Sensitivity of water management models to approaches for determining soil hydraulic properties
1994
Workman, S.R. | Skaggs, R.W.
Data that define the relationships between the soil-water content (theta), hydraulic conductivity (K), and tension (h) are important inputs to hydrologic models, however, they are difficult to measure and are often estimated from more easily determined soil physical properties. This article presents comparisons of using measured versus estimated (h) and K(h) data to simulate evapotranspiration, infiltration, runoff, and drainage with the PREFLO and DPAINMOD water management models. Both models reacted similarly to the estimated data by altering the simulated volumes of ET and drainage. The models were most sensitive to differences in the K(h) data at tensions between 0 and 1.5 m. PREFLO was more sensitive than DRAINMOD to the saturated water content estimated from soil texture. The ability to simulate soil-water storage and movement with PREFLO or DRAINMOD was more a function of input data accuracy than the model.
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