A nondimensional form of the basic differential
equation for spatially varied flow with increasing
discharge was developed in section VI. The main
purpose of this thesis is the application of this
nondimensional equation to rectangular channels of
various roughness values.
A rectangular channel with continuous flow was
constructed in order to establish uniform flow. The
channel roughness was altered by placing screen wire
and wooden cubes in the channel. Manning roughness
coefficients were determined from the observed
values for uniform depth.
The law of conservation of linear momentum was
used to develop a differential equation for spatially
varied flow with increasing discharge. By defining
certain dimensionless parameters, this equation was
altered to a dimensionless form. An IBM 7040
computer was used to solve this nondimensional equation
for various conditions of slope, roughness,
and discharge. When the channel slope and roughness
were held constant, the theoretical profiles varied
slightly over a wide range of discharge.
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