Point Precipitation Models to Simulate Water Balance at a Constructed Wetland

by G. B. Shaw, Univ of Cincinnati, Cincinnati, United States,
S. G. Buchberger, Univ of Cincinnati, Cincinnati, United States,



Document Type: Proceeding Paper

Part of: Management of Irrigation and Drainage Systems: Integrated Perspectives

Abstract: We compare two point precipitation models in a water balance simulation performed at a wetland constructed to treat municipal wastewater. The first precipitation model uses a simple Poisson arrival process with exponentially distributed durations and intensities. The second model uses a complex disaggregation process to generate precipitation events. Both models are linked with a program to simulate the water balance at a constructed wetland under the assumptions that seepage losses are negligible, precipitation and evapotranspiration are mutually exclusive and wastewater loadings to the wetland follow a lognormal distribution. Computations are carried out using daily and hourly time steps under humid and arid climatic conditions. We investigate whether or not the complexity of the precipitation model has a significant impact on the hydrodynamic behavior of the constructed wetland.

Subject Headings: Precipitation | Hydrologic models | Wetlands (fresh water) | Water balance | Mathematical models | Simulation models | Water treatment | Seepage

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