FLOOD09224

• County: Statewide
• Basin: Statewide
• Title: Steep Channel Water Surface Profiles
• Date: 7/1/1971
• Prepared By: CSU
• Floodplain - Doc Type: Educational/Technical/Reference Information

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a consideration of the form losses: this calculation only applies to

situations where a bridge is not submerged. Besides the ease in

changing roughness data by a factor, this program offers great

flexibility for changing cross-sectional shape, since cross-sectional

stations may be freely added or deleted wherever it is necessary. Data

entry is reasonably direct, but volume of printout is excessively high,

although easily interpreted.
The USCE program, in addition to being able to provide most of

the information available from the USBR program, can calculate flow

around levees, carry out vertical-faced encroachments onto the stream

and accomodate bend losses. Channel bends are accomodated by station-

ing entries for the main channel and for each overbank. The USCE

program appears to be particularly well adapted to profile calculations
in sinuous channels of low hydraulic gradient. Its use, however, is

extremely cumbersome since statement cards for the Fortran deck alone

weigh in excess of forty pounds. The program has been designed to run

on a CDC 6600 computer and has not been modified to date for compila-
tion by the CDC 6400.
Of the two programs developed by individuals, the compact program

of Gary L. Lewis appears to offer some prospect of versatility if its

use can be extended to cover irregular channels. His present program

is easy to work, but only accommodates one of three types of prismatic

channels in anyone run.

The program by James H. Duke, Jr., is probably the most direct

program available for computing a series of flow profiles for different

values of discharge. However, it has two distinct disadvantages. It

is necessary to construct curves for solution of the backwater profile;

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