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FLOOD07093
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Last modified
1/29/2010 10:12:00 AM
Creation date
10/5/2006 2:44:09 AM
Metadata
Fields
Template:
Floodplain Documents
County
Otero
Pueblo
Community
Otero, Pueblo Counties
Stream Name
Arkansas River
Basin
Arkansas
Title
Arkansas River Channel Capacity and Riparian Habitat Planning Study
Date
8/1/2001
Prepared For
CWCB
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Project
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<br />those for agricultural irrigation diversion to their canal delivery systems, to off-channel <br />reservoirs, or to John Martin Reservoir (US ACE 1997b:2/1, 3/1; USGS 1998; Mueller et al. <br />1991:8, Figures 1 & 2; Milenski 1990:131-133). Similarly, flows that originate in the Purgatoire <br />River basin above the Corps' Trinidad Lake Project may be temporarily stored at Trinidad Lake <br />for subsequent delivery to specific downstream irrigation users or to John Martin Reservoir. The <br />Purgatoire River flows do not affect the study area with the exception of Channel Problem Area <br />No.3 at the confluence of the Purgatoire River with the Arkansas River. However, flows that <br />derive from the other tributaries such as Timpas, Horse, and Adobe Creeks have affected and <br />continue to affect the Arkansas River channel (Sharps 1969; US ACE 1965:23, 1970:B27, B65- <br />B66, 1973:50-53, 1985:15; Nadler 1978:89,113,126; Nadler and Schumm 1981:104, 109, 113). <br /> <br />John Martin Reservoir supplies water to irrigation users as far downstream as Garden City, <br />Kansas. Current reservoir operations for conservation storage and release follow the plan <br />adopted by the Arkansas River Compact Administration in 1980, as amended. Releases for <br />irrigation and delivery normally are made between April 1 and October 31 of each year. Inflow <br />is stored in November through March except for releases required for flood control. Flood <br />control operations begin when John Martin Reservoir storage exceeds an elevation of 3,851 feet; <br />that is water temporarily stored above the elevation of the top of the conservation pool. The <br />current operational channel capacity of the Arkansas River is approximately 3,000 cubic feet per <br />second (cfs) at Coolidge, Kansas. Actual release from the dam may exceed 3,000 cfs when <br />flows are expected to diminish before reaching Coolidge due to irrigation withdrawal or transit <br />loss. <br /> <br />While some of the preceding information regarding John Martin Reservoir and water <br />releases from the dam is more specific to areas downstream, it is important to understand that the <br />administration of water according to the Compact's 1980 conservation storage plan not only has <br />significant effects on the amount of water stored at John Martin Reservoir but also affects the <br />timing of releases at John Martin Reservoir as well those at Pueblo Reservoir and Trinidad Lake <br />and the amount of water that flows through the Arkansas Valley and the study area, whether by <br />the river channel or via irrigation canal systems. Prior to the Compact's 1980 agreement, <br />irrigation users called for and used practically all of the stored irrigation water at John Martin <br />Reservoir during the irrigating season. As a result, there were many years where the irrigation <br />water supply was used prior to the end of the irrigating season and also many years when John <br />Martin Reservoir was completely dry for most of the year. The Compact's 1980 agreement <br />instituted a more conservation minded approach to water delivery and management. Since 1980, <br />water users call for water as necessary, and although'storage has been low during some years, <br />John Martin Reservoir has always had stored water. <br /> <br />Although the exact relationships between surface and ground water within and flowing <br />through the valley are not fully understood and are the subject of increasing study, concerns <br />regarding flood and related water resources problems such as increasing serious flood threat, <br />heavy plant growth, decreasing channel capacities, aggradation, and bank erosion were raised by <br />local citizens and officials at public hearings as far back as the 1940s and 1950s. Local officials <br />also voiced concerns about the potential for backwater flooding at Las Animas from flood water <br />storage at John Martin Reservoir, and some believed that storage at John Martin Reservoir was <br />affecting and thereby creating problems with high ground water in areas as far upstream as La <br /> <br />6 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />
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