EcoService Models Library (ESML)

Document: P8 Urban Catchment Model Version 3.5 (Doc-377)

377
Authors
Walker, W. Jr., and J.D. Walker
Year
2015
Title
P8 Urban Catchment Model Version 3.5
Document Type
Web Page
Place Published
Concord, MA
Abstract
P8 simulates the generation and transport of stormwater runnoff pollutants in urban watersheds. Continuous water-balance and mass-balance calculations are performed ona user-defined drainage styem consisting of the following elements: Watersheds Devices, Particles, Water quality components. Simulations are driven by hourly precipitation and daily air temperature time series. Runoff contributions from snowmelt are also simulated. 'P8' abbreviates "Program for Predicting Polluting Particle Passage Thru Pits, Puddles, and Ponds", which more or less captures the basic features and functions of the model. It has been developed for use by engineers and planners in designing and evaluating runoff treatment schemes for existing or proposed urban developments. Design objectives are typically expressed in terms of percentage reduction in suspended solids or other water quality component. Despite its limitations, P8 has been used by state and local regulatory agencies as a consistent framework for evaluating proposed developments. Depending on applications, other models could be either too simple (easily used, but ignoring important factors) or too complex (requiring considerable site-specific data and/or user expertise). P8 attempts to strike a balance to between those extremes. Predicted water quality components include total suspended solids (sum of the individual particle fractions), total phosphorus, total Kjeldahl nitrogen, copper, lead, zinc, and total hydrocarbons. Simulated BMP types include detention ponds (wet, dry, extended), infiltration basins, swales, buffer strips, or other devices with user-specified stage/discharge curves and infiltration rates. A simple water budget algorithm can be used to estimate groundwater storage and stream base flow in watershed-scale applications.
URL Exit
http://www.wwwalker.net/p8/v35/webhelp/p8HelpWebMain.html
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