SS Credit 6.1: Stormwater Design: Quantity Control
1 Point
Intent
Limit disruption of natural water hydrology by reducing impervious
cover, increasing on-site infiltration, reducing
or eliminating pollution from stormwater runoff, and eliminating
contaminants.
Requirements
CASE 1 — EXISTING IMPERVIOUSNESS IS LESS THAN OR EQUAL TO 50%
Implement a stormwater management plan that prevents the
post-development peak discharge rate and quantity
from exceeding the pre-development peak discharge rate and quantity
for the one- and two-year 24-hour design
storms.
OR
Implement a stormwater management plan that protects receiving
stream channels from excessive erosion by
implementing a stream channel protection strategy and quantity
control strategies.
OR
CASE 2 — EXISTING IMPERVIOUSNESS IS GREATER THAN 50%
Implement a stormwater management plan that results in a 25%
decrease in the volume of stormwater runoff
from the two-year 24-hour design storm.
Potential Technologies & Strategies
Design the project site to maintain natural stormwater flows by
promoting infiltration. Specify vegetated roofs,
pervious paving, and other measures to minimize impervious surfaces.
Reuse stormwater volumes generated for
non-potable uses such as landscape irrigation, toilet and urinal
flushing and custodial uses.
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