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

49

.

where C is a cross-sectional coefficient, A is area, H is depth
s
of flow, and m is a sectional discharge exponent. For the reach of

stream studied, the values used for

C
s
Computation proceeds in an upstream direction from

and

m were 2.46 and 0.50,

respectively.

control sections or, in the case of the first section, sections of

known uniform flow. Flow is assumed to be either subcritical or

i

critical, hence the sequence of calculations in an upstream direction.

i

Due to velocity checks in the program, it is not well adapted to

calculations of supercritical flow in a downstream direction from a

control section. The computational sequence is shown on the accompany-

ing flow chart.

Input
Input is provided on six types of cards. The cards are identified

.

by one digit in column 80 which corresponds to the card type. Types
1-4 provide all necessary data for calculation; type 5 is blank except

for the card type specification and is used to indicate the end of a

reach. Several different jobs may be accomplished during a single

computer run by separation of the various reaches by a type 5 card.

Card type 6 is blank except for card type and is used to indicate the
end of all of the data for a computer run.

The four types of data cards are as follows:

1) Card type (1) is a stream heading card. It provides informa-

tion on the stream, elevation increments for computation of cross-

.

sectional properties in Part 1, required accuracy in solution of

equations, allowable Froude number, values of

C
s
the weir analogy equation, and number of the first station along

and

m

for