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State Framework and Residential Water Use Targets

Learn about the state's water management planning, targets for residential and CII sectors, and the complexities of outdoor water use. Discover the framework, calculations, and measurements outlined in the legislation for efficient water use.

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State Framework and Residential Water Use Targets

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  1. State Framework and Residential Water Use Targets

  2. New Water Efficiency Bills • Water Management Planning • AB 1668. Friedman • SB 606. Hertzberg • Dual pieces of legislation sets efficiency targets for: • CII • Residential • Indoor • Outdoor

  3. Single Family Residential Targets • Indoor Targets = 55 gpcd down to 50 gpcd by 2030 • Outdoor Targets = Some percentage* of Net ET X Landscaped area *The percentage of Net ET is complicated and will most-likely be the subject of debate in the rule-making process.

  4. Indoor Water Budget • SFR Population X 55 GPCD X 365 days per year • Santa Rosa has an estimated SFR Pop. 115,515 • Santa Rosa’s Indoor SFR Budget = 115,515 X 55 X 365 = 2.32 bg

  5. Landscape Area Input • Landscape area x Outdoor standard x Net ET= Outdoor budget • DWR to measure Landscape area for all 410 urban retail water suppliers in California • DWR completed a 2 agency pilot- Padre Dam and the City of Santa Rosa • Measured landscape area for Single Family Residential

  6. Urban Landscape Area Measurements Classify landscapes into distinct categories (Pools, turf, trees and shrubs, hardscape, etc.,) Combine that data into broader categories (Irrigable-Irrigated, Irrigable-Un-irrgated, Un-irrigable, hardscape)

  7. Results • DWR completed accuracy assessment • Good results for Santa Rosa-but still have issues with Padre Dam. • For large parcels, mapping land as undeveloped vs. irrigable-not irrigated can be subjective

  8. Service Area: Single Family Irrigable Area Padre Dam Water District: Total SF Parcel Area: 536,933, 951 sq. ft. Irrigable Area: 134,233,488 City of Santa Rosa: Total SF Parcel Area: 327,418,317 sq. ft. Irrigable Area: 144,064,059

  9. Draft City of Santa Rosa Data for 2016 • Total SFR Water Use = 2,671,000,000 (2.671 bg) • Indoor Water Use = Population X 55 gpcd X 365 = 2.32 bg • Outdoor Water Use = Total – Indoor = 2.67-2.32 = 0.352 bg • Irrigable Area = 144 Million feet2 • Applied Water Depth = Water Volume Applied/ Area = 3.8” • Net Et = 34.5” • Water Applied = 11 % of Net Et • No WELO standard below 11% Net Et • The City would have met the target for SFR

  10. Questions

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