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Ch. 121
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Martin O'Malley, Governor
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2 year storm event compared to the site's predevelopment runoff
volume; and
(vii) Require a demonstration through hydrologic
and hydraulic analyses that:
1. For stormwater leaving the site,
postconstruction runoff hydrographs for the 2 , 10 , and 100 year
storm events do not exceed, at any point in time; the
preconstruction runoff hydrographs for the same storm events; or
2. There is no increase, as compared to the
preconstruction condition, in the peak runoff rates of stormwater
leaving the site for the 2 , 10 , and 100 year storm events and that
the increased volume or change in timing of stormwater runoff
will not increase flood damage at or downstream of the site;
(VII) Capture and treat stormwater runoff to
remove pollutants and enhance water quality;
(viii) Implement a channel protection strategy to
reduce downstream erosion in receiving streams; and
(ix) Implement quantity control strategies to
prevent increases in the frequency and magnitude of out-of-bank
flooding from large. less frequent storm events:
(9) (I) Specify that;
1. Environmental site design techniques are
the primary method for managing stormwater;
2. Standard best management practices may
be used only as a back up to catch runoff not dealt with through
environmental site design techniques; and
3. a developer has the burden of proof to
show that the use of environmental site design techniques is not
practical; and
(1) (i) establish a comprehensive process for
approving grading and sediment control plans and stormwater
management plans; and
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- 1153 -
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