TROY

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GEM 4409HydrologyFall 2005

• TROY
• UNIVERSITY

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Hydraulically Most Remote Point
Time of Concentration (tc)

• Size
• Shape
• Slope
• Flow
• Cover

Point of Concentration
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Time of Concentration (tc)

• Overland Flow
• tc 0.0078 (L1.5/H0.5)0.770 Kirpich
• Channel Flow / Storm Sewer Flow
• tt L/V LA/Q (1 min/60 sec)

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Time of Concentration (tc)

• Flow Modification Factors
• Natural basins w/ well defined channels 1.0
• Bare earth 1.0
• Mowed grass 1.0
• Grassed surface 2.0
• Concrete or asphalt surface 0.4
• Concrete channels 0.2

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Open Channel FlowQ VA
Mannings Equation V 1.49/n.R2/3.S1/2
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Volumetric Flow
Q VA

• V Average Velocity
• of the Flow
• A Wetted X-Sect. Area

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Intensity-Duration Curve for Huntsville
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Intensity-Duration Curve for Birmingham
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Intensity-Duration Curve for Montgomery
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Intensity-Duration Curve for Mobile