-1/1Z <br />'StnrmwaterSurfare Filtratinn/Infiltratinn Facility Si7inn Snreadsheet <br />24 Hour Storm, NRCS Type 1A Rainfall Distribution v. <br />City of Eugene <br />Version 2.1 <br />Project Information <br />Project Name: Oaklei h Meadows Cohousin Date: 3111/2013 <br />Project Address: Oakleigh Lane Permit Number: <br />Eugene, OR 97402 Catchment ID: Rain Garden 9 <br />Designer: Michael A Cox <br />Company: SSW Engineeers Inc. <br />Instructions: <br />1. Complete this form for each drainage catchment in the project site that is to be sized per the Presumptive Approach. <br />2. Provide a distinctive Catchment ID for each facility coordinated with the site basin map to correlate the appropriate <br />calculations with the facility. <br />3. The maximum drainage catchment to be modeled per the Presumptive Approach is f acre (43,560 SF) <br />4.For infiltration facilities in Class A or B soils where no infiltration testing has been perfromed use an infiltration rate of 0.5 in/hr. <br />For all facilities use a maximum soil infiltration rate of 2.5 in/hr for topsoil/growing medium. <br />Design Requirements: <br />Choose "Yes" from the dropdown boxes below next to the design standards requirements for this facility. <br />Pollution Reduction (PR) Yes <br />Flow Control (FC) Yes <br />Destination (DT) No -Aninfiltrationfacility must be chosen as the facility type to meet destination requirements <br />Site Data-Post Development <br />Total Square Footage Impervious Area= 1592 sgft Total Square Footage Pervious Area= 0 sgft <br />Impervious Area CN= 98 Pervious Area CN= 85 <br />Total Square Footage of Drainage Area= 1592 sft Time of Concentration Post Development= min <br />Weighted Average Cl 98 <br />Site Data-Pre Development (Data in this section is only used if Flow Control is required) <br />Pre-Development CN= 85 Time of Concentration Pre-Development= 10 min <br />Soil Data <br />Tested Soil Infiltration Rate= <br />2.5 <br />in/hr (see Note 4) Destination Design= Min/hr ` <br />Design Soli Infiltration Rate= <br />2.5 <br />in/hr Soil Infiltration Rate II <br />Design Storms Used For Calculations <br />Requirement <br />Rainfall Depth <br />Design Storm <br />Pollution Reduction <br />1.41inches <br />Water Quality <br />Flow Control <br />3.61 inches <br />Flood Control <br />Destination <br />3.61inches <br />Flood Control <br />Facility Data <br />Facility Type= Filtration Rain Garden Facility Surface Area= 150 sgft <br />Surface Width=1 61ft Facility Surface Perimeter= 62 ft <br />I <br />Surface Length=1 251ft Facility Bottom Area= 66 sgft I <br />r-ilifv Cid. Q11--l 'lfn , P-1111fv RMt- 113nri-f- rn ft <br />Max. Ponding Depth <br />in Stonnwater Facility= I 61in <br />Depth of Growing Medium (Soil)=l 18 in <br />Basin Volumed 56.2Icf <br />Ratio of Facility Area to Impervious Area= 0.094 <br />3/11/2013-10:56 AM <br />11 423 <br />