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<br />-,2- <br /> <br />The first modification that \~e propose is that an <br />automated flood warning device and s1:aff srage be at-tached to <br />the right downstream abutment at the Highway 52 bridge instead <br />of the county rQad crossing 1 mile downstream. There are no <br />apparent advantages to using the downstream site over the <br />Highway 52 site and there are many disadvantages. Reasons for <br />the proposed change include: <br /> <br />a. Land leveling in support of farming practices at <br />the county road crossing will cause changes in any rating curve <br />developed for thE! site over tim,,,,. Presently, the channel and <br />left bank have been disturbed to a depth of several feet. <br />Conversely, the highway 52 si-te has a more stable cross sec- <br />tion. <br /> <br />b. The alarm gage 'would have to be located off of <br />the right-of-way on the left downstream bank on private land <br />near the low road crossing. Phone lines would have to be <br />buried very deep to avoid bein':r cut by earth moving operations. <br />Additionally, those lines would probably have to be brought in <br />from 1/4 mile away at considerable expense. TherE~ is a phone <br />line at the Highway 52 bridge. <br /> <br />c. In order to build the stilling well gage at <br />low water crossing, a pile would have to be driven at the <br />and the gage attached to the dm,rnstream side. While the <br />will afford some protection to t:he gage from debris, it <br />wash out or be struck by large dElbris in a major flood. <br />Highway 52 bridge has survivE!d major floods and offers <br />protection for the stilling well. <br /> <br />the <br />site <br />pile <br />could <br />The <br />good <br /> <br />d. The Highway 52 bridge is as good as the site 1 <br />mile downstream in terms of road overflow. The overflow point <br />on Highway 52 is about 1/4 mile east of the bridge and overflow <br />may begin after the stream exceeds a stage of 2/3 to 3/4 <br />bankfull. The overflow point_ at the low road crossing 1 mile <br />downstream of Highway 52 occurs abou1: 1/4 mile west of that <br />crossing.- Additionally, overflows from Kiowa Creek :may enter <br />Jack Rabbit Creek several miles upstream and bypass both sites. <br />since overflows generally occur when s1:reams reach high stage, <br />the occurrence of overflows bypassing 1:he main channel will not <br />reduce the effec1:iveness of the flood detection system while <br />the stage is rising. <br />