed to date. 17 Annex B - Plans and Long-Sections 18 7 Monitoring and Surveillance of Council-Owned Dams (OAM 02 00) Report No: 16-242 21 8 River and Drainage Engineering Report (PRD 01 02) Report No: 16-239 25 9 Whanganui Flood Management Review Group Update (PRD 05 34) Report No: 16-246 65 10 Lower Manawatu Scheme (LMS) Rural Upgrade Project - Project Review And Work Programme for 2016-17 (PRD 5 35) Report No: 16-243 71 11 Sustainable Land Use Initiative (SLUI) Report No: 16-244 79 Annex A - SLUI Overview and Plan Progress 93 12 Regional Coast and Land Report No: 16-245 95 13 Members’ Questions Page 3 Catchment Operations Committee 14 December 2016 AGENDA 1 Apologies and Leave of Absence At the close of the Agenda no apologies had been received. 2 Public Speaking Rights Notification to speak is required by 4pm on the working day prior to the meeting. Further information is available by phoning 0508 800 800. Petitions/Deputations Deputations: Written notice (fewer than 150 words) concerning the nature of the deputation must be lodged with the Chief Executive at least 2 working days before the date of the meeting and subsequently approved by the Chairperson. Petitions: Written notice to the Chief Executive is required at least 2 working days before the date of the meeting. Further information is available by phoning 0508 800 800. 3 Supplementary Items To consider, and if thought fit, to pass a resolution to permit the Committee/Council to consider any further items relating to items following below which do not appear on the Order Paper of this meeting and/or the meeting to be held with the public excluded. Such resolution is required to be made pursuant to Section 46A(7) of the Local Government Official Information and Meetings Act 1987 (as amended), and the Chairperson must advise: (i) The reason why the item was not on the Order Paper, and (ii) The reason why the discussion of this item cannot be delayed until a subsequent meeting. 4 Members’ Conflict of Interest Members are reminded of their obligation to declare any conflicts of interest they might have in respect of the items on this Agenda. Page 5 Catchment Operations Committee 14 December 2016 Report No. 16-240 5 Decision Required TUATENUI RIVER SCHEME AUDIT (PRD 05 30) Item 1. PURPOSE 1.1. The purpose of this item is to report the findings of the Tutaenui Scheme Audit and to seek the Committee’s approval for the release of the report to scheme stakeholders. 2. RECOMMENDATION That the Committee recommends that Council: a. receives the information contained in Report No. 16-240. b. approves the release of the Audit report to scheme stakeholders for comment. 3. FINANCIAL IMPACT 3.1. Budget provision for the work involved in undertaking the Scheme Audit was scheduled for 2015-16 and some costs were carried-over to the 2016-17 Annual Plan (AP). The Audit report does contain recommendations that have financial implications although some (dam safety) are already budgeted for in the draft 2017-18 AP. Others generally require further investigation and these will be added to the overall investigations programme. It is not intended to make any other specific provision ahead of the considerations required as part of the update to the Long-Term Plan (LTP). 4. COMMUNITY ENGAGEMENT 4.1. Once the draft report is received by Council, a synopsis of the report will be presented to the Scheme Liaison Committee for feedback, followed by referring the findings to the wider stakeholder group by way of a newsletter. 5. SIGNIFICANT BUSINESS RISK IMPACT 5.1. There are no significant business risk matters inherent in the adoption of recommendations contained in this report. 6. BACKGROUND 6.1. The Tutaenui Scheme was established by the Rangitikei Catchment Board in 1976 with support of the Marton Borough Council, Rangitikei District Council and the Bulls County Council. 6.2. The scheme was established following years of frustrating attempts to control flooding and manage the stream channels within the catchment. The scheme established 15 detention dams and undertook a programme of capital works on the major stream channels to control flooding and clear channel congestion. Three dams in the small catchments to the west of Marton that had been constructed by the Marton Borough Council in 1962-63 became scheme assets in 1976. Tuatenui River Scheme Audit (PRD 05 30) Page 7 Catchment Operations Committee 14 December 2016 6.3. The primary objective of the scheme is to protect the townships’ of Bulls and Marton and 5 surrounding rural land from flooding. The scheme is located on the catchment of the Tutaenui Stream, which has its headwaters to the north of Marton. The catchment is 13,600 ha in size and generally lies in a north-south direction, rising to 300 m in its Item Item headwaters. The entire catchment area has been developed for farming. 6.4. The stream joins the Rangitikei River 3.5 km downstream of the SH 1 Bridge. The scheme manages 26.6 km of the 28.7 km of the main Tutaenui Stream channel (commencing 2.1 km upstream of Calico Line) along with the Marton West Drain and 3.5 km of the Folley and Panui Streams, which flow through the urban areas of Marton. The Henrietti Drain at Bulls is also managed by the scheme and upstream of SH 3, to the west of Bulls, a floodway was constructed as part of the scheme. Its role is to guide floodwater breakouts above the highway back to the stream some 500 m downstream of the highway. Extensive drainage works have also been carried out on the outskirts of Bulls to divert drainage water away from the urban area. 6.5. The purpose of the dams has been to reduce the size of the flood flows in the Tutaenui Stream and in some of the smaller side streams within the Marton urban area, and thus reduce the extent of flooding from these streams. The scheme was designed to manage the flows during a 20-year rainfall event and thus limit the flooding during such an event. 6.6. Since the substantial capital works were completed in 1985, a relatively low level of maintenance activity has been undertaken annually. It largely involves regular inspection and maintenance of detention dam flow control structures, clearance of obstructions to flow in the Tutaenui Stream channel, and chemical or mechanical maintenance of scheme drains. 6.7. The 1989 Local Government reform resulted in the Rangitikei-Wanganui Catchment Board being abolished and its functions being taken over by the Manawatu-Wanganui Regional Council (Horizons). Responsibility for the management of the Tutaenui Flood Control Scheme passed to the Regional Council. 6.8. The scheme has a high level of community support, as evidenced by the attendance of ratepayers at meetings, and the active participation of a Scheme Liaison Committee consisting of nine ratepayer representatives. 6.9. In April 2006, a full Scheme Review was completed by an external consultant (referred to as the 2006 Review). The 2006 Review made several recommendations on stream channel maintenance and dam management. The latter recommendations were largely based on those contained in an earlier engineering consultants assessment made in 1997. 6.10. Over the period 19 to 21 June 2015 the Tutaenui Stream experienced a major flood event, measured at 70 cumecs at the Hammond Street gauge in Marton. The peak flow was 70 cumecs at the Tutaenui at Hammond Street gauge. This was a 1.7% AEP (1 in 60 year flood). 6.11. There were significant overflows from the Tutaenui Stream and tributaries.