ADS Environmental Services Profile Software 950015B6 - Manual (Page 240)

4-18 Profile Software User's Guide
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Generating Average Coefficients
After entering and reviewing the field confirmations, choose which
coefficient variables you want to generate: the hydraulic coefficient
or the roughness and slope coefficients. Base your decision on
which flow quantities you want to generate: Manning or
Colebrook-White. Generate an HC for Manning quantities, and
generate roughness and slope coefficients for Colebrook-White
quantities.
Generating the Hydraulic Coefficient
When you want to generate Manning quantities, use the Quantity
Coefficient Generator to develop an Average HC from all of the
selected field confirmations. An HC automatically generates for
each individual field confirmation after the confirmation
information is entered into the Quantity Coefficient Generator
table.
Perform the following steps to generate and review an Average
HC:
1. Enter all field confirmations.
2. Review the Confirmation Statistics section of the screen to
determine how accurately the Average HC value quantifies
flow.
3. Specify which confirmations are included in the Average HC
calculation. Place an I in the Use field of any confirmation you
want to ignore from the Average HC calculation. Ignore any
field confirmations taken during non free-flow conditions or
when the manual measurement may have been in error.
If you are still dissatisfied with the Average HC, you can generate a
Bestfit HC. Refer to Generating Bestfit Coefficients on page 4-21
for more information.