2. Overview of our Water System
Santa Rosa’s population is 161,496
Provide water and sewer services
Over 52,000 service connections
Approximately 43,000 SFR, 3,000 MFR, 3,000 CII and
1,700 dedicated irrigation customers
In 2008, delivered 18,450 acre-feet of water
Currently most of our water supply from SCWA
Additional Groundwater Sources Available
3. Snapshot of Santa Rosa’s Demand
Current Demand
Average daily use: 17 mgd
Winter daily use: 13 mgd
Peak month average daily use: 32.5 mgd
4. Water Use Efficiency Program
Started in 1976-77 in response to the drought
Further established in the early 1990s
Signatory to CUWCC MOU in 1998
Saving 4,497AFY or over 4.0 mgd
Reduces GHG’s by 2,900 tons per year
5. Water Conservation Programs
Rebate and Incentive Programs
Residential & Commercial
Residential Check-ups
Indoor & Outdoor
Free water efficient shower heads, faucet
aerators, hose shutoff nozzles
Customer Information and Outreach
Public events, hotline, website
Home Audit Kits, Turf-time, Top Ten Tips
Large Landscape Irrigation Audits
Water use analysis
Irrigation Efficiency
Tiered Water Rates
6. Conservation Technologies
Green Exchange
Cash for grass
Irrigation Upgrades
Rainwater Harvesting
Gray Water
Turf Time information
Water Wise Gardening
7. Rainwater Rebate
$0.25 per gallon of storage
Rebate is limited to the estimated peak
month gallons of water use for the site
Rebate cannot exceed the cost of
materials, labor not included
Backflow required for all systems
Requirement depends on system
Plumbing permit needed
Requires annual testing
Pre & post inspection by Water Use
Efficiency section
Permits required by Building Dept
8. Rainwater – Additional Info
Electrical permit needed if pump installed
Other permits as required
Must insure vector control – consider length of storage
and include appropriate treatment if needed
Recommended that all vents and inlets have mesh
screens at minimum to prevent debris from entering
storage
Recommend maximizing irrigation efficiency in order
to more efficiently use stored rainwater
9. Peak Month Water Use
At pre-inspection, all landscape square footage is
measured as low (LW), moderate (MW) and high (HW)
water use.
Low water use assigned 30% of Eto, moderate 60% and
high 100%.
Budget is determined using peak month ET (July)
Formula is (( HW ( MW * .6) ( LW * .3)) * 6.6 * .623 ) / 1000
where 6.6” is 10-year avg ET for July and
.623 is conversion factor for gallons
Outcome is site water budget for peak month in 1000’s
of gallons, rounded up to nearest 1000.
10. Current Projects
Program authorized January of 2009. Advertised to customers
starting spring 2009.
Eighteen pre-inspections to date – 17 residential, 1 commercial.
Five residential projects currently completed.
Average storage installed: 4815 gallons
Min: 1000 gallons. Max: 11400 gallons. Total: 24076 gallons
Commercial project planned at local High School
Planned installed storage: 89000 gallons
Site budget is over 2.5 million gallons
Commercial (dedicated irrg meter) outreach next planned push
12. Case 1
5600 sq ft of total landscaping
15Kgal budget
Lawn reduction and irrigation improvements installed
in June 2009 (prior to rainwater system)
13. Installed System
Pump and
WISY filter pressure tank
3076 gal tank
18. Rebate Cost v. Savings
Current cost per acre foot of water: $ 604
Projected cost in 2011: $ 676
Cost to city of rebate: $ 678
Site water savings due to increase
in consumer awareness: Pri¢ele$$
19. Questions – Thank you
Randall S Barron, City of Santa Rosa, (707) 543-3994, rbarron@srcity.org
Editor's Notes
Intro, who we are, about our program, two typical installations
One AF is approx 326,000 gallons
CDPH's Title 17 of Code of Regulations says “Premises having auxiliary water supply’ must have cross-connection control (1) Auxiliary Water Supply is any water supply other than that received from a public water system. (2) Premises where there is an unapproved auxiliary water supply and there are not interconnections with the public water system, a double check may be provided in lieu of a reduce pressure device if approved by the Health agency and water supplier. (3) Backflow preventer shall be tested at least annually or more frequently if determined to be necessary by the water supplier.
Part physical water savings, part heightening of customer awareness
107kgal/summer savings. $622/yr System cost: $6550