I am working on a flood control project where we are trying to route approx. 4,000 cfs (Q100) from mountainous watershed through a series of detention basins and then through a channel at the foothills. We are designing 4 basins with orifice control outlet pipes between the berms for low flows. The basins do not have enough capacity to hold the 100 year storm volume (2500 ac-ft). 100 year peak discharge would spillover to the basin downstream and this process continues till it reaches the channel after the fourth basin. Emergency spillover berms are designed to carry the flow from one basin to the other. My questions - Do I still need basin routing analysis? How do I do that for multiple basins? Is there a program or spreadsheet out there that can do multiple basin routing? Or since the emergency spillways handle the flow rate, there is no need for basin routing analysis? Appreciate responses.
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