Step 1. Baseline Water Use and Midpoint Year Whispering Glen Water District selected a 10-year baseline period of 1996-2005. The average base daily per capita water use for this period was calculated to be 228 GPCD. The savings are calculated based on water deliveries in the midpoint year of the baseline period, which is 2000. Step 2. Metering Savings (Equation 4) Deliveries to Unmetered Connections in X 0.20 Midpoint Baseline Year, gallons 2,541,637,800 Metering = = 8.3 GPCD Savings, GPCD Service Area Population in Midpoint X 365 days Baseline Year 168,118 Step 3. Indoor Residential Savings Alternative 1, Target Method 4 Calculator: Residential Residential Total Washers Showers Indoor Toilets Toilets 16.5 Savings, Savings, = + + + = Residential Savings, Savings, GPCD GPCD GPCD Savings, GPCD GPCD GPCD 7.6 1.6 6.0 1.3 Alternative 2, Default: Total Indoor Residential = 15.0 GPCD Savings, GPCD Step 4. CII Savings (Equation 5) Average baseline CII CII Savings, Water Use, GPCD = X = 0.10 6.9 GPCD GPCD 69.0
Step 1. Baseline Water Use and Midpoint Year Whispering Glen Water District selected a 10-year baseline period of 1996-2005. The average base daily per capita water use for this period was calculated to be 228 GPCD. The savings are calculated based on water deliveries in the midpoint year of the baseline period, which is 2000. Step 2. Metering Savings (Equation 4) Deliveries to Unmetered Connections in Midpoint Baseline Year, gallons X 0.20 Metering Savings, GPCD 2,541,637,800 8.3 GPCD = = Service Area Population in Midpoint Baseline Year X 365 days 168,118 Step 3. Indoor Residential Savings Total Indoor Residential Savings, GPCD = Toilets Savings, GPCD + Toilets Savings, GPCD + Residential Washers Savings, GPCD + Residential Showers Savings, GPCD = 16.5 GPCD 7.6 1.6 6.0 1.3 Alternative 1, Target Method 4 Calculator: Alternative 2, Default: Total Indoor Residential Savings, GPCD = 15.0 GPCD Step 4. CII Savings (Equation 5) CII Savings, GPCD = Average baseline CII Water Use, GPCD X 0.10 = 6.9 GPCD 69.0
Methodologies-February%202016%20FINAL%20Draft.docx