Publisher's Synopsis
Excerpt from River Surveys and Profiles Made During 1903
In order to determine the location Of the undeveloped water powers on the various rivers in the United States the United States Geological Survey has from time to time made surveys and profiles of the more important Of the rivers on which possible power sites were known to be located. The Object Of these surveys is to point out localities where power may be developed.
In the determination Of the river profiles the general plan Of survey adopted was as follows: The elevations were based upon reliable heights derived from primary or precise levels Of the United States Geological Survey. On this datum, with few exceptions, lines of ?ying levels were car ried up the bank Of each stream and bench marks were established at intervals Of about 1 mile, usually on nails on tree roots. The elevations Of the surface Of the water at the head and foot Of each shoal, rapid, or fall were noted. These levels, with few exceptions, have been tied at both ends. In the case Of Broad River primary levels were used instead Of flying levels, and regulation bronze tab lets left at intervals Of 6 miles.
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