Patent ID: 7186058

Claim:
A stormwater runoff detention system, comprising: a tank system at least in part defining: a first surge volume, a second surge volume and at least one storage volume that is substantially greater than each of the first surge volume and the second surge volume, the first surge volume is in fluid communication with a discharge outlet of the tank system to permit stormwater to exit the tank system at a rate not to exceed a first permitted flow rate, the first surge volume is in fluid communication with the at least one storage volume to permit stormwater to enter the at least one storage volume when inflow rate to the first surge volume exceeds the first permitted flow rate; the second surge volume is in fluid communication with the discharge outlet of the tank system to permit stormwater to exit the tank system, wherein stormwater exiting the tank system from the first surge volume and the second surge volume does so at a rate not to exceed a second permitted flow rate that is greater than the first permitted flow rate, the second surge volume is in fluid communication with the at least one storage volume to permit additional stormwater to enter the at least one storage volume when combined inflow rate to the first surge volume and the second surge volume exceeds the second permitted flow rate.