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The adjustment factor 1/S0vw (day/m) varies with water level. This factor is fitted by a parabolic function of h:
for h>hmin
Twin gauge station fall-discharge methods
Stage-fall-discharge or twin gauge station fall-discharge methods are user to include backwater effects on stage-discharge ratings.
In these methods the fall F between the water level at the discharge measuring site and a downstream station is considered as an additional parameter, to account for the effect of water surface slope on discharge. Both the constant fall method
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and normal fall method are based on the following equation:
Where:
Qm = backwater affected discahrge
Qr = reference discharge
Fm = measured fall
Fr = reference fall
p = power, with 0.4 < p < 0.6
constant fall method
In this method the reference fall Fr is taken as a constant. A special case of the constant-fall method is the unit-fall method, where Fr = 1m is applied. In the computational procedure a value for Fr is assumed. Then a rating curve is fitted to the values:
normal fall method
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add method here from hymos user manual! |
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