Laserfiche WebLink
<br />accurately record the peak: stage or discharge, An abandoned stream gage on the North Fork, just <br />upstream of its confluence with the South Platte River, was discontinued approximately 15 years <br />ago, Therefore, no direct measurement was recorded on the North Fork, The highest recorded peak: <br />discharge on the discontinued gage was about 2.1 ()() cfs in 1949. <br /> <br />3. Hydraulic Summary <br />The channel geometries of Sand Draw, Spring Gulch, lower Buffalo Creek, and other tributaries <br />were significantly altered during the July 12 flood event. Streambanks were severely eroded, <br />streambeds either aggraded or were scoured, vegetation was removed, crossings were destroyed, <br />and low flow channels were laterally displaced, The post-flood hydraulic characteristics of the <br />affected stream reaches are significantly different than those prior to July 12, 1996. <br /> <br />Jefferson County performed hydraulic analyses, particularly on Sand Draw, to estimate the "safe" <br />channel conveyance in the lower reach through the community, The hydraulic analyses were based <br />on surveyed slopes and cross-sections of the post-flood channel conditions. A discharge of 2,000 <br />cfs was determined to be the maximum discharge that would likely not cause major damage to <br />Highway 126 and adjacent homes and outbuildings, The County also used the hydraulic analyses to <br />design several roadway crossings that serve residential areas to the south and west of Highway 126 <br />along Sand Draw, <br /> <br />7 <br />