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Page 1 of 1 <br />Roger Fong <br />From: Stephanie Conran Lsconran @swsv.com] <br />Sent: Wednesday, July 08, 2009 2:45 PM <br />To: Eddie Sieu; Roger Fong <br />Cc: Jim Schaaf <br />Subject: Staples Ranch Basin <br />Attachments: Staples_BAHMoutput070709,pdf <br />Using the impervious areas and the basin plan as provided, the basin is adequate. We did not optimize the outlet <br />or geometry, but using an outlet with an orifice at the lowest point In the pond (335.2) of 5.5" and 24" riser at <br />elevation 342 suffices, With this outlet structure, BAHM shows the hydrographs adequately modified and a total <br />basin volume of approximately 15 ac -ft (el 344.5). This provides 3' of freeboard to the top of slope. <br />The breakdown of impervious surfaces were estimated and will need more thorough accounting for final design <br />calculation. Volumes were estimated as well using simple calculation based on the supplied autocad drawing. If <br />there are some basin volume calculations already, it would be wise to compare them to what was used in the <br />storage - elevation- discharge curve to ensure that there were no Issues with scaling and such. <br />The BAHM output attached. Please note that the pond used is "SSD Table 1 ", "Trapezoidal Pond" was used for <br />intermediate calculations and Is not connected to the system hydraulically. <br />• <br />