Document PIHM manual calibration
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Manual calibration of PIHM consists of 3 components: parameters controlling lateral groundwater flow, parameters controlling infiltration, and the snow accumulation / melt model.
Parameters Controlling Lateral Groundwater Flow
Parameters controlling lateral groundwater flow are taken to be horizontal saturated hydraulic conductivity, KsatH, horizontal macropore hydraulic conductivity, MacKsatH, and macropore depth, MacD. The soil thickness, another important parameter, is held at an assumed value. Models are run forward from an initial state of completely saturated soil using all meteorological forcings (except precipitation) to capture the steepening effect of ET on the slope of the recession curve. The "observation" stream discharge is taken to be the time-dependent solution to the power law that best fits the observed stream hydrograph. The graphic solution below illustrates how the different parameters impact the shape of the modeled recession curve.
