Problem

In CivilStorm and SewerGEMS, why doesn't the flow into the system from a hydrograph load/inflow drop down to zero after the end of the last ordinate in the hydrograph?

Problem Number: 33851

Solution

For a hydrograph, if the last time in the table is less than the total simulation time, the simulation time and last flow will be appended to the hydrograph table. So, it will hold the last flow constant for the rest of the simulation. So, you should either end the hydrograph at zero or extend it to the total simulation duration.

Note that pattern loads are different and will repeat the multipliers for simulation durations longer than the duration of the pattern. For example, if the pattern is 24 hours and the duration is 48, then after 24 hours, it goes back to the first multiplier in that pattern and repeats.

See Also

Inserting user defined flow or hydrograph into the model