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<br /> <br />J <br />I <br />I <br />I <br />I <br /> <br />Mr. Bill Stanton <br />November I, 1978 <br />Page 2 <br /> <br />b) As discussed at the meeting, a decision must be made on how the <br />100 year floodplain is to be illustrated within Montrose; <br />whether flooding extent should be shown entirely as pr'esented <br />at the meeting; whether a note should indicate extent; or <br />whether the mapping presented should cover only a limited area, <br />leaving full illustrated extent for the proposed city drainage <br />study. This decision must be made for both the 100 year and 5 <br />year floodplain mapping. <br /> <br />c) A means of different i at i ng on the mappi ng between shallow, <br />hydraulically disconnected flow and main stem flow would be <br />beneficial to future users of the report. We recommend showing <br />the 100 year floodplain boundar'ies as defined by the backwater <br />analysis as a dashed line within the areas subject to overflow. <br />In this manner, if grading or culvert replacement chanqes the <br />overflow pattern, the backwater defined 100 year floodplain <br />downstream wi 11 be shown, faci 1 itat i ng over'fl ow poundary rede- <br />finition. Also, extent of hydrall1ically disconnected flow in <br />relation to main stem flow would be apparent. <br /> <br />If you have questions regarding this information, p'lease call. <br /> <br />r <br />r <br />r <br />r <br />r <br />r <br /> <br />i <br /> <br />r <br />r <br />, <br />, ' <br /> <br />Sincerely, <br /> <br />HYDR,~"TRIAD, LTD~ ,'_ <br />.'I~y1'..M:- -- --I"') -, <br />~/,~ta . / <br />Wi 11 i am B. Mathews <br />Water Resource Engineer <br /> <br />WBM/gm <br /> <br />cc: Larry Lang <br />Mi ke Serra <br /> <br />Enc1: plan and profiles - Dry Cedar Creek <br />plan and profile data - Montrose ,Q.rr'oyo <br />crossing rating forms - Dry Cedar Creek <br />