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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 />RECTANGLECIRCLETRIANGLE <br />H <br />W <br />E <br />I <br />I <br />D <br />G <br /> DIAMETER <br />T <br />H <br />H <br />T <br />LENGTHBASE <br />Rectangle: Area = length X width <br />2 <br />Circle: Area = 3.14 X Radius <br />Triangle: Area = ½ 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 /> <br />