Dr. Victor Miguel Ponce

4731. DIRECTSTEP Documentation

DIRECTSTEP will calculate the length of the S3 water-surface profile in trapezoidal, triangular, or rectangular prismatic channels using the direct step method (Chow, V. T.: Open-Channel Hydraulics, McGraw-Hill, 1959). The depth increment is set at 1 mm (0.04 in). Click the YES button if you are using SI units; click NO if you are using U.S. customary units. In SI units, use meters and cubic meters per second; in U.S. customary units, use feet and cubic feet per second. The program will prompt you to enter discharge Q, bottom width B, side slope z, bottom slope S, Manning n, and upstream depth yu. The program will calculate the normal depth downstream. To specify a triangular channel, enter bottom width B equal to 0. To specify a rectangular channel, enter side slope z equal to 0. Enter bottom slope S in dimensionless form (Example: 0.003). The program reports the normal depth downstream, the number of 1-mm (0.04-in) depth intervals, and the channel length (m or ft) to 50, 20, 10 and 1 mm (2, 0.8, 0.4, and 0.04 in) below normal depth. The last value (1 mm) is taken as the length of the S3 water-surface profile. Caution: Please make sure that your input data makes sense from a hydraulic standpoint. The upstream depth yu should be smaller than the downstream normal depth for the specified hydraulic conditions.

Click  -here- to view a sample data set.

Click  -here- to view water-surface profiles.

RUN!

DISCLAIMER: The developer makes no warranties, expressed or implied, concerning the accuracy, completeness, reliability, or suitability of this program for any one particular purpose. It is understood that the user proceeds at his/her own risk.

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