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 Green
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 Introduction
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 Runoff
Mitigation Plan
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Submit
a Runoff Mitigation Plan
The
City of Santa Monica’s Urban Runoff Pollution Control
Ordinance (SMMC
7.10.050) requires that all new developments and substantial
remodels (as defined by the Municipal Code) prepare an Urban
Runoff Mitigation Plan.
The
purpose of this plan is to insure that each new development
maximizes permeable surface area and minimizes the amount
of runoff that is directed to impermeable areas. The Urban
Runoff Mitigation Plan must be submitted to the City of
Santa Monica, Engineering Division when an application for
first planning approval is submitted. The Urban Runoff Mitigation
Plan must show that the projected runoff will be reduced
by at least 20%.
Following
the design elements and principles in this book will help
insure that the plan will meet the requirements outlined
in the Urban Runoff Pollution Control Ordinance.
One
or more of these elements must be implemented:
- Limit
the impervious area of the total surface area. Calculate
the imperviousness ratio as follows: Percentage of impervious
area = Total impervious area/Total project size. Impervious
areas include rooftops, impervious driveways, sidewalks,
etc. Permeable pavements are excluded from the impervious
calculation. If the percentage of permeable area is greater
than 20%, then no additional measures are required.
- Incorporate
structural Best Management Practices (BMPs) that are found
to be beneficial to the prevention of stormwater pollution,
i.e., oil/water separators, catch basin inserts, sand
filters, detention basins, ponds, vaults, trenches, dry
wells, roof downspout infiltration, porous pavement, grid
pavers, grass swales and strips, etc.
- Design
timing and application methods of irrigation systems to
minimize the runoff of excess water into the storm drain
system.
- Achieve
long-term soil stabilization by permanent growth of native
vegetation, including but not limited to native grass,
sod, tree planting, shrubs, vines and /or other ground
covering.
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