Dear All,
I am attempting to carry out a dynamic unsteady state simulation to model the dynamic response of a located mid-way pond in an ephemeral wadi stream that is subjected to a sporadic flooding hydrograph. What is requested is to identify the part of the flood water volume that will succeed to pass by the pond and to identify also the second part that would be trapped by the pond and would not succeed to cross the pond and to enter the downstream wadi reach located d/s of the pond.
In order to do so, I have used the cross section approach to deal with the pond (not the storage, pool-level, approach) because I do need some more flow details to be calculated at the pond sections.
I’ve started with a dry pond initial condition however I figured out that Hec-ras automatically disregard the initial dry condition and on purpose fill the pond initially and thus no part of the incomming flow is intercepted by the pond despite that the pond has a significant volume to intercept at least 50% of the coming water volume.
Can some body guide me regarding how to deal with that issue.
If hec-ras can not model the initially dry sections then how to use it to model the initially dry ephemeral wadies and how to deal with all its local ponds. does it work with the inundation mapping which basically means wetting the drying areas?
Best Regards
M. Elgamal