Culver City Parks Task 8.1 Final Plan - Flipbook - Page 130
Figure 120. The channelized Ballona Creek runs throughout Culver City. Source: OLIN, 2024.
Per the MS4 Permit, redeveloping city parks
may require the implementation of Low Impact
Development (LID) Best Management Practices
(BMPs)33 if the redevelopment creates or replaces
5,000 square feet or more of impervious surface.
These redevelopment projects or “Priority
Development Projects” must implement structural
BMPs to retain the Storm Water Quality Design
Volume (SWQDV), which is defined as either the
runoff from the 0.75-inch, 24-hour rain event
or the runoff from the 85th percentile, 24-hour
rain event, whichever is greater. Proposed BMPs
must assess, in order of preference, the feasibility
of on-site infiltration, bioretention and/or rainfall
harvest and use; on-site biofiltration, off-site
groundwater replenishment and/or off-site retrofit;
or on-site treatment. The selection of BMPs during
redevelopment offers additional benefits beyond
water quality improvements, such as opportunities
to enhance resiliency through water supply benefits
and reductions in water use.
130 THE PLAN // SYSTEM SCALE
When considering the MS4 Permit and the redesign
of existing parks, incorporating site design measures
to disperse impervious areas, such as concrete
walkways, to pervious areas including decomposed
granite or vegetated areas, may be a cost effective
way to reduce the need for more structural and
costly stormwater capture BMPs. Other cost effective
options include bioretention systems, rain gardens,
above-ground cisterns and vegetated swales. Culver
City Public Works developed the SWQMP in 2021
which identified certain park facilities for larger,
regional stormwater capture BMPs. There are
opportunities to coordinate with Public Works on
the implementation of these regional stormwater
capture BMPs during redesign phases of the parks.
Options for implementing regional stormwater
capture BMPs, or on-site stormwater management
BMPs, are further explored in this chapter and in
Chapter 6.
