Water Resources Plan 2040 Update Draft Conclusions and Recommendations November 22, 2016

Analysis Demonstrates that MMWD’s Proactive Actions Have Significantly Improved Water Supply Resiliency 1979: Built Soulajule Reservoir Increase storage by 10,000 AF 1981: Recycled water program Saves 600 AFY of potable water 1982: Expanded Kent Dam Raised 45-feet Doubled storage capacity to 32,900 AF 1993: Aggressive conservation program & conservation-oriented rate structure Increased supply imported from Sonoma County (provides 25% of water supply)

Increased Storage Implemented Over Time  Improved Resiliency Expanded Kent Lake Soulajule Reservoir Nicasio Reservoir Kent Lake Expanded Alpine Lake Bon Tempe Reservoir

Efficient Water Use has reduced Demand and Improved Resiliency Production is for fiscal year ending, and does not include recycled water or untreated water.

Process for Conducting Resiliency Analysis Identify Events, Futures, and Options Evaluate and Refine Preliminary Options Identify Gaps / Needs (Shortfalls Under Event / Future Conditions) Develop / Evaluate / Refine Alternatives to Address Gaps / Needs

Events and Futures Drought Climate Change Wildfire Earthquakes Greatest Stressor Historical recorded droughts and 6-year drought Drought Four climate change hydrology sets developed by USGS Climate Change Impacts to water quality at Kent, Bon Tempe, Alpine Lakes Wildfire Outages to Bon Tempe WTP, San Geronimo WTP, and imported supply Earthquakes Impacts to Kent and Alpine Lakes, Nicasio Lake, imported supply Water Quality Outages at Bon Tempe WTP, San Geronimo WTP, Alpine Lake Landslides

Resiliency Options Water Use Efficiency Reuse Expand SCWA Conveyance Expand Storage Water Purchases and Groundwater Desalination Emerging Options

Key Information For Each Option Description Facilities Required Sizing and Cost Yield and Reliability (Average and Dry Year) Implementation Considerations Conceptual Map / Schematic

Preliminary Evaluation Criteria Cost Institutional Complexity Local Control Environmental Stewardship Technical Complexity Reliability Public Support

Options Evaluation Developed 40 resiliency options Used decision score and options costs to evaluate the 40 resiliency options in a tradeoff curve Decision Score (benefits) vs. Cost Options with lower cost/higher benefits were selected for alternatives development High scoring options were selected for alternatives development and grouped into the following resiliency categories: Expand existing programs Minimize infrastructure Dry Year actions Maximize reuse Maximize resiliency

Resiliency Analysis Use storage reserves

Resiliency Alternatives: Group A Meets demands during 6-year drought No demand reduction Maintains storage reserves Alternative Options Dry Year Yield (AF) Dry Year Actions Enhanced Conservation Spot Market Transfers 6,000 Maximize Reuse Regional IPR 7,900 Maximize Resiliency Kastania Pump Station Upgrade Santa Rosa Plain Conjunctive Use Watershed Management 11,000

Resiliency Alternatives: Group B Meets 4 year drought demands Encroaches storage reserves in years 5 & 6 of 6-year drought To maintain storage reserves, requires demand reductions Alternative Options Dry Year Yield (AF) Expand Existing Programs Enhanced Conservation Santa Rosa Plain Conjunctive Use Watershed Management up to 1,200 Minimize Infrastructure Kastania Pump Station Upgrade 3,900

Draft Conclusions and Recommendations

Conclusions & Recommendations MMWD’s resiliency actions provide significant benefits These resiliency actions will enable the district to survive a number of futures Alternatives exist to address resiliency needs under the most extreme conditions Adaptive Resiliency: Continue water efficiency programs at current level; increase if necessary Investigate low- or no- infrastructure alternatives (groundwater exchange) Track hydrologic conditions and demand patterns

Next Steps

WRP 2040: Public Outreach Nov 22, 2016 DOC Dec 7, 2016 DRTF Draft Conclusions and Recommendations Nov 22, 2016 DOC Public Workshop Dec 7, 2016 DRTF Admin Draft Report Jan 20, 2017 DOC Public Review Period Feb 2017 Board Review of public comments Mar 2017 DRTF Final WRP 2040 Apr 2017 DOC

Water Resources Plan 2040 Update Draft Conclusions and Recommendations November 22, 2016