Storm Water Resource Plan

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Coastal Mendocino County Storm Water Resource Plan (SWRP)

Upcoming Meetings

The County invites you to join us at an upcoming stakeholder meeting provide input on stormwater projects in your community!  The next stakeholder meeting will be October 24, 2017, from 5pm - 7pm at the Fort Bragg Town Hall, 363 North Main Street. 

You can help in the SWRP process by submitting projects for evaluation in the SWRP and helping us prioritize potential projects!  Submit your project below by September 30, 2017.

 Submit a Project for Evaluation in the SWRP

Planning & Building

 

About the SWRP

The Coastal Mendocino County Storm Water Resource Plan (SWRP) encompasses three coastal watersheds in Mendocino County, Northern California: Pudding Creek-Frontal Pacific Ocean Watershed, Noyo River Watershed, and Big River Watershed. The purpose of the SWRP is to identify potential projects that utilize stormwater as a resource for multi-benefit projects that augment water supply, identify areas of concern, enhance water quality, reduce localized flooding, and create environmental and community benefits within the three coastal watersheds.

MendocinoCountyHW128Until recent years, the State Water Board and Regional Water Quality Control Board (Regional Water Board) National Pollutant Discharge Elimination System (NPDES) permitting program for municipal separate storm sewer systems (MS4s) has historically focused requirements for stormwater and dry weather runoff capture and use on new development and significant redevelopment, rather than on modifications to existing landscapes to increase stormwater and dry weather runoff capture and use.

In 2014, Prop 1 was passed by California voters. Prop 1 created a fund to allocate monetary resources to increase water supply reliability, restore and preserve fish and wildlife habitat, and develop resilient and sustainably managed water systems that will withstand future and unforeseen pressures in the coming decades. In 2015, the State Stormwater Resource Plan Guidelines were prepared to build a framework consistent with the requirements of California Water Code sections 10561-10573. The Coastal Mendocino County Stormwater Resource Plan (SWRP) utilizes the SWRP Guidelines to screen and evaluate projects based on weighted benefit criteria and quantitative analysis. The five main benefit categories are Environmental, Water Supply, Water Quality, Community, and Flood Management benefits. Quantitative methods utilized in project prioritization are project-dependent and a function of the benefit category that applies to the project. During the Technical Advisory Committee (TAC) Kickoff Meeting on July 13, 2017, the five benefit categories were ranked (Table 1).

Table 1. Benefit Category Ranking from July 13, 2017 TAC Meeting

Benefit Category
Weight

Environmental

3

Water Supply

3

Water Quality

3

Community

2

Flood Management

1

 

Each benefit category includes several primary and secondary benefits. A proposed project must be applicable to two primary benefits and one secondary benefit in order to qualify as a project alternative. Some primary or secondary benefits apply to more than one benefit category. For example, nonpoint-source pollution control fits into the Water Quality benefit category and the Environmental benefit category. Primary and secondary benefits are utilized in the selection of the appropriate quantitative methods for each benefit category.

Main Benefit

Weight

Benefits

Environmental

3

Primary

In-Stream Flow Improvement

Wetland Creation

Riparian Enhancement

Secondary

Trash Reduction

Improvement of Fish & Wildlife Habitat

Reestablishment of Natural Hydrographs

Creation of New Open Spaces/Wildlife Corridors

Reduced Energy Use/Greenhouse Gas Emission/Provide Carbon Sink

Water Supply

3

Primary

Groundwater Supply

Surface Water Supply

Secondary

Water Conservation

Conjunctive Use

Water Quality

3

Primary

Nonpoint Source Reduction

Decreased Turbidity

Decreased Sediment Loading

Secondary

Temperature Reduction

Herbicide Runoff Reduction

Community

2

Primary

Employment Opportunities

Recreational Area Development

Secondary

Public Education

Youth Education Programs

Flood Management

1

Primary

Reduce Stormwater Runoff Rate & Volume

Capture & Reuse Stormwater

Secondary

Reduced Sewer Outflow

Decreased Flood Risk