To control post-construction stormwater impacts from
regulated earth disturbance activities, state water quality requirements
can be met by BMPs, including site design, which provide for replication
of preconstruction stormwater infiltration and runoff conditions so
that post-construction stormwater discharges do not degrade the physical,
chemical or biological characteristics of the receiving waters. This
may be achieved by the following:
(1) Infiltration: replication of preconstruction stormwater
infiltration conditions;
(2) Treatment: use of water quality treatment BMPs to
ensure filtering out of the chemical and physical pollutants from
the stormwater runoff; and
(3) Stream bank and streambed protection: management of
volume and rate of post-construction stormwater discharges to prevent
physical degradation of receiving waters (e.g., from scouring).