Former Sunnyside Nursery Multi-Benefit Project
About the Project
The Ross Valley Flood Protection & Watershed Program has been working to find and implement solutions to address the type of flooding which occurred most recently during the winter of 2005-2006, but which has repeatedly impacted the valley for decades (watch video). Recent studies (read reports) characterizing the flooding problem have demonstrated that a holistic approach is required to diminish or eliminate the effects of the most severe floods. The studies emphasize the need for a multifaceted way of addressing flooding which would both reduce the amount of floodwater reaching the creek, as well as increase the capacity of our creeks and floodplain to carry floodwaters to the bay.
In an effort to reduce the amount of floodwaters which would reach the creek, sites have been identified (read report) for temporarily storing floodwaters during rare and infrequent events which could otherwise flood downstream towns and neighborhoods. These detention sites would work together along with other improvements to help reduce flooding. One potential site which has been identified is the growing grounds for the former Sunnyside Nursery.
Status & Next Steps
At its meeting on July 12, 2016, the Board of Supervisors entered into an agreement with the owners of the former Sunnyside Nursery at 3000 Sir Francis Drake Blvd. to purchase the property. This summer, the District will be talking with neighbors and assessing the general feasibility of using the site for detention basin prior to completing the purchase.
|Task or milestone||Date(s)*|
|Purchase Agreement effective||7/12/16|
|Town of san anselmo council update||7/26/16|
|GEI does soil drilling & sampling||8/3-8/5/16**|
|GEI does soil testing||8/11-8/31/16**|
|Last day for County to request $38,000 deposit||8/26/16|
|gei Field investigation report||2/24/17|
*Dates are prelimary and subject to change.
**Per section 3.b. of the Purchase and Sale Agreement, this information is confidential until the County receives title to the property. The reports will be posted to this site once the County receives title to the property.
Any project at the former Sunnyside Nursery would aim to provide multibenefits in addition to those related to the flood risk reduction goal; these include creek, habitat, and possible recreational enhancements. A community-based participatory planning and design process would be used to engage residents and stakeholders, seek their input, and provide a pathway for them to help shape the project prior to its implementation.
Presentation to the Baywood Canyon Homeowner's Association
August 8, 2016
A neighborhood meeting was held on Tuesday 8/16/16 at 6:30 p.m. at the Baywood HOA club house to review a preliminary concept plan for the Sunnyside site and to answer questions about the conceptual basin design and how it would be expected to operate during a flood event. View the presentation slides.
Presentation to the Trestle Glen HOA
A neighborhood meeting was held on Thursday 8/25/16 at 7:00 p.m. at the Baywood HOA club house to review a preliminary concept plan for the Sunnyside site and to answer questions about the conceptual basin design and how it would be expected to operate during a flood event. View the presentation slides.
- Capital Improvement Plan Study Presentation (webpage)
- Capital Improvement Plan Study Report (webpage)
- Strategic Implementation Plan (pdf)
- Ross Valley Flow Reduction Study Report (pdf)
- Technical Memorandum No. 2.: Detention Basin Analysis (pdf)
- Analysis of Project Alternatives for DWR Grant (pdf)
- Examples of detention sites in other communities (view slides).
- Former Nursery Detention Basin Project Field Investigation Report (pdf)
- Former Nursery Detention Basin Project Geotechnical Report (pdf)
Purchase Agreement Information
Courtesy letters provided to neighbors of the former Sunnyside Nursery property:
Implementing Agency & Partners
Marin County Flood Control & Water Conservation District is the implementing agency.
The staff contact for the Marin County Flood Control & Water Conservation District is Liz Lewis, Planning Manager (LizLewis@marincounty.org 415-473-7226).