WATER PROJECTS AND WATERSHED TREATMENT
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Date
1968
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UNIVERSITY OF AGRICULTURAL SCIENCES, BANGALORE
Abstract
A presumptive approach was used to analyze the effect of
land~nag~ent-caused alteration of hydrology on the output
of water conservation projects. Two basic kinds of hydrologic
reaction to land treatment were assumed: a constant factor
flow increase for all months of the year, and a 1/2 month delay
in the annual hydrograph. These alterations were applied singly
and in combination to a series of computer-generated reservoir
inflows, and storage-yield relationships determined qy the sequent
peak method, both for the altered {treated) and unaltered (virgin)
inflows. The difference between the yields at various storages
was determined by subtraction, and attributed to the differences
in inflows, or the alterations.
Results showed that not all increases in flow were of value
to the water project in terms of increased yield. A constant
factor increase gained utility with increasing storage. A timing
delay had very little effect on yield at very small and very large
storages, but was of maximum effectiveness at intermediate storages.
A.p~mbination effect, i.e., flow increases and timing delays,
affected the yield curve in an approximately additive fashion, combining
the two separate treatments nearly linearly. The method
used appears viable and applicable to other investigations of hydrology
alterations on downstream uses
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No. Of references 48