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I <br /> Downstream Analysis <br /> Powdermill Gulch Creek <br /> IAs shown below, site runoff connects to the conveyance system within 23`d Drive W and is then <br /> conveyed to the west beneath 60`h St SW to the existing detention pond. The pond outfall <br /> Idischarges to Powdermill Gulch Creek. <br /> •' 0, '?- £ <br /> �u s <br /> Powdermill , <br /> 't Gulch Creek a 1 , 60`h St SW <br /> �� � <br /> - e a 23'd Dr W <br /> ' ' s ' S , ��a ' , rhS;Na T bnh 4 w., ig . <br /> gP' r.✓ l G^yy6.5 K <br /> ‘,%:i'A',,,", -e,k 4'4*'•' , , ry,„, 1 <br /> a „, 5 ,, % k ® '/%-�. .... ;' e: /Ors.' '' .,,.�p"+y, ,a a <br /> 3 r „<y-, s .;.c. "mow r�5 <br /> Existing Pond d e'� • <br /> Site <br /> 01 <br /> s; <br /> I <br /> Narbeck Creek <br /> IThe downstream analysis for Narbeck Creek was performed by PACLAND on March 14, 2008 for <br /> the development of Lot 3C. The weather was overcast with showers and the temperature was <br /> Iapproximately 44 degrees. <br /> Runoff currently sheet flows off of Lot 36-1 and onto Lot 36-2 and collected by surface drainage <br /> I and conveyed north thru Lot 3C to Lot 3D where the common outfall discharges the flows into <br /> Narbeck Creek. <br /> I In the developed condition, the onsite stormwater outfall for the Narbeck Creek basin will connect <br /> to the StormFilter structure on Lot 36-2. Per the letter from Contech in Appendix 6, this <br /> connection will not affect the function of the Lot 36-2 StormFilter. <br /> IPictures 1 — 7 represent this downstream analysis. <br /> I <br /> I6/16/2011 Stormwater Site Plan Page 18 <br />