- By B = cote
A straight weedy-earth channel has the trapezoidal shape of
Fig. , with b= 4 m and θ = 35°. The channel has a constant
bottom slope of 0.001. The fl ow rate varies seasonally
from 5 up to 10 m3/s. It is desired to place a sharp-edged weir
across the channel so that the water depth 1 km upstream
remains at 2.0 m ± 10 percent throughout the year. Investigate
the possibility of accomplishing this with a full-width
weir; if successful, determine the proper weir height Y. If
unsuccessful, try other alternatives, such as (a) a full-width
broad-crested weir or (b) a weir with side contractions or
(c) a V-notch weir. Whatever your fi nal design, cite the
seasonal variation of normal depths and critical depths for
comparison with the desired year-round depth of 2 m.
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