Stowa 2017 benchmark (Water Module)

Test case 4

This testcase contains a ponding problem. This testcase is subdivided into 3 sub-testcases in order to investigate several aspects of this ponder problem. Each is described below. See image 5.11 for the layout of the problem. Each surface in this test case has a Manning roughness value of 0.05.

Setup

For each test case the base setup is the same.

• 

  Initial
• 

  After slope adjustments

Test case 4A

In this testcase, the amount of rainfall is similar to testcase 3. However, it continues to rain until the end of the simulation. The surface and underground are impenetrable. And the weir is considered to be 'perfect'.

Results

• Stow2017-testcase4a levels 0h30m.png
• Stow2017-testcase4a levels 1h00m.png
• Stow2017-testcase4a levels 1h30m.png
• Stow2017-testcase4a levels 1h45m.png
• Stow2017-testcase4a levels 2h00m.png
• Stow2017-testcase4a levels 2h30m.png
• Stow2017-testcase4a levels 3h00m.png

Test case 4B

In this testcase the amount of rainfall is 21.6 mm per hour and lasts for 90 minutes. The underground has an infiltration capacity of 10.8 mm per hour. The simulation runs until the water level has lowered to about +/- 2cm below the crest of the weir. The effects of the groundwater table can be ignored.

Test case 4C

In this testcase, the amount of rainfall and the infiltration capacity are equal to testcase 4B. The porosity of the soil is now set to 0.25. The impenetrable layer is strictly horizontal and 10 meters below the lowest surface height. The groundwatertable at t=0 is horizontal, 50 cm below the height of the weir. The initial surface water level is equal to the initial groundwatertable. The hydraulic condictivity is 5x10^-5 for water infiltration from the surface to the underground. The simulation time is equal to testcase 4B.