Department Bulletin 1430 
PLATE II 
PHOTO BY THORNDYKE SAVILLE. N. C. GEOLOGICAL AND ECONOMIC SURVEY 
Removing Silt from Reservoir 
Fig. 1. — Reservoir on Deep River, N. C. Pondage so reduced by siltage that twice a year 
it is necessary to draw down the water to allow the silt to be removed in front of the wheel 
inlets 
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THORNDYKE SAVI 
N. C. GEOLOGICAL AND ECONOMIC SURVEY 
Pondage Destroyed by Siltage 
Fig. 2.— Looking downstream at Whitney Dam, above Badin, N. C, on Yadkin River. 
Water drawn off, exposing silt beds nearly filling the reservoir and exposing only the upper 
portion of the 38-foot high dam, constructed in 1910. The water below the dam is back water 
from new dam 180 feet high which floods the old 
HOW EROSION OF SOIL INCREASES THE COST OF POWER 
A reservoir which lasts only 25 years must be paid for within that time by the users of its power 
