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• <br /> An Engineedng Services Company <br /> BMP 12.40 has been implemented as a bioretention system to collect parking run off. <br /> BMP 12.50 Downspout Dispersion Systems <br /> Downspout dispersion systems are gravel-filled trenches or splash blocks, which serve <br /> to spread roof runoff over vegetated pervious areas. Dispersion attenuates peak flows <br /> by slowing entry of the runoff into the conveyance system, allows for some infiltration, <br /> and provides some water quality benefits. <br /> BMP 12.50 for dispersing roof runoff is not feasible due to a lack of an adequate flow <br /> path to disperse roof runoff. <br /> BMP 12.60 Concentrated Flow Dispersion <br /> Dispersion of concentrated flows from driveways or other pavement through a vegetated <br /> pervious area attenuates peak flows by slowing entry of the runoff into the conveyance <br /> system, allows for some infiltration, and provides some water quality benefits. <br /> BMP 12.60 is not feasible due to the lack of sufficient flow path available to disperse the <br /> runoff. <br /> Starbucks Page 7 <br /> Broadway and 10th Store <br /> Drainage Report <br /> May 2014 <br />