Summary of BMP Savings Calculator Sample Results SB X7 7 Urban Stakeholder Committee 22 October 2010 Richard A. Mills California State Water Resources Control Board

Presentation Overview Summary of Calculations using Draft BMP Savings CalculatorSummary of Calculations using Draft BMP Savings Calculator  27 random sample runs

Components of Calculator CUWCC MOU BMPsCUWCC MOU BMPs  1.2 Water loss control  1.3 Metering  3.1 Residential assistance  3.2 Residential landscape  4 CII (including toilets/urinals)  5.2 Landscape budgets Residential toiletsResidential toilets Residential washers & showerheadsResidential washers & showerheads

27 Water Suppliers Tested 27 random examples27 random examples  20 CUWCC members

27 Water Suppliers Tested North Coast – 1North Coast – 1 San Francisco Bay – 2San Francisco Bay – 2 Central Coast – 2Central Coast – 2 South Coast – 17South Coast – 17 Sacramento River – 2Sacramento River – 2 San Joaquin River – 2San Joaquin River – 2 Tulare Lake – 1Tulare Lake – 1

Summary Results Supplier2005 Base- line GPCD GPCD Targets & % Reduction CalculatorMethod 1 Method 3 27 Random Examples Weighted average* % Reduction Unweighted average % Reduction % % % % % % Previous 28 Random/ Nonrandom Examples Weighted average* Unweighted average 12.5% 12.4% 20% 17.6% 24.2% * Weighted by population.

Additional GPCD Adjustment Required for 20% Reduction BMP Savings Adjustment Factor Weighted average 13.4%6.6% Unweighted average 13.4%6.6% Note: For 27 random samples.

10 Hydrologic Regions North Lahontan South Lahontan Colorado River South Coast Tulare Lake Central Coast San Francisco Bay North Coast Sacramento River San Joaquin River # of Examples

Population Distribution of 27 Random Samples Hydrologic Region 1 NC 2 SF 3 CC 4 SC 5 SR 6 SJR 7 TL 8 NL 9 SL 10 CR Total 27 Samples , ,602 % of HR 2%13%4%7%3%7%4%0% 7% Hydrologic Region Total 6746,4051,53519,4892,9021,9782, ,645 HR as % of Statewide 2%17%4%53%8%5%6%0%2% 100% 2005 Population in thousands