In Australia, most storages ...

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In Australia, most storages designed for irrigation and many for urban supply have the dual purpose of both flood and drought control.  These have various amounts of success depending on such criteria as, (1) the size of the storage, (2) the years of average flow to fill that storage, (3) the size of the catchment, (4) rainfall patterns, (5) recurrent intervals to 1 in 100 years storms and (6)intensity, duration and frequency of those storms.  There are other criteria, but understanding that such variables produce a multitude of different possible outcomes also underlines the necessity to engage specialist hydrologic advice with statistical stacastic modeling made available to back up any design.  Please note, any large water storage should have both components for flood and irrigation supply and any storage should not be designed without both as the cost to build such structures is now astronomical.  I am Lippy.  Hear me roar.