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Last modified
1/26/2010 12:47:43 PM
Creation date
10/11/2006 11:26:45 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8443
Description
Narrows Unit
State
CO
Basin
South Platte
Water Division
1
Date
1/1/1978
Author
US BoR
Title
Report on Review of Certain Safety Aspects of Feasibility Stage Design of Proposed Narrows Dam Colorado
Water Supply Pro - Doc Type
Report/Study
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<br />(.4,........ <br />I .)~ <br /> <br />c. Right Abutment - No Clltoff Reach. <br />4. GrolIDd Water and Seepage Analysis. <br />5. Construction Materials. <br />6. Embankment Design. <br />a. Left Abutment and Riverbed. <br />b. Right Abutment - Slurry Trench Reach. <br />c. Right Abutment - No Cutoff Reach. <br />d. Right Abutment - Supplementary Dike. <br /> <br />The following discussion is intended to summarize our views on the foregoing <br /> <br />items: <br /> <br />1. Hydrology. The drainage area tributary to the Narrows site totals <br />13,270 sq. mi. It is complex and incorporates weather conditions of great extremes, <br />from the alpine region of the high Rocky Mountains to the semi-arid region of the Great <br />Plains. The average annual runoff at the site is only 422,000 ai., but it varies widely <br />from a minimum of 116, 000 ~ to a maximum of 1,355,000 ai. <br />These quantities are of particular significance in comparison with storage space <br />to be provided by the reservoir. Briefly, that space may be summarized as follows: <br /> <br />Item Elev ., ft. Volume. ai. <br />Conservation Pool 373,000 <br /> 4399.0 <br />Joint Use, Flood Control and 75,000 <br />Conserv. 4404.3 <br />Flood Control Space 475,000 <br /> 4428.5 <br />Super Flood Space 636,000 <br /> 4448.5 <br /> <br />Accordingly, it is shown that for an average runoff year, even assuming zero <br />releases through the dam, the complete runoff of the river could be stored well below <br />the top of the normal Flood Control Space, Elev. 4428.5. The possible significance of <br />this condition in relation to seepage under the long reach of the dam on the right abut- <br />ment will be considered lIDder a subsequent section. <br />Hydrologic records show that the South Platte River e.'qJeriences large flood <br /> <br />8. <br />
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