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<br />'<(.1 <br />-:>;-; <br /> <br />Therefore, where flows leave the street"the street sections adopt an <br /> <br /> <br />effective width of approximately 180'/street. This section is rated <br /> <br /> <br />and a "per street" rat:Lng curve is developed encompassing portions of <br /> <br /> <br />the flow whose magnitudes are: A. 0-300 cfs/street B. >300cfs/street. <br /> <br />Determination of depth of flooding in watercourse 1000 is carried out <br /> <br /> <br />using the same techniques as for watercourse 1200. For the entire <br /> <br /> <br />we 1200, it is assumed that 4 streets and appurtenant flowage areas <br /> <br /> <br />convey the flow. <br /> <br />Flows to the area derive from Lake Minne'lua at Division Avenue. A flow <br /> <br /> <br />split takes place wherein 50% of flow is estimated to flow down we 1000. <br /> <br /> <br />This means the magni tuc:es are: <br /> <br />Q,500 = 9712 c fs <br />'l:L00 = 3355 cfs <br />Q,50 1572 c fs <br /> <br />'l:L0 <br /> <br />= <br /> <br />117 cfs <br /> <br />Spli t among the four flowage areas the "per street" Q,' s are: <br /> <br />2428 <br />839 <br />393 <br />30 <br /> <br /> <br />c fs per stre'et <br /> <br /> <br />By reading the "per street" rating curves for watercourse 1200, dep~hs <br /> <br /> <br />level throughout watercourse 1000 are determined to be: <br /> <br />of flow above street <br /> d500 = 2.6 ft <br /> dlOO = 1.6 ft <br /> d50 = 1.2 ft <br /> dlO = 0.3 ft <br /> <br />3 <br /> <br />.~r.' <br />:, .i. <br />. . <br />l: <br />" <br />r.~ <br /> <br />V <br />\,. <br />j..",- <br /> <br />-iI<"'- <br />