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;- <br />..r . <br />NE1f CABTLE ENERGY <br />William P. Van Liew, P.E. <br />12/19/90 <br />. r~i -tr-iilr-iii-ii <br />8valuation o! SMALL Diameter Pipe Potentially Re9trictiaq <br />Area For 81ov 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 />_.- ~~ ~ <br />Diameter of Area o! Perceatage o! Culvert <br />Culvert Culvert Area Taken IIP by 8ma11 <br />(in.l (ft2) Piae <br />12; 0.785 3.9$ <br />18 ~ 1.767 1.7$ <br />24 3.142 1.0$ <br />30" y. ~ r D, ~3.°~ <br />36 7.069 0.4$ <br />42 9.521 0.3$ <br />'Reference: Driscoll, Fletcher G., 1986, Groundwater and <br />Wells, Second Edition, Johnson Division, St. <br />Paul, Minnesota 55112, pq. 954, pg 960 <br /> <br />