b'How it worksThe function of the StormTrooper system is to intercept free oils andWater Quality Flow is:sediments from stormwater runoff and retain them for periodic removal.WQq = (qu) (A) (WQv) Each system is designed for a rated ow rate capacity of stormwater,WQv = Rv * i (inches) known as the initial rst-ush ow of a storm event. This rst-ush willA = area (impervious area in sq miles)contain the majority of the pollutants washed from the catchment areas.qu = unit peak discharge for NRCS Runoff can range from low to very high ow rates. High ows can beType III storm distributiondetrimental to stormwater treatment devices in that excessive ows tend to scour and resuspend the existing retained pollutants left fromRv = volumetric runoff coefcient the previous storm event. The StormTrooper utilizes engineered bypass=(0.05 + (0.009 ( % impervious))features to handle excessive ows, permitting only the design owi = rainfall intensitythrough the interceptor while bypassing high ows to the storm sewer.Example: A 2.75 acre gas station, Normal Runoff Flow in Austin TX, with 0.75 acres Stormwater enters the StormTrooper through the control manhole withdrainage basin of 100 percent one or multiple inlets and/or a grate inlet. The inlet invert guides theimpervious cover needs a treatment ow into the interceptors rst chamber where the water velocitytreatment device that will hold is signicantly reduced, creating non-turbulent conditions. Here, buoyanta minimum of 750 gallon fuel spill materials rise to the surface and heavy solids start to settle. As the waterduring dry conditions and the ows to the second compartment, it must travel through coalescent mediaability to treat the Water Quality where hydrodynamic coalescence occurs. During this laminar ow period,Volume (WQv) for the drainage hydrocarbons separate and rise to the upper region of the interceptor.basin. The StormTrooper is sized Sediment particles do the opposite, as they are separated and sink to theusing a ow rate. Using the above interceptor bottom region. All pollutants remain in these lower and uppermethodology converts the required regions, where they are securely detained until they are removed duringWater Quality Volume to a maintenance. The water exits the interceptor to the control manholesdischarge rate for sizing purposes. outlet compartment and then continues to the storm sewer. The calculated WQq of 0.33 cfs High Runoff Flow is the controlling factor for sizing The StormTrooper has a ow limiter which ensures that the ratedthe unit. The StormTrooper model ow capacity is not exceeded through the interceptor. During high ow,HMI-125 is recommended.runoff enters the control manhole where water builds and rises in theWhere:control manholes inlet compartment. The excess runoff that does noti = (0.5 + ((A impervious / A total) ow into the interceptor will ow through a trash screen and over the- 0.2)) = 0.57 inches*bypass weir. In the control manholes second compartment, the bypassedRv = 0.05 + (0.009 * 80) = 0.77ow and the treated ow from the interceptor merges and then exits to the storm sewer. WQv = 0.77 * 0.57 = 0.439 watershed inchesVisit hmi.parkusa.com for more information and design assistance. qu = 677 cfs/mi^2/watershed inches StormTrooper is protected by US Patents #7,470,361, 7,780,855 & Trademark Reg #2628121.WQq = (qu) (A) (WQv) WQq = (677) (0.001172) (0.439) = 0.33 cfsPeak WQq Spill Capacity Total Volume StormTrooper *25-8-213 (B) Water Quality Control Standard, (cfs) (gal) (gal) ModelCity of Austin0.282 750 1,500 HMI-1000.352 1,600 3,200 HMI-1250.422 2,000 4,000 HMI-1500.493 3,000 5,900 HMI-1750.563 3,200 6,400 HMI-2000.634 3,800 7,600 HMI-225Model OSVOilStop Valve is protected by US Patent #9,963,358APPLICATIONSGood to useFueling Industrial Parking Lots Low ImpactGreen in BMPsDepotsStreets & HighwaysDevelopmentInfrastructure'