User Forum of Software BASEMENT

axel

User

Registered: 2018-05-16

Posts: 1

MinimalWaterDepth

Hello

As part of a study, surface runoff is simulated with basement. Due to small flow depths the parameter MinimalWaterdepth was varied. It was calculated with 1mm, 5mm, 1cm and 2cm. The results show, with a general friction coefficient Strickler 25, that they show big differences. These differcences are located in the discharge maximum, the appearance of the maximum and the volume.

Not shown is the flow depth of a string. This only decreases by 3 cm for modeling with 2cm Minimal Waterdepth. For all other simulations it is the same. The water balances  in the model were monitored and compared to the added rain volume. The calculated waterbalance with 0.5 cm and 1 cm minimalwaterdepth fits very good to the added rain volume, the others vary depending on the calculation in the maximum +/- 8%.

Now I have the following question for the forum:

How can the effect of the large differences in watervolume between the individual calculations be explained? How can it be that I have up to 8% more water (1 mm) in the model as added and up to 8% less water (2 cm) then added?

Thanks in advance
Many Greetings