b'STORMWATERCATALOG A submerged oil/floatable baffle is located around the effluent pipe to allow for the capture and containment of these pollutants.Collected pollutants will remain in the interceptor until removal.Because no filter cartridges are required operating costs are minimal.Furthermore, the StormTrooper System has no moving parts substantially reducing maintenance costs. Selection CriteriaUse when space constraints make installation of a surface treatment system infeasibleAchieves greater than 80% TSS removal when properly sized, so can be used as a standalone BMP, as well as in a treatment trainProvides smallest footprint possible and safest entryAppropriate for retrofits as well as new developmentLimitationsBelow grade installation requires pump out to remove accumulated sediment and other pollutantsManhole covers must be removed to determine whether maintenance is requiredRequires regular maintenance for optimum efficiently3.4.20StormTrooper Design Criteria As a flow-based BMP, the StormTrooper is designed using the treatment flow rate for the site, as calculated using the Rational Method. The runoff rate from the tributary area is calculated using Equation 3.4:Q = CIA Where: Q = flow rate (ft 3 /s) C = runoff coefficient for the tributary area I = design rainfall intensity (1.1. in/hr) A = drainage area (ac)The runoff coefficient is calculated as the weighted average of the impervious and pervious areas. Runoff coefficient for impervious areas is assumed to be 0.90 and the runoff coefficient for pervious areas is assumed to be 0.03. The overflow rate (hydraulic loading rate) is calculated using Equation 3.5: V OR= Q/A Where: V OR= overflow rate (ft/s) Q = runoff rate calculated with Equation 3.4 (ft 3 /s) 11-32376 INFO@PARKUSA.COM|888-611-7275|WWW.PARKUSA.COM'