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FLOOD09852
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Last modified
1/26/2010 10:10:51 AM
Creation date
10/5/2006 4:42:05 AM
Metadata
Fields
Template:
Floodplain Documents
County
Alamosa
Community
Alamosa
Stream Name
Rio Grande River
Basin
Rio Grande
Title
Report on Governor's Emergency Funding 1987 Rio Grande Flooding
Date
7/15/1987
Prepared For
State of Colorado
Prepared By
CWCB
Floodplain - Doc Type
Flood Documentation Report
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<br />.... ' <br /> <br />I. <br />~ <br /> <br /> <br />LO <br /> <br />PURPOSE <br /> <br />During the Spring of 1987, the San Luis Valley was predicted to <br />receive high flood waters. An effort to divert flood water from <br />the Rio Grande above the communities of Monte Vista and Alamosa <br />was undertaken by local government and private interests. This <br />report will evaluate the use of irrigation ditches for flood <br />control in the San Luis Valley. <br /> <br />2,0 REPORT AREA <br /> <br />I <br />'".," <br />, ' <br /> <br /> <br />-~ <br />I <br />f <br />t <br /> <br />The report area is comprised of both Alamosa and Rio Grande <br />Counties in the San Luis Valley. The area is bounded on the west <br />and north by the Continental Divide, on the east by the Sangre <br />de Cristo Range, and on the south by the borders of Rio Grande <br />and Alamosa Counties. The Valley floor is nearly flat, sloping <br />from about four to ten feet to the mile, The northern part of <br />the Valley lies within a closed basin with no surface drainage <br />outlet, This basin is separated from the Rio Grande drainage by <br />a low lying ridge several miles wide. <br /> <br />Over one third of the land in the study area is <br />owned. It includes national forests, public domain, <br />refuges and the Great Sand Dunes National Monument, <br /> <br />federally <br />wildlife <br /> <br />The frost-free season in the Valley ranges from about 90 to 115 <br />days, Precipitation averages about seven inches a year. <br />Generally, soils of the Valley are coarse textured next to the <br />mountains and are a little finer textured toward the center of <br />the Valley. They are underlain mostly with sand and gravel at <br />depths of one to four feet. During good water years, <br />appreciable acreage along the west side of the valley is <br />completely or partially sUbirrigated, <br /> <br /> <br />The main irrigated crops are alfalfa, potatoes, barley, oats, <br />grass, hay, and pasture. Native hay or pasture on high water <br />table areas are an important part of many farms and ranches. <br />Crop yields are generally high and quality of adapted crops <br />unusually good, <br /> <br />2,1 HISTORY <br /> <br />The settlement at San Luis, the oldest town in Colorado, led to <br />the construction of ditches and the oldest court decree for <br />irrigation (April 10, 1852) in Colorado, By 1900 some 1,800 <br />miles of canals and ditches had been constructed. A large <br />network of irrigation canals was built during 1880-1890 to <br />irrigated lands in the eastern and central parts of the closed <br />basin, By 1915 most of the area around Mosca and Hooper became <br />waterlogged because of this irrigation. <br /> <br />t <br /> <br />Drainage systems <br />waterlogged lands <br /> <br />constructed <br />alleviated <br /> <br />between <br />some of <br /> <br />1911 <br />the <br /> <br />and 1921 <br />problems <br /> <br />to <br />but <br /> <br />reclaim <br />created <br />
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