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r <br /> a <br /> !; Stonmvater collecred on the lots�vill be conac}ed to the storm"�ater infi]tra[ion/de[ention pond <br /> located at [he north cnd of the site. Stormwater from Associated�oulevard will 6c conveycd in <br /> a separate s}'stem to the proposed infiltration/detention pond. <br /> I � � Stormwatcr from thc FSA site �vithin the Glenu-ood Crcek basin wil] also be routed to the <br /> I '�I proposed infiltration/detention pond. Storm�eater from the FSA site is treated and detained to <br /> j) stream p:-otection standards prior to entering the proposed storm«�ater sys?em. <br /> I � 7chle 2- Sitc Bosin Conditions <br /> � }' Basin Bosin ID Pervious Area CN Impervious Aren CN Total Arco <br /> ` t� Candilion (AC) (ACl (A.C) <br /> � Forested Site 66.9 7G U.00 98 G6.9 <br /> � j Develo ed S:te 6.7 56 C-0.2 9S 669 <br /> � r� <br /> �'C/L. -�. ���1 <br /> I �� Precipitafion Data <br /> I .� The follo�aing indicates rainfall depths for the 6-month,2-year, and 100-year, 24-hour duration <br /> storms Gom [nc City of��•crett Stornnrater h9anngement hlan.taL• <br /> p Desien Storm Rainfall D:�th inchcsl <br /> �� 6-month, 24-hour 0.99 <br /> 2-ycar, 24-hour 1.55 <br /> � 10-ycar, 24-hour 2�� <br /> 100-year, 24-hour � 3.ti <br /> �I Flow Control System <br /> l, StormSHi:D hydrolo�ic modcl �ti�as uscd to dcsign the proposcd regional infiltration/dcten[ion <br /> pond. Procedures and design criteria specifed in the 1997 City of Lverett Stannrn(er <br /> I � Mmtagement binnrinl���erc followed for h}'drologic modcling. Descriptions of the stormwater <br /> system .nd details of tiie design analysis are provided belo���. <br /> Hydrologic model input and outpu[ (or the site under forested conditions (Subbasin "site ') and <br /> � undcr proposed dcvcloped conditions (SubUasin "SI'rG") arc listcd in Appendix B. Although thc <br /> site has been excavatcd under past mining activity, the arca was considered to be forestcd in <br /> ilmodeling thc hydroingy. The s�tc was modeled as IIydrologic Scil Group C. Forested arcas <br /> •� were 2ssigned a cun�e numbcr of 76. For deacloped conditions, la�idscaped and la�co area���cre <br /> assigned a curce number of RG. <br /> �1 <br /> �� Stornin•at�r frnm the dcvclopmcnt ��•ill hc man;�ged �ti'ith an infiltration/detention pond designcd <br /> to mect Stre.unbank rrosion Control slandards. A plan �'ic��' and details of the st�nmti•:iter sys!em <br /> ! �� <br /> .� CSRAisauoted6oulevvd Rerurlk�e2C-0I <br /> + Sla�wclttFte%m '�' � 'I � '� �.O <br /> I <br />