SWMM-UrbanEVA: A Model for the Evapotranspiration of Urban Vegetation

Urban hydrology has so far lacked a suitable model for precise long-term determination of evapotranspiration (ET) addressing shading and vegetation-specific dynamics. The proposed “SWMM-UrbanEVA” is fully integrated into US EPA’s Stormwater Management Model (SWMM) consists two submodules. Submodule 1, “Shading”, considers the reduction in potential ET due to effects. Local variabilities impacts can be addressed both pervious impervious catchments. 2, “Evapotranspiration”, allows spatio-temporal differentiated simulation vegetation maps dependencies on vegetation, soil, moisture conditions which are necessary realistically modeling vegetation’s water balance. tested parameter sensitivities, validity, plausibility behaviour shows good performance Depending location remarkable improvements total volume errors Vol (from = 0.59 ?0.04% coniferous) dynamics, measured by Nash–Sutcliffe efficiency (NSE) NSE 0.47 0.87 observed. most sensitive inputs factor KS crop KC. Both must derived very carefully minimize errors. Another focus set soil parameters since they define available ET. Process-oriented differentiation between fluxes interception evaporation, transpiration, using leaf area index, behaves but lack Further investigations process validation, parametrization recommended.