Evapotranspiration Crop Coefficients for Cattail and Bulrush
Publication: Journal of Hydrologic Engineering
Volume 9, Issue 3
Abstract
Accurate estimates of evapotranspiration from constructed wetlands are required to establish design flow estimates and to assess the effectiveness of wetland water quality amelioration. Water consumption by two wetland plant species, Typha latifoilia (broadleaf cattail) and Scoenoplectus acutus (hardstem bulrush), was measured in a greenhouse for eight months. Measurements of actual evapotranspiration from replicates of both plant treatments were related to potential evaporation as approximated by evaporation from saturated gravel beds. Ratios of to were used to develop crop coefficients for each plant species. The relationship between cattail and the ratio of vegetative to open water surface area agreed with previous investigations. A linear relationship was used to account for advective energy fluxes due to peripheral canopy area. Cattail crop coefficients were scaled according to this relationship. The resulting scaled crop coefficient curve may be transferable to constructed wetlands of a known
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Copyright © 2004 American Society of Civil Engineers.
History
Received: Oct 1, 2002
Accepted: Jul 16, 2003
Published online: Apr 15, 2004
Published in print: May 2004
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