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Merrill Creek Crossing <br />The southerly access to the Viking Site from Hardeson Road will cross Merrill Creek. <br />I The crossing had been designed using precast, prestressed, hollow-core concrete slabs <br />(per Concrete Teclu�ology, Inc., or equivalent). The bottom of the crossing has been set <br />I to be over 1 foot above the 100-year water surface elevation of 506.58 (see plans for this <br />elevation and �ee the Hydraulic Elements output in the Appendix for supporting <br />cal�ulations). <br />A flow of 200 cfs was used to determine the ]00-year water surface elevation. This flow <br />was used after comparing it with the flow (190 cfs) provided by the City (which came <br />from the City's {see Dan Mathius} model of the regional basin for the developed <br />condition) and the flow (200 cfs) described in the report titled "Summary of Hydraulic <br />Analysis for Merrill and Ring Creek". by Klohn Leonoff, December 4, 1990 (see <br />Appendix). <br />The flow that will pass under the crossing at 1 foot of freeboard (D = 2.82) is 280 cfs. <br />The flow that will pass under the crossing at no freeboard (D = 3.82) is 439 cfs. See the <br />Hydraulic Elements output in the Appendix for supporting calculations. <br />� <br />ISTORM DRAINAGE REPORT FOR VIKING -I�RRILL CREEK PAGE 10 <br />