Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
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<strong>Isco</strong> <strong>Flowlink</strong> <strong>5.1</strong> ® <strong>Software</strong><br />
Site Window - 4100/4200/6700<br />
Refer to the <strong>Isco</strong> Open Channel Flow Measurement Handbook for<br />
more information.<br />
Slope<br />
When used in a Manning formula, slope is entered as a<br />
dimensionless quantity, delta Y/ delta X, not as percent slope. Or,<br />
as otherwise expressed:<br />
Roughness<br />
The roughness coefficient is an index of frictional resistance to<br />
the flow offered by the conduit. This coefficient is one of the<br />
required values when using a Manning formula for flow<br />
conversion. Selecting a value is essentially estimating the<br />
resistance to flow. The table below provides a list of roughness<br />
coefficients for various channel materials and conditions. Three<br />
values, minimum, normal, and maximum, are provided. Your<br />
selection will depend on the estimated resistance to flow.<br />
Description of channel Min Norm Max<br />
I. Closed conduit - partly full<br />
A. Metal<br />
1. Steel<br />
a. Lockbar and welded 0.010 0.012 0.014<br />
b. Riveted and spiral 0.013 0.016 0.017<br />
2. Cast Iron<br />
a. Coated 0.010 0.013 0.014<br />
b. Uncoated 0.011 0.014 0.016<br />
3. Wrought Iron<br />
a. Black 0.012 0.014 0.015<br />
b. Galvanized 0.013 0.016 0.017<br />
4. Corrugated<br />
a. Subdrain 0.017 0.019 0.021<br />
b. Storm Drain 0.021 0.024 0.030<br />
B. NonMetal<br />
1. Acrylic 0.008 0.009 0.010<br />
2. Glass 0.009 0.010 0.013<br />
3. Wood<br />
a. Stave 0.010 0.012 0.014<br />
b. Laminated, treated 0.015 0.017 0.020<br />
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