DRAFT LTP book.indb - Hurunui District Council

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www.hurunui.govt.nzActivity 1: Stormwater and DrainageOverviewThe Stormwater and Drainage activity includes the variousfunctions of land drainage schemes and fl ood protection.Current SituationWe maintain four small land drainage schemes set up by theformer North Canterbury Catchment Board. They are theAshworths drains, Leithfi eld Outfall drain, Newcombes Roaddrains and the Jed River areas.We have only a very small quantity of stormwater pipes inour townships, as most stormwater is disposed of to kerb andchannelling and open drains. There are approximately 100 metresof stormwater pipe in Hanmer Springs and approximately 560metres of pipe in Amberley. Much of the District’s stormwaterdisposal systems comprise infrastructure that is maintained byprivate individual property owners, such as on-site soakagedisposal, open drains/creeks, piped networks outfalls, silt traps,and detention structures.After two signifi cant rainfall events in and around Amberley in2008, we engaged a specialist consultant to review the adequacyof ourstormwater systems. The recommendations were to carryout some major capital works to reduce the impact of surfacefl ooding on both Amberley Township and Amberley Beach. Theworks were to include diversion drains to “behead” the surfacefl ows from north of Amberley to discharge them to naturalwaterways outside the urban area, and realignment of drainsdischarging to the lagoons north and south of Amberley Beach.Because of the time taken to obtain resource consents,exacerbated by the Canterbury earthquakes and appeals lodgedagainst the consents granted after a lengthy hearing, only twomajor physical works have been completed. These were thefl ood diversion from Dock Creek along Lawcocks Road, and apiped outfall of the Leithfi led Outfall Drain to the sea.However with consents now fi nalised for three more signifi cantcapital projects, work is expected to be completed for fl ooddiversion works in the Amberley swamp area (to include anoutlet culvert under Stanton Rd) and from Dry Gully across toMimimoto lagoon before the end of the 2011/12 year.Plans for the futureA fl ood fl ow diversion from Eastern Drain across to theAmberely North lagoon is proposed for the 2012/13 year tocomplete the fl ood mitigation works covered by the 15 consentsmentioned above.Detailed design and land ownership issues still have to be fi nalised,but a preliminary estimate of $298,000 has been allowed forin the 2012/13 budget for this work and a further $84,000 inthe 2016/17 budget for unspecifi ed improvements. All funding isfrom a special rate struck over the entire Amberley Ward.A global consent for discharge of stormwater from the AmberleyUrban area was heard in 2011, along with the other 15 consentsfor fl ood mitigation works described above. This was put onhold pending as there was not enough information and a newapplication will be made in the 2012/13 year.AECOM Consultants will fi nalise an application in the 2012/13year for a global consent for management of stormwaterfrom future residential developments in Hanmer Springs. Inanticipation of the stormwater management plan identifying someminor capital works being required on existing infrastructure, anallowance of $62,000 has been made in the 2013/14 year anda further $69,000 in the 2016/17 year. As in Amberley this willbe funded by a separate rate over all properties in the HanmerSprings Ward.We are proposing a new stormwater engineer to be appointedin 2013/2014 to manage this area of our work. This engineerwill be responsible for developing district-wide stormwatercatchment and management plans, and undertake the range oftasks required to ensure we have effective stormwater systemsin place, inclusive of appropriate maintenance regimes.We will progressively move towards managing all of its urbanstormwater responsibilities in a more holistic, integrated andlife cycle way.FundingOperational Costs:• 100% Targeted Rate based on the area benefi ting.• Engineer for stormwater catchment and managementplans funded through the General Rate.Capital Costs:• Signifi cant Council capital expenditure is funded by aloan as per the Council’s Internal Financing Policy.• If loans are not raised, then it will be from targetedrates.• If any of the Capital Expenditure caters for futuregrowth of the scheme, then that portion of theexpenditure that relates to growth may be fundedfrom future users via Development Contributions andFinancial Contributions.86
Draft Hurunui Community Long Term Plan 2012 - 2022Council Owned AssetsLand drainage schemes:• Ashworths drains• Leithfi eld Outfall drain• Newcombes Road drains• Jed River drainsMaintenance and Operating ImplicationsWe plan to continue to maintain the 4 drainage systems as wellas other drainage channels created as part of the improvementworks described above. Annual maintenance has been limited tooccasional drain clearing. Contractors will be engaged to carryout regular work to maintain the system as and when needed.Assumptions and RisksIt is assumed that both global consent applications (Amberleyand Hanmer Springs) will be approved and that land-ownerapprovals will be given to allow the fl ood mitigation constructionworks to proceed.Community Outcomes1. A desirable and safe place to live2. A place with essential infrastructureGoals and Performance MeasuresGoalsMinimise the risk offl oodingHow we will achieve ourGoalsMaintain all drainagesystems in accordance withresource consent conditionsEmploy an engineer tomanage the stormwater anddrainage portfolioPerformance Measures Current Situation 11/12 12/13 13/14 14/15 15+All major and signifi cantnon-compliances for ourstormwater resourceconsents reduce until wehave 0% non-complianceDistrict wide stormwatercatchment and managementplans have been putin placeWe have 30 resourceconsents relating tostormwater, which have 363conditions to comply with.We have had 0% major andsignifi cant non-compliance sofar this year.We have a stormwater planfor the Amberley area butnot for the other areas in thedistrict2% 1% 0% 0%√Financial SummaryA fi nancial summary for this activity is shown on the next page.87
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DRAFT LTP book.indb - Hurunui District Council

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