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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an iterative process, adjustments are then made until the equation is

satisfied.
After calculation of the flow at a critical section by this method,

the computer will attempt to carryon the solution by energy balance

between stations, reverting back to this method when a balance cannot

be attained. This computation scheme limits application of the program

to the Cl, Sl, Ml, C2 and M2 profiles, or those flow profiles outside

of the range of sustained rapid flow.
In order to make a program useful as a tool for modeling changes
to a stream, maximum ease in supplying input and utilizing output
should be provided. TO accomplish this, all input data are entered on
four types of cards. The first type is for identification of the
stream and for specifying increments of elevation for sectional

hydraulic properties, station number of the first cross-section,

desired accuracy in solution of the energy balance, and limiting
Froude number for calculations; the second type specifies longitudinal

stationing and cross-sectional data; the third type provides roughness

data; and the fourth type specifies initial discharge conditions.

Two additional cards which are blank, except for a type code, specify
end of run and end of job. Cards for identification (Type 1) and
initial discharge conditions (Type 4) are required only at the start

of the program. Roughness cards (Type 3) are required at the start

and thereafter only where a change in the value of roughness occurs.

Output is provided in the form of a table of hydraulic properties,

followed by a tabulation of surface elevation, velocity, losses and
Froude number for each given discharge.