The algorithm used here can also be applied with daily data files when such data are available and then its daily results are more realistic. The climate data used are mean monthly values for a year. The computations are done for several such years in sequence until the computed soil moisture levels in each month stabilize to constant values independent of the year they were computed in. These values then represent expected monthly soil moisture levels on average over a number of years. This is done using a response function.
Several options are available in the program for routing the flow through the river network.
Among these options are a response function approach, the Muskingum Cunge routing method, and a two-step flow routing approach. The two-step flow routing model is a special case of the response function routing model. The two step model is the default model that gets implemented when a user supplied response function is not available or when the Muskingum method is not computationally efficient. Groundwater Flow Modeling Piezometric heads and flows are calculated using a map-based groundwater flow model that applies simultaneously Darcy's law and the continuity equation. The program also provides graphic display of the calculated values in the form of arrows that represent flow direction and magnitude, and of numbers that represent piezometric heads.