Cost and Benefit Options Analysis
Clients: Multiple, 2000 - ongoing
Responsibilities: Specialist advice into CAPEX and OPEX costs and benefits of water sensitive design options.
Achievements: Projects include:
Auckland Unitary Plan Stormwater Management Provisions: Cost and Benefit Assessment - Primary author of Auckland Council Technical Report 2013/043. Preparation of detailed report and appendices on construction, on-going maintenance and total present costs of typical stormwater management devices that can be used to meet the Unitary Plan requirements for on-site stormwater quality and flow management. Compared absolute cost of implementing on-site devices meeting the Unitray Plan requirements versus the current Air Land and Water Plan statutory provisions. Assessed costs and benefits for a range of development scenarios. Collated and presented local and international case studies that assess the benefits of a water sensitive design approach for greenfield and brownfield developments.
Long Bay Water Services Comparison of Costs - Preparation of rough order costs for stormwater, water supply and waste water services for the wide range of four different development scenarios varying from the fully reticulated conventional option (Scenario 1) to the fully self-sufficient alternative option (Scenrio 4). The rough order Council, developer and private landowner costs were estimated for large lot (2,500 to 5,000m2 lots) and urban village/neighbourhood (150 to 600m2 lots). Each of the four different development scenarios were ranked using a multi-criteria weighting system, cost being one of the criteria.
Water Sensitive Design Retrofit - Cost and benefits of retrofit stormwater quality management options including raingardens, rainwater tanks and repainting of house roofs. Project was part of the Auckland Regional Council Low Impact Design (Water Sensitive Design) Grant initiative. Located in the West Harbour neighbourhood, over 44 hectares of existing “brownfield” residential area.
Albany Centre, Proposed Plan Change 9 and Variation 67 - Costs and benefits to stream health for a wide range of stormwater treatment scenarios and practicalities of installation.
Sarsfield Catchment, Investigation of Alternative Options - Costs and benefits (using a multi-criteria sustainability matrix) of different structural and at-source technology solutions for managing the combined sewer overflows from the Sarsfield Sub-catchment.
Glencourt Place/Seaview Road stormwater management alternative - Costs of using rainwater tanks on 25 properties to reduce stormwater flows and negate the need to replace the undersized downstream section of stormwater pipe. Detailed costings and modelling of number of tanks versus stormwater flows. Project carried through with the installation of 22 dual purpose (rainwater retention for non-potable household water use and detention to reduce peak flows) rainwater tanks.
Cost Benefit Analysis of New Technologies Stormwater and Wastewater - Preliminary cost benefit analysis of stormwater ponds, bioretention, rainwater tanks, permeable paving, soakaway trenches and conventional reticulation for conceptual development layouts.
Auckland Unitary Plan Single House Rain Garden Option
Long Bay Scenario 4 Neighbourhood Lots
Glencourt Place Rainwater Tank