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1. Draw an outline of the spill, and then break the footprint down into recognizable shapes. Then <br />calculate the area of each shape <br />RECTANGLE CIRCLE TRIANGLE <br />AL AL <br />E <br />I I <br />D DIAMETER G <br />T H <br />H � T <br />LENGTH BASE <br />• Rectangle: Area = length X width <br />• Circle: Area = 3.14 X Radius2 <br />• Triangle: Area ='/2 X (Base X Height) <br />2. Measure the depth of the liquid in multiple areas to calculate the average depth. <br />3. Calculate the total volume in gallons. <br />(Area X Depth X 7.48) = Total Gallons <br />MANHOLE COVER FLOW MEASUREMENT <br />1. Refer to Appendix D for determining volume based on manhole pick holes and vent holes. <br />REVISION 2.0 (4/23) 18 <br />