STREAMFLOW ROUTING - Hydrology: An Introduction - page 241

In (7.57), V ipr is the flow velocity at the peak of the flood event on record at the inflow end
of the reach. In a similar way, one obtains from Equation (7.54) the adjusted weighting
parameter

1
2 + ( X r − 0 . 5) h ipd / h ipr

X d = (7.58)

where h ipr is the peak water depth at the inflow section of the reach, measured or calculated
for the reference flood event used in the calibration, and h ipd is the corresponding peak water
depth at the entrance section for the flood event for which the parameter X d is sought; values
of a are listed in Table 5.2. With the more accurate expression (7.56) and (5.63) one obtains
in a similar way

2 + ( X r − 0 . 5) gh ipd − a 2 V ipd

1

X d = (7.59)

gh ipr − a 2 V ipr

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