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Water Supply and Drought Resilience

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Presentation on theme: "Water Supply and Drought Resilience"— Presentation transcript:

1 Water Supply and Drought Resilience
Central Coast Sustainability Summit Thomas D. Fayram, PE Santa Barbara County Public Works

2 Sustainability Review
Current Water Supply Situation Exhausted Cachuma Reservoir No Allocation in 2016 No Allocation for 2017 Carryover Water in Reservoir almost gone.

3 Water Supply Inputs (South Coast)
Local Surface Water (Cachuma, Gibraltar, Jamison) Imported Water (State Water Project) Groundwater Recycled Water (Goleta, City SB) Desal (coming soon)

4 Conjunctive Use & Supply Strengths
Availability of Imported and Local Supplies Vary Sustainability – Identify supplies as supplemental or primary Supplemental – “use it when you can get it” Primary – “be sure its there when you need it” Experiences from the Drought State Water Project – Offset Groundwater Pumping (North County), Supplement Surface Water (South Coast)

5 County Regional Plumbing / Water Transmission Facilities

6 Cachuma Project

7 Cachuma Project Constructed 1950’s (1959 first spill)
Current Capacity, 193,300 Acre-Feet Current Storage, ~14,000 AF Intended as a 7 Year Supply ( historical modeled Critical Drought Period)

8 Cachuma Reservoir Cachuma is a multi-benefit resource
Key benefits Include; Important Water Supply Feature for South Coast; SY Valley / Downstream Multiple Other Important Benefits Recreation Modified Storm Operations (Flood Control) Sustains A Unique Micro-Environment Economic SWP Delivery Conduit

9 Cachuma Historical Storage

10 Cachuma Historical Storage

11 Historical Rainfall SY River Watershed
(7 yr Critical Drought)

12 Current Drought 5 Year Period most Severe on Record
Yet to Define 7 Year Period Coincides with increased loss of supplies (Cachuma, SWP)

13 Steps to Sustainable Water Supply
Cachuma on 7 year Safe Yield Cachuma is our key to supply and capacity reductions in supply continue Access Imported Sources when Available (capacity designed for supplemental source) Develop Desal / Recycled Sources Continued Conservation Develop New options (Desal for SWP?) Maximize other; grey water, storm water Capture

14 Summary Cachuma Is a multi-benefit Resource
Single Purpose Projects no longer feasible Cachuma' s Paramount Purpose is as a Reliable Water Supply All Other Benefits are Compatible with making Cachuma a Reliable Water Supply Better Management of the Lake Benefits Everyone

15 Questions “And it never failed that during the dry years the people forgot about the rich years, and during the wet years they lost all memory of the dry years. It was always that way.” John Steinbeck


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