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Last modified
1/26/2010 12:13:37 PM
Creation date
10/11/2006 9:37:39 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8407.700
Description
Platte River Basin - River Basin General Publications - Republican General Publications
State
CO
Basin
South Platte
Water Division
1
Date
4/29/1954
Author
BOR
Title
Bonny Dam - Technical Record of Design and Construction
Water Supply Pro - Doc Type
Report/Study
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<br />~,-.,.~.;'I. <br />Ii.ld~'/lli ' <br />OO!too ' <br /> <br />CHAPTER I1--INVESTIGATIONS <br /> <br />11. General. - Early investigations by the Bureau of Reclamation for the Bonny <br />Dam site were included in a reconnaissance survey of the entire Republican River basin <br />in 1939. More detailed investigations of the entire St. Francis unit were initiated in <br />1941. This work was discontinued during World War II and later resumed in 1945. <br /> <br />~ <br /> <br />Investigations by the Bureau included work at two dam sites on the South Fork <br />of the Republican River, and at four dam sites on tributary streams. Figure 3 shows <br />these sites; the tributary sites were designated Sand Creek, Nameless Creek No. I. <br />Nameless Creek No.2, and Landsman Creek. The rapid decrease in streamflow up- <br />stream and the decrease in irrigable land downstream from these locations precluded <br />further investigations for sites. An evaluation of the various dam locations reduced the <br />number for final consideration to the two principal sites; namely, Bonny Dam No.1 and <br />Bonny Dam No.2, which were so designated to distinguish them from the Hale site pre- <br />viously considered by the Corps of Engineers. Consideration was given to the irrigable <br />lands available, economy of conveying the storage water, and length of distribution <br />system. <br /> <br />Land classification results indicated that the high tablelands above St. Francis <br />were well situated for gravity irrigation, so the Bonny sites were considered to be stra- <br />tegically located. Construction of a dam at Bonny site No. 1 was estimated to be more <br />economical than at Bonny site No.2, so the former was selected for the location of the <br />dam. Bonny site No.1 is situated about 1-1/2 miles downstream from Bonny site No.2. <br /> <br />Chemically, the soil of this region is like the soil of most semiarid regions in <br />that it is slightly alkaline. The deposition of nearly all of the material found near the <br />surface has been by wind action; the small amount of precipitation has not caused any <br />noticeable degree of leaching action. The ground water of the region has accumulated <br />entirely from precipitation percolating from the surface down to the zone of saturation, <br />or watertable. This water passes through beds of material composed mainly of highly <br />insoluble quartz and feldspar grains. From these grains, a small amount of salts, con- <br />sisting mainly of calcium and magnesium carbonates. is dissolved. Ground water of the <br />Republican River valley usually carries a fairly high mineral content, but this is true <br />only farther downstream where it comes in contact with the underlying Cretaceous beds. <br /> <br />Based on examinations to date it was concluded in 1948 that: <br /> <br />(1) Sufficient suitable earth material for construction of the dam was available <br />within an average haul distance of about 5,000 feet. <br /> <br />(2) Pervious sand was available from the river bars, Sand Creek. or Hale <br />Wash within a haul distance of 6-1/2 miles. <br /> <br />(3) Local pozzolan material was considered unsatisfactory for use until it was <br />processed. Test results indicated that fly ash from Chicago, Ill. I was a suitable <br />pozzolanic material and produced satisfactory strength when used in concrete. Re- <br />search indicated that the fly ash would reduce the alkali reactivity of the aggregate. <br /> <br />(4) RiI....er sand from near the site of the dam was suitable for use as concrete <br />aggregate, provided low-alkali cement was used. <br /> <br />" <br /> <br />(5) Suitable coarse aggregate was not available locally. The most economical <br />source of coarse aggregate was the Clear Cr~ek gravel deposit near Denver, Colo. <br /> <br />(6) There apparently would be very little difference in the cost of rock for rip- <br />rap. whether obtained from Herndon and/or Ludell, Kans., or Golden, Colo. The <br />latter rock occurs in greater quantity and is more uniform and of better quality. <br /> <br />These conclusions are further discussed in sections 13, 14, and 15. <br /> <br />11 <br />
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