Therefore, the first scenario was selected for trapezoidal weir, while the second one was employed for rectangular weir
Rehbock  purposed the flowing equation based on experimental data for estimating discharge coefficient of the rectangular weir with wide equal to channel.
Razavian and Heydarpour  studied on the combined flow characteristics over rectangular weir - gate with unequal contractions.
11 What is the flow in a channel if a contracted rectangular weir
with a 1-m crest length is placed in the channel and has a head of 0.
A variety of built-in flumes and weirs for determining flow rates including Parshall flumes, cut-throat flumes, California-pipe weirs, rectangular weirs
and v-notch weirs.
Long rectangular weirs
are too sensitive; slight differences in head can create significant imbalance.
The distribution box contains two rectangular weirs
of unequal length set at the same elevation.