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<br />I <br /> <br />.. ' <br /> <br />, <br />~1 <br />~. <br /> <br />1 <br /> <br />Felix L. Sparj<s <br />February 8, Ip77 <br />Page 'two <br /> <br />cross-section durin~ and after ~ravel eperations <br />that'could handle a 100 year floed, and (3) effects <br />of straightening the River during localized gravel <br />operi'tions. <br />, <br />, <br /> <br />2. Bridpes <br /> <br />There are a number of county bridges across the <br />Poudre River which require replacement. The County <br />Department of Engineering desires technical informa- <br />tion regarding such replacement, not only to provide <br />for vehicular safety and for minimal interference <br />with floodwater passage, but to reasonably assure <br />that floodwaters are not displaced by newly censtructed <br />bridges onto lands which would otherwise be unaffected <br />by ~looding. Information desired should be sufficient <br />to determine waterway openings, approaches, how the <br />100'year floodplain would be affected, and provide for <br />channelization recommendations, for such bridges. <br />, <br /> <br />i <br /> <br />3. Tr.ibutaries <br /> <br />.;....... <br /> <br />Dev~lopment along tributary streams affects rivers <br />thrQugh increased runoff. Technical information <br />reg~rding how'huch and what to do about it, is, <br />another subject of concern. It is desired that the <br />study examine selected sample drainages for the effects <br />of i,ncreased runoff on the niver, as. well as on the <br />tributary, and suggest methods to 'alleviate adverse <br />imp~cts. Examples include: subdivision detention, <br />larl:{e scale detention, storm sewer, and channelization. <br />Cur~ently, the County requires retention ponds in all <br />new~subdivisions to collect excess runoffs. Is this <br />requirement effective? Unnecessary? Should other <br />alternatives be considered? Weld Countv desires <br />inf9rmation on this subject on both Sheep's Draw which <br />is ~ well defined and relatively undeveloped tributary <br />in preeley's growth area, and on the undefined drainage <br />system around the Windsor growth area. ' Hopefully, <br />these two drainage areas can serve as models for other <br />drainages in the Poudre Basin. For example, what should <br />Windsor (and other similar areas) do with runoff, given <br />no definable floodwater channels? <br />, <br /> <br />, <br />l~ <br /> <br />.j <br /> <br />~ <br /> <br />i <br /> <br />]'"" <br />