Environmental Engineering Reference
In-Depth Information
Figure B-1 First national effort to develop an NPS manual (EPA/NOAA).
2. Limit increases of impervious areas, except where necessary.
3. Limit land disturbance activities such as clearing and grading, and cut and
fill to reduce erosion and sediment loss.
4. Limit disturbance of natural drainage features and vegetation.
The end result of many months of discussion by several dozen experts was a
massive compendium of papers on a broad range of related (and unrelated) sub-
jects, some of which were in conflict with each other. By and large, the detention
systems received the most treatment, and the volume-reduction technologies were
given only passing consideration. As an initial effort to pull together the collec-
tive experience of reducing NPS pollution, it did serve to demonstrate the state of
understanding after almost two decades of effort, and led to much better efforts
to prepare a guidance document by a number of states over the following decade.
This document was published by U.S. EPA, Office of Water, Washington, DC
20460, in January 1992.
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