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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 1 Sanitary Sewer Overflow/Backup Response Packet <br />Volume Estimation: Area/Volume Estimation Method <br /> <br />Note: Refer to form B-4b Page 3 for computation formulas and guides <br /> <br />SSO Date: Location: <br />STEP 1: Describe spill area surface: ☐Asphalt ☐Concrete ☐Dirt ☐Landscape ☐Inside <br />Building <br /> ☐Other: <br />STEP 2: Draw/sketch the outline (footprint) of the spill. Then break the footprint down into <br />recognizable shapes. Refer to the example on form B-4b Page 3. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />STEP 3: Calculate the area of the footprint by completing the table below for each shape in Step 2. <br />If two shapes overlap, select one of the two shapes and estimate the percentage of that shape that does not <br />overlap. Enter that percentage in the % Not Overlapping column. This will ensure that the overlap area is <br />only counted once. Refer to the example on form B-4b Page 3. <br />Rectangles Length X Width X % Not Overlapping* = Area <br />ft X ft X % = ft2 <br />ft X ft X % = ft2 <br />ft X ft X % = ft2 <br /> <br />Triangles Base X Height Multiplier X % Not Overlapping* = Area <br />ft X ft ÷ 2 X % = ft2 <br />ft X ft ÷ 2 X % = ft2 <br />ft X ft ÷ 2 X % = ft2 <br /> <br />Circles π X Radius X Radius X % Not Overlapping* = Area <br />3.14 X ft X ft X % = ft2 <br />3.14 X ft X ft X % = ft2 <br />3.14 X ft X ft X % = ft2 <br />6.2.A. - Page 137