Triangular Unit Hydrograph Convolution
This model uses a convolution element to solve for the runoff rate from rainfall
based on a triangular unit hydrograph. The only input parameters are the time to peak runoff rate, the time from peak runoff to end of runoff, a runoff coefficient, the rainfall rate, and a catchment area. This is a very simple runoff model that may work in some simple situations, such as runoff from an impervious area. It is not ideal for systems with baseflow or systems where there is storage that creates runoff dependency on antecedent soil moisture.
Screenshots from the Model
A triangular unit hydrograph response to a pulse of rain is shown below:
Download the model file