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America's Renewable Resources: Historical Trends and Current Challenges

By: Kenneth D. Frederick; Roger A. Sedjo | Book details

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Page 72
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Appendix 2

Table 2-A1. Estimated Water Use in the United States, 1900-1958
Purpose Water use (billions of gallons per day)
1900 1910 1920 1930 1940 1945 1950 1958
Irrigationa 20.2 39.0 55.9 60.2 71.0 83.1 100.0 127.5
Public supply 3.0 4.7 6.0 8.0 10.1 12.0 14.1 19.7
Rural domestic and livestock 2.0 2.2 2.4 2.9 3.1 3.1 4.6 5.8
Other industrialb 10.0 14.0 18.0 21.0 29.0 41.0 38.1 56.4
Thermoelectric power 5.0 6.5 9.2 18.4 23.2 31.2 45.9 89.9
Total offstream water use 40.2 66.4 91.5 110.5 136.4 170.4 202.7 299.3
Source of water
Ground 7.3 11.7 15.8 18.2 22.6 28.3 35.2 54.0
Surface 32.9 54.7 75.7 92.3 113.8 142.2 167.5 245.3
Source: Picton ( 1960).
aTotal withdrawals including delivery losses.		bManufacturing and mineral industries, rural commercial,air conditioning,
resorts, hotels, military and other state and federal agencies, and other mis-
cellaneous uses.

Table 2-A2. Dams Completed in the United States, 1700-1982
Average increases Cumulative total by
end of period
Period Number
of dams		 Storage
capacity of dams
(maf)		 Dams per year Storage
capacity per dam
(1,000 acre-feet)		 Dams Storage capacity
Dams (maf)
1700-1899 2,661 10 -- 4 2,661 10
1900-1920 4,734 43 225 9 7,395 52
1921-1932 2,786 81 232 29 10,181 133
1933-1944 5,135 146 428 28 15,316 279
1945-1969 35,273 474 1,411 13 50,589 753
1970-1982a 12,830 117 1,069 9 63,419 869
Source: U.S. Army Corps of Engineers ( 1982).
Note: Table represents only dams at least 6 feet high with at least 25 acre-
feet of storage, or at least 25 feet in height with at least 15 acre-feet of
storage. Rows may not add because of rounding.		aThe 1982 numbers include only one dam with a storage of 85 acre-feet.
Consequently, the annual averages for the 1970-1982 period are based on
12 years.

Table 2-A3. Major Purposes of Dams Constructed, Before 1900 to 1982
Major purpose of dams
(percentage of total)
Period Total number
of dams constructed		 Irrigation Hydroelectric Flood
control		 Water
Supply		 Recreationa Navigation Stock
or farm pond
Before 1900 2,661 11 5 2 19 48 1 3
1900-1920 4,734 25 9 2 18 35 1 3
1921-1932 2,786 16 11 2 20 40b 6
1933-1944 5,135 12 3 3 17 37 1 21
1945-1969 35,273 9 1 18 11 34 ___b 20
1970-1982 12,830 8 __b 22 6 30 __b 22
Total 1700-1982 63,419 11 2 15 12 35 __b 18
Source: U.S. Army Corps of Engineers ( 1982).
Note: Table includes only dams at least 6 feet high with at least 25 acre-
feet of storage, or at least 25 feet high with at least 15 acre-feet of storage.		aThe relative importance recreational of dams is overstated by the per-
centages of dams because most of these dams are relatively small.
bDenotes less than 0.5 percent.

-72-

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