Combined water storage and detention system and method of precipitation harvesting and management

A method of maximizing storm water availability for use in a combined water storage and detention (CWSD) system, the system having a plurality of water conduits, remotely controllable water pumps, water storage drain valves, auxiliary bypass discharge valves, and a storage/detention system for storing/retaining a first volume of storm water, the method comprising:

• monitoring a second volume of storm water within the storage/detention system, the second volume being less than or equal to the first volume;
• receiving precipitation parameter data regarding forecasted precipitation predicted to occur at some point in the future, the parameter data comprising a predicted duration, a predicted intensity and a predicted volume (Vpred);
• estimating an expected time-dependent volume of water (Vtd) be added to the system during the forecasted precipitation based on the predicted duration, the predicted intensity and a system fill rate;
• and
• if at least one of:
• a first sum of the predicted volume (Vpred) and the second volume and a second sum of the expected time-dependent volume (Vtd) and the second volume is greater than the first volume then controlling the operating states of the remotely controllable water pumps, drain valves, and auxiliary bypass discharge valves to discharge water from the system until each of the first and second sums is not greater than the first volume.