Laserfiche WebLink
C <br />Project: North County Recycling Center and Sanitary Landfill - Non -Water Release Corrective Action Plan <br />Client: County of San Joaquin <br />Job No.: 2013.A135 <br />Calc'd By: NC <br />Date: 2/24/2014 <br />DOWNDRAIN ANALYSIS <br />Note: <br />1) Runoff 00 -Year storm event from Preliminary Closure and PostClosure Maintenance Plan prepared by Shaw Environmental, Inc., January 2010. <br />2) Allowable headwater estimated from details in the Preliminary Closure and PostClosure Maintenance Plan drawings prepared by Shaw Environmental, Inc., January 2010. <br />Page 1 of 3 <br />Calculated Runoff <br />Design Downdrain Dimensions <br />Allowable <br />Max Discharge <br />100-Year(l) <br />1000 -Year <br />Diameter <br />Number of <br />Slope <br />Headwater (2) <br />Inlet <br />Barrel <br />Downdrain <br />(cfs) <br />(cfs) <br />(in) <br />Barrels <br />(ft/ft) <br />(ft) <br />(cfs) <br />(cfs) <br />Notes <br />Downdrain capacity is insufficient at inlet <br />DD1 <br />23.0 <br />30.4 <br />24 <br />1 <br />0.0500 <br />4.00 <br />29.1 <br />27.4 <br />and through barrel. <br />32.9 <br />43.1 <br />30 <br />1 <br />0.0500 <br />4.50 <br />46.7 <br />49.7 <br />Downdrain capacity is sufficient. <br />Downdrain capacity is insufficient at inlet <br />44.5 <br />53.2 <br />30 <br />1 <br />0.0500 <br />4.50 <br />46.7 <br />49.7 <br />and through barrel. <br />56.2 <br />63.1 <br />36 <br />1 <br />0.0500 <br />5.00 <br />69.0 <br />80.8 <br />Downdrain capacity is sufficient. <br />65.4 <br />71.0 <br />36 <br />1 <br />0.0500 <br />5.00 <br />69.0 <br />80.8 <br />Downdrain capacity is insufficient at inlet. <br />Downdrain capacity is insufficient through <br />DD2 <br />10.7 <br />13.7 <br />18 <br />1 <br />0.0500 <br />3.50 <br />15.3 <br />12.7 <br />barrel. <br />15.9 <br />20.3 <br />24 <br />1 <br />0.0500 <br />4.00 <br />29.1 <br />27.4 <br />Downdrain capacity is sufficient. <br />Downdrain capacity is insufficient through <br />25.0 <br />27.8 <br />24 <br />1 <br />0.0500 <br />4.00 <br />29.1 <br />27.4 <br />barrel. <br />35.1 <br />36.4 <br />30 <br />1 <br />0.0500 <br />4.50 <br />56.7 <br />49.7 <br />Downdrain capacity is sufficient. <br />44.2 <br />44.2 <br />30 <br />1 <br />0.0500 <br />4.50 <br />56.7 <br />49.7 <br />Downdrain capacity is sufficient. <br />Note: <br />1) Runoff 00 -Year storm event from Preliminary Closure and PostClosure Maintenance Plan prepared by Shaw Environmental, Inc., January 2010. <br />2) Allowable headwater estimated from details in the Preliminary Closure and PostClosure Maintenance Plan drawings prepared by Shaw Environmental, Inc., January 2010. <br />Page 1 of 3 <br />