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, r <br /> V <br /> 4.2 Downstream Analysis <br /> Based on existing topographic information,the on-site storm drainage naturally sheet flows west. <br /> Stormwater runoff on-site is captured by catch basins and conveyed into the combined sewer <br /> system consisting of 12-inch to 21-inch concrete pipe. The combined sewer system on this site <br /> conveys stormwater and wastewater toward the southeast where it exits the property. The <br /> stormwater will continue to be conveyed south through Wiggums Hollow Park in the combined <br /> sewer system within concrete pipe ranging from 30 inches to 60 inches. The figure below <br /> demonstrates the stormwater conveyance path up to a half mile downstream of the project site. <br /> Storm drainage from the developed site will be detained in a rain garden to allow for water <br /> quality treatment, infiltration, and evaporation before overflow is routed to the existing combined <br /> sewer system. <br /> • Y: �" __PROJECT SITE <br /> /J \� et- <br /> 4 ° -iF..c_k '„ I 1ziCPl •.- ice / \ <br /> >/(/'" . ' - '''' - , <br /> 411# <br /> i21 cP <br /> may . - ',i4,4+ M t,,. <br /> A, <br /> 3a GQ # I e N,.f s , a , , ;.# <br /> y' t• •., i <br /> " ry ce <br /> .40 <br /> 1 yr, 10 Y x�4�'.s ' OF y— w t Sai <br /> z �.J <br /> M Y..p ♦e- Iti; f klilL ..1 <br /> eri 4 b 'C ''i I :1,2 MILE,. <br /> ' ° O' 0 / DOWNSTREAM ,, <br /> +{x <br /> 1 .y I , lis `^ <br /> Figure 3: Downstream Analysis <br /> DAVID EVANS AND ASSOCIATES,INC. <br /> GRANDVIEW APARTMENTS CLUBHOUSE MARCH,2017 <br /> STORMWATER SITE PLAN PAGE 8 <br />