The user-specified hyetograph method is for precipitation data analyzed outside the program. The gage weights method uses an unlimited number of recording and non-recording gages. The Thiessen technique is one possibility for determining the weights.
The inverse distance method addresses dynamic data problems. An unlimited number of recording and non-recording gages can be used to automatically proceed when missing data is encountered. The gridded precipitation method uses radar rainfall data. Four different methods for producing synthetic precipitation are included. The frequency storm method uses statistical data to produce balanced storms with a specific exceedance probability. The standard project storm method implements the regulations for precipitation when estimating the standard project flood.
The user-specified hyetograph method can be used with a synthetic hyetograph resulting from analysis outside the program. Potential evapotranspiration can be computed using monthly average values.
There is also an implementation of the Priestley-Taylor method that includes a crop coefficient. A gridded version of the Priestley-Taylor method is also available. Snowmelt can be included for tracking the accumulation and melt of a snowpack. A temperature index method is used that dynamically computes the melt rate based on current atmospheric conditions and past conditions in the snowpack.
The time span of a simulation is controlled by control specifications. Control specifications include a starting date and time, ending date and time, and a time interval. A simulation run is created by combining a basin model, meteorologic model, and control specifications.
Run options include a precipitation or flow ratio, capability to save all basin state information at a point in time, and ability to begin a simulation run from previously saved state information. Simulation results can be viewed from the basin map. Global and element summary tables include information on peak flow and total volume. A time-series table and graph are available for elements.
Results from multiple elements and multiple simulation runs can also be viewed. All graphs and tables can be printed. Most parameters for methods included in subbasin and reach elements can be estimated automatically using optimization trials.
Observed discharge must be available for at least one element before optimization can begin. Parameters at any element upstream of the observed flow location can be estimated. Six different objective functions are available to estimate the goodness-of-fit between the computed results and observed discharge.
Two different search methods can be used to minimize the objective function. Constraints can be imposed to restrict the parameter space of the search method. Analysis tools are designed to work with simulation runs to provide additional information or processing.
Currently, the only tool is the depth-area analysis tool. It works with simulation runs that have a meteorologic model using the frequency storm method.
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