5.3.1 Asset Valuation ........................................................................................................................... 55 5.3.2 Depreciation Methodology .......................................................................................................... 55 5.3.3 Optimisation ................................................................................................................................ 57 5.4 Key Assumptions ...................................................................................................................... 57 Chapter 6: Plan Improvement and Monitoring ..................................................................... 60 6.1 Status of Asset Management Practices .................................................................................. 60 6.1.1 Asset Management Information System ..................................................................................... 60 6.1.2 Geographical Information System ............................................................................................... 61 6.1.3 Computer Modelling .................................................................................................................... 61 6.1.4 Financial Forecasting .................................................................................................................. 61 6.1.5 Customer Service Data ............................................................................................................... 61 6.1.6 Asset Data Confidence ............................................................................................................... 62 6.2 Improvement Programme......................................................................................................... 63 6.2.1 2012- 20 Improvement Programme ............................................................................................ 65 6.3 Monitoring and Review Procedures ........................................................................................ 69 6.4 Performance Measures ............................................................................................................. 69 Appendix 1 – Operations and Maintenance – Stormwater/Wastewater Risk Profile ......... 71 Appendix 2 – Stormwater Operational Budget Projection 2015-25 ................................... 102 Appendix 3 – Non-Financial Performance Measures ......................................................... 103 Appendix 4 – Blenheim Stormwater Strategy – Action Plan ............................................. 104 Appendix 5: Stormwater Asset Valuation ........................................................................... 127 Appendix 6: Capital Budget 2015-18 ................................................................................... 128