PLANNING FOR RIVER TRAINING MEASURES
The
training measures are planned with due regard to the limitations imposed by the
type of river. The various steps involved are as follows:
1.
Alignment.
Alignment of training work is
generally based on the layout and number of training structures
involved. A better way to arrive at radius of curve is to study to photographs
of alignment of a stable stretch of river on a similar grade and soil
conditions in the vicinity of the erosion site and from this stable section
measure the radius of curves. An attempt is the made to develop an alignment
with curves of similar radius to those measured. Once the proposed alignment is
decided, the methods of control to stabiles the channel to its alignment are
considered.
2.
Cross
section. The cross
section is that built by the river itself, i.e., when the channel is uniform
and does not show signs of accretion of retrogression. The proposed section
is either by river contraction or by river diversion and is compared with the
normal cross section with regard to gauge and discharge relation, velocity of
flow, and total sediment runoff. The section is modified by successive analysis
to bring it in line with the normal corss section as far as possible.
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