Mains water - Council 193 67 126 65% water - Residential 5,691 4,185 1506 26.5% Mains water - 579 174 405 70% Total 6,463 4,426 2037 32% Rain - Council unknown 9.9 n/a n/a Rain water - Residential 542 >542 n/a n/a Rain - n/a n/a n/a n/a Total n/a >552 n/a n/a Licensed extractions - Council n/a 90 n/a n/a Licensed extractions - Residential n/a n/a n/a n/a Licensed extractions - n/a 1,369 n/a n/a Total n/a 1,459 n/a n/a - Council* n/a 25.4 n/a n/a Other - Residential n/a n/a n/a n/a - n/a n/a n/a n/a Total n/a 25.4 n/a n/a * Water sourced from a private dam for road grading purposes (100kL per day between November and March and 40kL per day between April and October) Roof rainwater harvesting – private rainwater tanks or a comprehensive public system Rainwater captured in tanks is common across many properties in Nillumbik. In 2008 mains water was connected to 17,828 properties out of 19,250 private dwellings
Continue to assess the efficiency of water use in Council buildings and to retrofit with high standard fittings, fixtures and appliances and/or new water savings technologies as they become available. Council On-going Continue to liaise with Yarra Valley Water regarding installation of sewer in areas identified in the Domestic Wastewater management Plan as being high risk for contamination. Council On-going Advocate to the Government to accelerate funding to clear the sewerage backlog program Council 21 Recommendations for community actions Actions to support the community in sustainable management Responsibility Timeframe Support residents with relevant factsheets and information to participate in: Installing rainwater tanks and connecting tanks to toilets and laundry cold water taps. Practical workshops on implementing WSUD on private properties. Melbourne programs like their 10,000 Raingardens. Yarra Valley Water’s water conservation programs like showerhead exchange, toilet exchange. Activities by community groups to undertake planting and community education. Developing their own community groups to support sustainable water management and help link interested residents. Council On-going Apply for grants from the Stream Frontage Management Scheme run by Melbourne Water to support streamside enhancement works to address bank stabilisation issues, reduce sediment laden runoff entering waterways and prevent stock access with fencing. Landholders On-going Continue to develop demonstration projects for the community (for example, raingarden display at Edendale). Install meaningful signage to raise awareness of Council’s commitment to WSUD/IWM and encourage local community members to better understand and care for WSUD features. Council Use Council’s website to provide to Melbourne Water’s factsheets on WSUD on private properties (tanks, raingardens etc.) and links to other tools to assist residents, businesses and developers in implementing WSUD. Provide information forums, events and news. Council On-going Engage in discussions with Yarra Valley Water about septic tank management to devise options capable of reducing pollutant loads to streams and to draw on experiences elsewhere (eg. Park Orchards, Ringwood South) to devise appropriate responses. Council Immediate (2013-2014) Promote the responsible reuse of greywater and review and update educational material that ensures use as per EPA regulations. Council 2014 Provide an education strategy for households serviced by a septic system to effectively manage and maintain a healthy septic system, including reducing water consumption. Council 2014
'Rule of treatment areas for various catchment types WSUD Treatment Catchment Size of treatment measure Flow reduction and/or water conservation benefit (kL/yr) Pollutant reduction (kg/yr) TSS Pollutant reduction (kg/yr)TP Pollutant reduction (kg/yr)TN Cost/kg TSS Cost/kg (annualised) TN Rainwater tank^ 1 x 250 m2 roof (tank plumbed to toilet and garden irrigation) 2 KL per household 32 1 0.01 0.08 $70 $1,000 Wetland and harvesting scheme+ 10 ha urban (70% impervious) 3000 m2 -300 m3 6500 2900 3.8 23 $6 $700 Raingarden* 100 m2 road or car park (100% impervious) 1 m2 0 10 0.01 0.04 $6 $1,700 Raingardens (or tree pits)* 1 km road (7m wide, 100% impervious) 80 m2 0 700 0.9 2.5 $7 ($16) $2,000 ($4,500) Infiltration raingardens (or tree pits)# 1 km road (7m wide, 100% impervious) 50 m2 360 690 0.9 2.6 $5 ($10) $1,200 ($2,700)
Stormwater – storage & reticulation $1,000/kL $450 for tank with UV disinfection and quality testing $10/m2 for the vegetated areas $200/m2 for the sediment pond cycle benefits (drinking water conservation and minimising stormwater discharge to the environment thereby reduce pollutant loads to receiving waters) resilience to climate change cost savings as the supply of mains water cost increases (associated cost of supply from desalination ) Storage requirements may be large to account for seasonal differences between supply and demand to ensure adequate reliability of supply Land uptake for treatment and storage requirements in confined spaces Wetland $100/m2 ($66/m2 to $116/m2) $10/m2 for the vegetated areas $200/m2 for the sediment pond are scalable and can be used or at source landscaping and aesthetic value sites of refuge with significant habitat values if located adjacent to waterways Land uptake is larger to attain equal treatment performance compared to other treatment measures
MUSIC’s typically poor representation of recession decay curves and base flows as well as difficulties measuring very low observed flows. Calibrated soil parameters for Diamond Creek Parameter MUSIC Default Melbourne Water Calibrated Rainfall threshold (mm/day) 1 1 1 Soil storage capacity (mm) 120 30 110 Initial storage (% of capacity) 25 25 25 Field capacity (mm) 80 20 80 Infiltration capacity coefficient – a 200 200 200 Infiltration capacity exponent – b 1 1 1 Initial groundwater depth (%) 10 10 10 recharge rate (%) 25 25 2 Daily base flow rate (%) 5 5 2 Daily deep seepage rate (%) 0 0 0