Infrastructure Strategy Option Implications Option Implications detention. operational & maintenance costs of treatment Significant planning, modelling and engineering design apparatus. require in advance of development. Costs of sampling, laboratory analysis and data interpretation of stormwater outfalls. 2.2 Stormwater quality Option Implications 2.3 Ageing infrastructure REQUIRED Council will continue to identify best practice from Option Implications Meet the requirements of around NZ and implement these practices to ensure Renew non-critical mains Benefits the National Policy new developments are ‘future-proofed’ to meet current when failure rates become Ensures that only pipes that have reached the end of Statement for Freshwater and anticipated standards. intolerable. their useful life are replaced. Management. This work will include monitoring current discharge Costs quality and catchment risks and preparing plans for preventative and remedial works. Pipe failure will become apparent during storm events Status quo. Pro-actively Benefits and during likely increases of property flooding. manage potential pollution No additional costs Operation and maintenance costs will increase. sources within catchments and respond to pollution Costs Unpredictable renewals make budget and resource incidents as they occur planning difficult. Derogation of responsibilities under the NPSFW. Unplanned work is more disruptive and expensive than Fails to address long term low-level contamination from a planned programme of renewals. urban run-off. PREFERRED OPTION Benefits Unable to adequately monitor stormwater impact on the Implement a proactive, Targeted investment in planned renewals works. receiving waters planned pipe renewals PREFERED OPTION Benefits programme and invest more Smoothes the renewals investment profile Implement a comprehensive Provides good information on the catchment and in both condition Avoids unacceptable deterioration of the level of Stormwater Management infrastructure integrity and allows planned remedial assessment technology, service, Area Plan including field data collection and works. data management. Costs comprehensive stormwater Proactively protects the receiving water from chronic monitoring regime. Additional costs of pipe surveying, analysis and data contamination. collection to improve pipe and asset condition Install water quality Fits with the aims of the Blenheim Stormwater Strategy. assessments, to ensure well targeted renewals and treatment on new efficient investment. developments and retro-fit Costs treatment to existing Smoothing the renewals profile may accelerate the stormwater reticulation Additional costs to new developments investment programme if works cannot be deferred. Capital investment in retro-fit treatment. Additional 2018-2028 Long Term Plan Page 204