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© 2004-2016 DKF Solutions Group All rights reserved. <br /> <br />City of Redwood City: Overflow Emergency Response Plan B-3b <br />Page 3 Sanitary Sewer Overflow/Backup Response Packet <br />Volume Estimation: Area Volume Estimation Method <br /> <br />Miscellaneous Computations <br />To convert inches to feet Divide the inches by 12 or use the chart on the bottom right of this page. <br />Volume of one cubic foot 7.48 gallons of water <br />Area: <br />Two-dimensional <br />measurement <br />represented in square feet <br />Square/rectangle: Area = Length x Width <br />Circle: Area = πr2 (where π ≈ 3.14 and r = radius = ½ diameter) <br />Triangle: Area = ½ (Base x Height) <br /> <br />Volume: <br />Three-dimensional <br />measurement <br />represented in cubic feet <br />Rectangle/square footprint: Volume = Length x Width x Depth <br />Circle footprint (cylinder): Volume = πr2 x Depth <br /> (where π ≈ 3.14 and r = radius = ½ diameter) <br />Triangle footprint: Volume = ½ (Base x Height) x Depth <br />Depth: <br />Contained or “Ponded” <br />sewage <br /> <br />Measure actual depth of standing sewage whenever possible. When depth <br />varies, measure several representative sample points and determine the <br />average. Add the depth of the sample points and then divide that total by the <br />number of sample points. <br />If the depth is not measurable because it is only a wet stain, consider using the <br />following estimated depths: <br />• Depth of a wet stain on concrete surface: 0.0026’ (1/32”) <br />• Depth of a wet stain on asphalt surface: 0.0013’ (1/64”) <br /> <br /> <br /> <br />6.2.A. - Page 141