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13000000095 Santa Maria Dam Inundation Report
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13000000095 Santa Maria Dam Inundation Report
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Last modified
2/5/2014 12:21:02 PM
Creation date
2/5/2014 12:21:02 PM
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Loan Projects
Contract/PO #
13000000095
Contractor Name
Santa Maria Reservior Company
Contract Type
Grant
Water District
20
County
Hinsdale
Mineral
Loan Projects - Doc Type
Report
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<br />SANTA MARIA DAM - 6 - July 11, 2013 <br />INUNDATION MAPPING REPORT <br />As the flood wave enters the outskirts of the Town of Creede it will overtop Highway 149 again, <br />and it will then flow east and inundate several structures which appear to be mostly residential. The <br />peak channel velocity through the Creede outskirts will be about 30 feet per second, and the <br />maximum flow depth will exceed 60 feet in the Rio Grande channel. The Creede town center is <br />more than 1.5 miles north of the Rio Grande – no flooding of this area is expected. <br /> <br />As the flood wave leaves Creede it will overtop Highway 149 again before flowing southeast to <br />parallel the highway for about 18 miles down a narrow canyon. The full width of the canyon is <br />expected to be inundated all the way down to the Town of South Fork along with the several <br />bridges and buildings inside the canyon. Nearly the entire length of Highway 149 will be <br />overtopped in this reach as well. The peak channel velocity through this canyon is expected to <br />reach 32 feet per second, and maximum channel depths will range from 23 to 61 feet. <br /> <br />The flood wave will overtop the Highway 149 bridge as it enters the Town of South Fork, and it <br />will then flow east through the town and subsequently through the community of Alpine. Several <br />structures in this reach will be inundated. U.S. Highway 160, which parallels the Rio Grande from <br />South Fork all the way to the City of Alamosa, will be inundated in multiple locations throughout <br />South Fork and Alpine. The maximum channel flow depth in this reach is expected be about 44 <br />feet, and the peak channel velocity will be about 24 feet per second. <br /> <br />After leaving South Fork and Alpine the flood wave will flow through a sparsely populated 13- <br />mile-long stretch before entering the Town of Del Norte. Several structures that appear to be <br />mostly homes and farm buildings are expected to be inundated in this reach. Rio Grande County <br />Roads 17 and 18, which are the two major crossings of the Rio Grande in this reach, are expected to <br />be overtopped. Maximum flood depths in the overbank areas are expected to range from 1 foot to <br />over 10 feet, and the maximum depth in the vicinity of the main channel will be about 30 feet. The <br />peak overbank velocity in this reach is expected to be approximately 16 feet per second. <br /> <br />The flood peak will have attenuated to a discharge of 75,200 cfs when it arrives at the Town of Del <br />Norte. Del Norte is expected to experience overbank flooding depths of over 10 feet and peak <br />velocities of about 3 feet per second on the south overbank. Flooding in the Rio Grande main <br />channel will be about 15 feet deep, and the peak channel velocity will be about 7 feet per second. <br />Numerous structures in town as well as the Oak Street / Highway 112 bridge over the Rio Grande <br />will be overtopped. U.S. Highway 160 is expected to be overtopped in Del Norte as well. <br /> <br />For the next 14 miles downstream from Del Norte the Rio Grande flows through another sparsely <br />populated floodplain. Several homes, farm buildings, and small private bridges in this reach are <br />expected to be inundated by the flood peak, and the two major crossings of the Rio Grande are <br />expected to be overtopped: Rio Grande County Roads 5N and 3W. Flooding depths will be greatest <br />in the Rio Grande main channel, in any secondary channels parallel to the Rio Grande, and in the <br />vicinity of County Road 5N. Overbank flooding depths in the reach upstream of County Road 5N <br />are expected to range from 1 to 7 feet, and overbank velocities will range from 1 to 4 feet per <br />second. Downstream of County Road 5N the floodplain will begin to widen, and overbank depths <br />will mostly be 4 feet or less. Overbank velocities in this reach are expected to range from 1 to 5 <br />feet per second. Overbank flooding near County Road 5N will range from 7 to 10 feet in depth, and <br />the peak overbank velocity will be approximately 5 feet per second.
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