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» V <br />1.6 Acres <br />176.3 Acres <br />109.3 Acres <br />16.9 Acres <br />304.1 Acres <br />f' ■ <br />■ 'v ... ■ <br />s* <br />'i <br />■iifc' <br />1 <br />\vw <br />’ ■> •■tr ’ <br />w * <br />ENGINEERING COMPANY □ 2815 WAYZATA BLVD. □ MINNEAPOLIS. MN. 55405 □ (612)374-4740 <br />C. FRANKOSICV JR. <br />LI M. act <br />«• Vict RtsudfAl <br />IBRAUCMER <br />.CS i. HANSEN <br />LARRY C. McMURTRY <br />TreMurff <br />iRUCC R KELLIY <br />Aitocisit <br />DAVID N McENARY <br />Atiocistt <br />tesLie G. benschl 6« <br />Ataocislt <br />•• • •• V <br />• • ^ <br />iLr:\ '-r.■^4 <br />April 11, 1977 <br />fr^r <br />i <br />>* W <br />Minnehaha Creek Water Shed District <br />Eugene A. Hickok & Associates <br />Mr. John Holmquist <br />545 Indian Mound <br />Wayzata, MN 55391 <br />Gentlemen: <br />The following is our report to you regarding the drainage study for West Campus <br />Suburban Hennepin County Area Vocational Technical School (Independent School <br />District 287). The bridge, which will be used for agricultural equipment, is <br />needed to connect neighboring fields separated by a creek. This would permit <br />sh^^^rFigure'Sne!^^ con^r^Lf beei^xpressed^^ thrMinne^ha^'^reek Water <br />Shed District as to the possibility of the bridge being inundated by a design <br />storm. This study is to determine the maximum height and width the creek will <br />rise at the proposed bridge site for the bridge during a potential 100 year <br />storm. <br />The report is divided into two (2) areas of study. The first is the determi­ <br />nation of the peak rate of flow in the design storm by the proposed bridge <br />site. The second area of study is the determination of the maximum height <br />and width the water in the creek will rise at the peak rate of flow. <br />DETERMINATION OF THE PEAK RATE OF FLOW <br />The Rational Method was used to find the peak rate of flow during a potential <br />100 year storm. This method calls for the drainage area to be broken down into <br />the different types of runoff based on its imperviousness. The imperviousness,which <br />is the maximum rate of runoff compared to the average range of rainfall, was base <br />on the future development expected in the drainage area. The City of Orono has zoned <br />CONSULTING ENGINEERS <br />jsanaucTURAL^jmL <br />400 SIBLEY <br />ST. PAUL. MN. 55101 <br />310 SOUTH LINCOLN STREET <br />ABERDEEN. S.D. 57401 <br />it • <br />April 11, 1977 <br />Page 2 <br />£i2EFMINATI0N0F THE <br />of the <br />lot sizes. They do i <br />rural agricultural U <br />"oonepln Coun <br />fully developed. <br />Please see Figure Tw< <br />was found with the ui <br />and by on-site inspec <br />lo the lack of a <br />holding pond located <br />tlon described hereii <br />found to be 178 cubic <br />determina tion of thp ^ <br />S.S”r;; « <br />potential d <br />and roughness of the c <br />Jhe capacity of the 4; <br />strea. of the proposec <br />oesign storm. <br />nummary Awn <br />ue to the type of brl <br />5’ “Pinion that <br />At thf**\“i« location the di <br />a base of the creek bed <br />which are capable of ha