PROJ00077

• Contract/PO #: FS0008X
• Contractor Name: Longmont, City of
• Contract Type: Loan
• Water District: 0
• County: Boulder
• Loan Projects - Doc Type: Feasibility Study

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January 22. Minimum concrete temperatures and temperatures on June 14, which
would be representative of the mean concrete temperature throughout the year, are
shown on Table III.
Loading Conditions
The Bureau of Reclamation (1977) recommends that arch dam designs should
be based on the most severe "usual" load combination which might be expected.
Combinations of transitory load, each of which have only a remote probability of
occurrence at any given time, have a negligible probability of simultaneous
occurrence and should not be considered as a reasonable basis for design. The
Bureau has defined three loading combinations which include "usual" loading,
"unusual" loading and "extreme" loading. 'Usual loading combinations are
described as follows:
1. Effects of minimum usual concrete temperature and the most probable
reservoir elevation occurring at that time with appropriate dead
load s.
2. Effects of maximum usual concrete temperature and the most probable
reservoir elevation occurring at that time with appropriate dead
load s.
3. Normal design reservoir elevation and the effects of usual concrete
temperature occurring at that time with appropriate dead loads.
4. Minimum design reservoir elevation and the effects of usual concrete
temperature occurring at that time with appropriate dead loads.
The loading condition which was selected to be representative of a
"usual" loading combination was a condition ,of normal water surface elevation at
the level of the spillway invert or elevation 10,978 feet combined with the
affect of the usual concrete temperature occurring at that time. Previous
hydrologic studies have indicated that the reservoir would be able to fill by
approximately mid June of each year and therefore June 14 temperatures were used
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