Comprehensive Water Conservation and Supply Plan

Transcription

1 Comprehensive Water Conservation and Supply Plan 2015 Update October 6, 2015

2 Purpose Inform Council of gap between current supply and maximum future demand Recommend continued pursuit of least-cost actions to close gap Not asking for any significant changes to funding Not asking for endorsement of specific programs

3 Whistler s Water System

4 Water System Principles 1. Provide safe drinking water in accordance with the Canadian Drinking Water Standards and in compliance with Provincial Regulation 2. Provide sufficient water to meet all instantaneous domestic and fire flow demands at all times 3. Use 21 Mile Creek as much as possible to minimize costs and provide highest available drinking water aesthetic quality 4. Accommodate periods when 21 Mile Creek supply is off-line, using groundwater to satisfy all demands 5. Work towards integrating and simplifying the supply system in order to increase system resilience and minimize longterm costs 6. Use both conservation programs and supply projects to satisfy future demand growth in the most cost-effective manner

5 Annual Water Supply

6 The Supply Gap Overall water supply can meet expected overall maximum demand Expected demand in Whistler core area can exceed supply under certain conditions Current Max Day Demand (m3/min) Build-Out Demand (m3/min) Current Supply (m3/min) Supply Gap at Build-Out (m3/min) Where? Alpine Cheakamus Core Area (5.4) Emerald All Whistler Sub-Total

7 Closing the Gap - Options Two approaches to closing the gap between supply and demand: Water conservation New water supply infrastructure Cost estimates and effect on water supply have been developed to allow evaluation of both approaches on an comparable basis Council has previously endorsed this methodology

8 Water Conservation Goals Whistler Community goal of reducing water consumption to 425 litres/capita/day 2014 community-wide consumption 509 litres/capita/day To achieve the goal, 17% decrease required 3% per year

9 Previous Water Conservation Programs Implemented 1999 through 2009: Golf course irrigation wells Hydrant use permits Sprinkling bylaw Low flow fixture bylaw Parks irrigation wells Leak detection and repair

10 Potential Water Conservation Programs Higher Value Once through water use by-law Updated water use by-law Water use by-law outreach Water leak reduction Public education Lower Value Irrigation source at Meadow Park fields Residential water audits & retrofits Metering and volume based pricing Non-residential water use audits Low-volume toilet rebates Efficient clothes washer rebates Efficient landscaping or rebates Rainwater capture rebates Efficient irrigation rebates

11 Potential Water Supply Projects Highest Value Spring Creek Booster Station Lower Value New Function Junction Well Third 21 Mile Aquifer Well Aquifer Storage and Retrieval System Whistler Cay Well with extensive treatment Surface Water extensive treatment

12 Combined Conservation and Infrastructure Improvements Estimated Max Flow Benefit Max Flow- Weighted Benefit Priority Program Name Capital Cost Estimate Total Annual Cost/Savings Estimate (m3/min) ($/m3/min) C1 Once-Through Water Use By-law $0 ($27,000) 0.28 ($6,000) C2 Update Comprehensive Water Usage bylaw $0 ($5,000) 0.06 ($6,000) C3 Water Use bylaw - Outreach $0 $17, $1,000 C4 Water Leakage Reduction Program $380,000 $12, $1,000 C5 Public Education $0 $11, $8,000 S6 Spring Creek Booster Station $480,000 $35, $1,000 S7 New Function Well $320,000 $11, $1,000 S8 Third 21-Mile Aquifer Well (Rainbow Park) $560,000 $14, $1,000 C9 Irrigation source program $320,000 $9, $3,000 C10 Home water audits and retrofits $0 $10, $3,000 S11 Aquifer Storage and Retrieval (ASR) Pilot System $700,000 $70, $5,000 C12 Universal Metering & Volume-Based Pricing $10,710,000 $407, $12,000 C13 ICI audits $0 ($16,000) 0.61 ($2,000) C14 Low-volume Toilet Rebate $0 $14, $21,000 C15 Clothes washer rebate $0 $33, $41,000 C16 Efficient Landscaping Program TBD S17 Whistler Cay Aquifer Well w/ Treatment $10M - $20M Poor S18 Surface Water Treatment $15M - $30M Poor

13 Recommended Supply and Conservation Programs Estimated Max Flow Benefit Max Flow- Weighted Benefit Priority Program Name Capital Cost Estimate Total Annual Cost/Savings Estimate (m3/min) ($/m3/min) C1 Once-Through Water Use By-law $0 ($27,000) 0.28 ($6,000) C2 Update Comprehensive Water Usage bylaw $0 ($5,000) 0.06 ($6,000) C3 Water Use bylaw - Outreach $0 $17, $1,000 C4 Water Leakage Reduction Program $380,000 $12, $1,000 C5 Public Education $0 $11, $8,000 S1 Spring Creek Booster Station $480,000 $35, $1,000 RECOMMENDED PROGRAM TOTAL $860,000 $43, $374

14 Recommendations Continue with the six recommended programs identified in the preceding table, which will close supply gap with a small margin of safety, by providing an overall flow benefit of 6.9 m3/min. Commission and present to Council in 2016 a Comprehensive Volumetric Metering Options Review Include in the five year plan an investigation as to costs and benefits of an Efficient Irrigation / Landscaping Program

15 Expected Outcome Minimal change to capital and operating plans Significant progress towards Whistler s water conservation goals Assurance of sufficient, high quality water for the foreseeable future