Abstract

Water balance models can be very useful when establishing the long-term water budget components of an area prior to urban development and the changes in the hydrologic cycle after development. In this case, the water budget components considered include: precipitation; snowmelt and rainfall runoff; evapotranspiration; and surficial and deeper groundwater recharge. Continuous and refinements of the model component routines and future calibration allows for expansion of applicability. The model discussed here has been applied to compute the effects of urbanization on the water balance in a high area and to assess specific control measures for mitigating recharge ons. As part of the first refinement, the evapotranspiration (ET) relation has been enhanced and compared to the original simulation results. This chapter describes the first phase of the development, refinement, and application of a planning-level water balance model.

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