THE LEGAL BASIS FOR LID: REGULATORY STANDARDS AND LID DESIGN CRITERIA - Low Impact Development and Sustainable Stormwater Management - page 105

Figure 5-3 Stream bank erosion from development.
Figure 5-4 Increased bankfull frequency with increased imperviousness.
3. Prevent downstream increases in volume and flooding impacts . Although
site-based rate control measures may help protect the area immediately down-
stream from a development site, the increased volume of runoff and the prolonged
duration of runoff from multiple development sites can actually increase peak
flow rates and duration of flood flows from runoff caused by small rain events.
Replicating predevelopment runoff volumes for small storms frequently does not
address flooding from large storms, but it will reduce substantially the problem
of frequent flooding which affects many communities.