Marlborough District Council Roading Assets - Activity Management Plan 2015 - 2018 SECTION 1 EXECUTIVE SUMMARY Under the previous AMP the worst condition kerb and channel has been gradually renewed, eliminating the kerb and channel in a very poor condition, level (5), as identified in the condition rating survey 2010/2011. Current funding levels for subsidised renewals is fixed at $390,000 from 2014/2015 until 2017/2018, based upon a renewal rate of $150 per/m this will give a yearly renewal rate of 2.6km, it is therefore forecasted that all condition 4 asset would be in renewed (7.3km) in 3.0years by 2017 / 2018, leaving the remaining asset in a condition of 3 or greater. As described earlier in this section a comprehensive condition survey was carried out in 2010 / 2011 in the urban areas of Blenheim and Picton and is proposed to undertake another condition rating survey of surfaced channels in the main urban areas again in 2015. All kerb and channel renewals are economically justified as being the least cost maintenance option in accordance with the NZTA economic evaluation manual. Capital The Council has an ongoing kerb and channel installation programme for urban streets which are currently serviced by unlined drainage channels and road approaches into new sub divisions. New installations are unsubsidised. 1.6.3.5.2 Culverts The large number of different pipe and drain types, sizes and locations recoded in RAMM, together with incomplete information as to age and performance make any measure of life expectation difficult. A continuation of the collection of condition data and programmed response to damage findings is a very reasonable mechanism for the management of drainage facilities. Marlborough Roads has an ongoing upgrading programme, culverts are constantly being replaced and are often relocated. The upgrading programme is that all existing culverts are replaced with concrete, steel / aluminium and plastic, these new culvert types will perform better over a longer time period and under changing site conditions. Council has a significant culvert stock of some 6,043 culverts. Based on a 50 year life cycle, renewal / replacement programme, 2% or 120 culverts per year should be being renewed. Historically replacement has been less than 1% with around 40 culverts being replaced each year. No significant deterioration of the culvert asset has been observed at this level of investment and pending collection of more validation data, it is proposed that this level of investment be maintained. There are a number of steel arnco culverts that are showing up as rusted out and need replacement. With 40 renewals per year at $5000/culvert = $200,000, the 2015/16 budget of $210,000 appears to be sufficient, for the culvert and stormwater renewals. 1.6.3.6 Cost / Financial / FWP A copy of the proposed financial Forward Works Programme (FWP) is included at the end of this Section. The split between subsidised and unsubsidised works is as defined in Chapter F7.3 (W/C 113) of the NZTA Planning, programming and funding manual. The various material types available in the drainage product market differ in cost and quality. Experience suggests that as drainage facility life spans are more often governed by damage due to exceptional weather events rather than material stability, selecting quality verses price on a site by site basis is sensible. Financing into the FWP needs to reflect a balance between funding the changes promoted by stakeholder expectation, and striking an average renewal programme to meet the asset lifecycle. The proposed maintenance budgets are based on maintenance contract NOC 01 lump sum rates for drainage maintenance. The proposed renewal budgets reflect an ability to replace approximately 40 complete culverts each year; this rate is addressing the stock of very old pipe types and also the repair and replacement of damaged culverts.. Funding for depreciation and damage to new works installed into a growing asset under the Major Drainage (Renewal) package also draws down on the routine maintenance funding. 30 September 2014 Page 61 of Section