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r~ <br />~~ <br /> <br />ATTACHMENT 2 <br />RE: VERIFICATION OF FLOW CAPACITY OF MODIFlED UNDERDRAIN CROSS SECTION <br />The following table provides a summary of the flow calculations through the granular portion of <br />the revised cross section shown as Attachment 1. Flow through the pipes will remain unchanged. <br /> <br /> <br />COMPONENT CROSS SECTION <br />ARFJa <br />(ft~ <br />TOTAL FLOW <br />(gpm} <br />Untlerdrein Pipe Backfill 11.6 447 <br />Underdrain Fill 40.0 6,386 <br />Select Structural FII 10.0 784 <br />Total Granular Area 61.60 7,617. <br />The total flow capacty of the granular material is 7,617 gpm which exceeds the flow capacity of <br />7,343 gpm presented in the Amendment No. 8 permit application. <br />Hardcopies of the three calculation spreadsheets are also Included as a patt of Attachment 2. <br />