A flood carries a discharge 5 m 3 /s into a coastal riparian wetland. Upstream o

Question

A flood carries a discharge 5 m3/s into a coastal riparian wetland. Upstream of the wetland, the flood is a bankfull flow (the channel can just contain all the flow). The channel in the wetland, however, is smaller, and the flow goes out of bank..

Channel Discharge: If the wetland channel dimensions are: depth = 0.5 m, width = 8.0 m, and velocity = 0.5 m/s, what is the discharge (in m3/s) that can be contained within the wetland channel?

Floodplain Q: If total Q is 5 m3/s, how much of this discharge will be not be contained within the channel and thus will be carried by the floodplain/wetland?

The average width of the wetland floodplain is 60 m and the floodplain surface gradient is 0.0005 m/m. Use the floodplain discharge that you calculated to estimate the depth and velocity of flow on the floodplain. The floodplain is covered with cypress trees that have an average Manning’s n of 0.25.

Stream residence time:   What is the travel time of parcels of water that travels in the channel for a travel distance of 500 m?. Use channel velocity that you calculated above.

Wetland residence time: What is the travel time of water on the floodplain to travel the same 500 m distance.   (use the velocity calculated in problem c).

Explanation / Answer

A flood carries a discharge 5 m 3 /s into a coastal riparian wetland. Upstream o

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