With the User Defined method of hydrograph generation, you specify the number of ordinates for a dimensionless unit hydrograph and then define the t/tc and Q/Qp values.
NOTE: All t/tc values must be even integers.
User defined files may be exported or imported so that they do not need to be re-entered from one run of WMS to the next.
Related Topics:
Computing Hydrographs with Rational Method
Rational Equation