Hydraulic Elements II (Library)

HELE II: Hydraulic Elements II

Irregular Channel Hydraulics Module:

This user-interactive computer program provides the capability to determine normal depth in an irregular channel. Using coordinate and Manning’s friction factor information, up to 30 subchannels can be combined to form an irregular channel cross-section. Then, for a constant slope, normal depth is computed in each subchannel simultaneously in order to provide an overall approximation to normal depth in the irregular channel. Includes computations for:

– Subchannel average velocity
– Flow top-width
– Froude number
– Flow area
– Hydraulic depth

Also includes an internal computer tutor text providing a review or first-course for the program user.

Gradually Varied Flow Water Surface Profile

Analysis Module:

Using the well-known standard step method, an irregular channel water surface profile regime can be determined. The program user can specify up to 20 separate (single flowline) irregular channel cross-sections with individual friction factors, velocity head correction coefficients, and miscellaneous loss factors. The program estimates the gradually varying water surface profile by balancing the energy equation at user specified locations along the channel.  All geometric and parametric information is averaged at each energy balance location. Results are given in tabular form as used in "Open Channel Hydraulics," (Chow 1959).  Both subcritical and super critical flow regimes may be analyzed. Interface program to WSPG and HEC-2 available (program CH3).

Retarding Basin Modeling Module:
This user-interactive computer program allows the program user to model retarding basin routing by the well-known modified Pul’s method. Some of the program features are listed in the following:

– Internal computer tutor text providing the program user a review or first-course.
– Computer output prepared for drainage reports and includes both basin inflow and basin outflow hydrograph plots superimposed with the computed outflow, basin depth, and storage information.
– Retarding basin outflow, depth, and storage versus time computations.
– Internal editing capability enabling the user to change program information.

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