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<br />III Illlllllllllllll <br />999 <br />IiEN CASTLE ffiJSItGY <br />William P. Van Liew, P.E. <br />12/19/90 <br />Evaluation o! SMALL Diameter Pipe Potentially Restricting <br />Area For 81ow Through a Drainage Culvert <br />Diameter of small pipe = 2 in. nominal <br />Outside diameter of small pipe = 2.375 in.' <br />Outside Area of small pipe = 4.430 inZ = 0.030765 ft2 <br /> ~( 2 <br />Diameter o! Area o! Percentage o! Culvert <br />Culvert Culvert Area Taken IIP by 8ma11 <br />(inJ (ft2) Pine <br /> <br />12~ 0.785 3.9$ <br />18 1.767 1.7$ <br />24 3.142 1.0$ <br />3D" y.~r o ~3.~ <br />36 7.069 0.4$ <br />42 9.621 0.3$ <br />•Reference: Driscoll, Fletcher G., 1986, Groundwater and <br />Wells. Second Edition, Johnson Division, St. <br />Paul, Minnesota 55112, pg. 954, pg 960 <br />~~~., ,. . <br />