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Note there is an error, below, where the increase in acre feet from increasing height of dams is not 5,000 but 20,000 !

Improve Storage

Electrify Lake Soulajule (near-term) 

• This measure provides PG&E line power to the pump station at Lake Soulajule so that the lake can be operated more frequently.  

• Estimated water yield: 420 AFY.  

• Estimated cost: $6 million 

• Cost per AF: $1,800. 

Phoenix-Bon Tempe Connection (near-term) 

• This project installs a connection from Phoenix Lake to Bon Tempe reservoir, increasing District control over water flows.  

• Estimated water yield: 260 AFY 

• Estimated cost: $5 million  

• Cost per AF: $1,611 

Forecasting and Stream Release Automation (near term) 

• This initiative aims to improve forecasting capabilities and stream release automation to better manage releases. 

Increase Storage

Raising Dams (long-term) 

• Develop an additional storage via movable spillway or raising of dams at Kent, Nicasio or Soulajule reservoirs.  

• Estimated yield: 20,000   5,000 error acre-feet 

• Estimated cost: $90 million 

Increase Storage via Regional Partnerships (long-term) 

• Pumping existing groundwater from the Santa Rosa Plain aquifer for consumption could create the necessary capacity to store winter water from Sonoma County.  

Sonoma Water

Operational Strategy for Maximizing Sonoma Water supply (near-term) 

• Develops operational rules to guide the timing and quantity of water purchased from Sonoma to maximize take of supplemental water in dry years while minimizing risk of reservoirs spills.  

Dedicated Conveyance (medium-term) 

• Develop dedicated conveyance to storage in two phases.  

• Phase 1 – Stafford Lake to Soulajule/Nicasio  

• Phase 2 – North Marin Aqueduct to Stafford Lake 

• Estimated water yield:  3,000-3,150 acre-feet 

• Estimated cost: $111-$158 million 

Improve Existing Conveyance (medium-term) 

• Improve conveyance of water to Marin Water system via South Transmission System and possible Kastania Pump Station expansion.  

Desalination and Recycle

Petaluma Brackish Desalination (near-term) 

• Monitor advances in desalination technology, track installation of desalination plants in California and perform feasibility analysis for Petaluma brackish desalination which could conceptually yield 5,000 acre-feet.  

Recycled Water Expansion (near-term) 

• Pursue grant opportunities for recycled water projects to reduce the cost to the average cost.  

SOURCE: https://www.marinwater.org/WaterSupplyResiliency

Water Storage per Lake 2009-2020

Reservoir Storage Acre-Feet

Notice how annual inflow can exceed capacity !! For the county its 97k vs 78k Acre-Feet per year.
 Kent has never gone below 20k in the last 10 years . Why are we not using more of Kent water?

And yet on APPENDIX D page 36 they discuss enlarging Kent Storage as an option ?

As Kent pumps water to other lakes ( see below) what is its OUTFLOW? (Kent Lake also releases approximately 6,000 AFY for downstream environmental requirements in Lagunitas Creek).

NOTE: Nicasio has gone down to 10k from its capacity of 20k.

The Kent dam heightening alternative will yield between 4,000 and 5,000 AFY of additional dry period water supply during four-year drought.
The cost is $65 to $90 million, $1,300 to $2,000 per AF. APPENDIX D page 34 is for both Kent and Nicasio Dam alternative for total increase of 20,000 AF

Storage SOURCE  https://www.marinwater.org/sites/default/files/2023-01/MMWD_SWSA_Draft_January_AppendixB_0.pdf