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Basin-Wide Stormwater Management in Pennsylvania?A Case Study of Hydrologic Performance Standards

by T. R. Pysher, Sweetland Engineering &, Associates, Inc, State College, United States,
D. F. Kibler, Sweetland Engineering &, Associates, Inc, State College, United States,
M. N. Mather, Sweetland Engineering &, Associates, Inc, State College, United States,
J. P. Mazich, Sweetland Engineering &, Associates, Inc, State College, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Performance standards in the form of 'release rates' are developed using hydrologic computer models. This basin-wide approach to stormwater management considers the impact of increased runoff on downstream areas; therefore, it is more comprehensive than conventional on-site stormwater management that maintains post-development peak discharges at pre-development levels. This paper reviews the release rate concept and provides a comparison of the downstream effects of basin-wide and conventional on-site stormwater management. A case study of the Little Plum Run watershed in Clinton County, PA provides a practical application of release rates. This paper also presents a sensitivity analysis of the effect of various hydrologic computer model input parameters on release rates for the Little Plum Run watershed.

Subject Headings: Stormwater management | Computer models | Hydrologic models | Case studies | Watersheds | Sensitivity analysis | Runoff

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