Progress Report Number 10 of Silt Load of Texas Streams: 1947-1948 Page: 2
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water samples for regular river flows ani extra samples during a flood
stage of a stream During the water year 1947-1948, 7,775 daily obser-
vations were made at 24 stations, and 11,062 water samples were received
and silt determinations made at our cooperative silt laboratory.
The Texas or Department of Agriculture silt sampler is not designed
or used for collecting water samples containing bed load material It is
used, however, for collecting water samples near the surface of a stream
for suspended silt material. This is the type of material that contributes
to most of the sediment deposited in the larger artificial lakes. The bed
load material contributes mostly to a river channel and upper portion of
a lake sedimentation0
All silt data compiled for this report have been computed for a
water year October 1 to the following September 30. This is a year adopted
by the Surface Water Branch, United States Geological Survey, in all of
their stream measurements. It is necessary and essential to use river dis-
charge data in connection with any silt determination of Texas streams, so
that period has also been adopted as a year for the silt calculations
The silt determinations are made by calculating the percentage of dry
silt by weight as obtained from a water sample
For the main purpose of the sedimentation studies of Texas streams
all calculations are based on one cubic foot of silt weighing 70 pounds.
SUMMARIZED SILT DATA
Belton Station, Leon River
The average discharge of the Leon River at the Belton Station for a
2-year record is 497,780 acre feet, while for the year 1947-1948, it was
122,140 acre feet, or 25`. of the average flow0 The average silt load for
the same period is 486 acre feet, while for 1947-1948, it was 77 acre feet,
or 16j. of the average load. The total load for a 3-year period is 1,611,940
tons or 1,089 acre feet of silt.
South Bend Stations Brazos River
The average discharge of the Brazos River at the South Bend Station
(upper portion of watershed) for a 5o7-year period is 497,400 acre feet,
while for the year 1947-1948, it was 391,140 acre feet, or 79j. of the aver-
age flow. The average silt load for the same period is 2,216 acre feet,
while for the year 1947-1948, it was 1,783 acre feet, or 801. of the aver-
age load The total load for the 6o7-year period was 22,007,940 tons, or
14,437 acre feet of silt.
Richmond Station, B3razos River
The average discharge of the Brazos River at the Richmond Station
(lower portion of the watershed) for a 2303-year period is 6,023,540 acre
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Bloodgood, Dean W. Progress Report Number 10 of Silt Load of Texas Streams: 1947-1948, report, August 1949; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1623153/m1/13/?rotate=0: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.