1) Determine time of concentration, tc, for use in the NRCS Method for a drainage basin located near Bismarck, North Dakota, having a hydraulic path described as follows: Overland Flow: average grass, 100' long, 1.6% average slope Shallow Concentrated Flow: 680' long. 3.2% average slope Stream Flow: 2950' long, 0.61% average slope, in a trapezoidal Channel, 4 ft deep, 12 ft at the base, 20 ft at the top, n = 0.035.

1) Determine time of concentration, tc, for use in the NRCS Method for a drainage basin located near Bismarck, North Dakota, having a hydraulic path described as follows: Overland Flow: average grass, 100' long, 1.6% average slope Shallow Concentrated Flow: 680' long. 3.2% average slope Stream Flow: 2950' long, 0.61% average slope, in a trapezoidal Channel, 4 ft deep, 12 ft at the base, 20 ft at the top, n = 0.035.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

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Chapter2: Loads On Structures

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Problem 1P

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Concept explainers

Open Channel Flow

Open channel flow is a branch of fluid mechanics. It deals with the flow of fluid in an open conduit or free surface. In an open channel flow, gravity induces the flow of water whose surface is open to the air. This flow is free-falling rather than confined in rigid body conduits. The open channel flow depends upon two parameters that are the cross-section of the conduit and the velocity profile. Practical examples of open channel flow are streams, rivers, canals, and other drainage systems.In open channel flow, the cross-sectional area of at least one of the sides is exposed to air, and the surface of water faces atmospheric pressure. This flow is also known as free gravity flow. The cross-sectional area of the conduit can be either man-made or a natural channel. For instance, the flow in rivers and streams are natural conduits, and the flow in a canal and sanitary systems are man-made or engineered channels.

Question

1) Determine time of concentration, tc, for use the NRCS Method for a drainage basin located near Bismarck, North
Dakota, having a hydraulic path described as follows:
Overland Flow: average grass, 100' long, 1.6% average slope
Shallow Concentrated Flow: 680' long. 3.2% average slope
Stream Flow: 2950' long, 0.61% average slope, in a trapezoidal Channel, 4 ft deep, 12 ft at the base, 20 ft at the top, n =
0.035.

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Step 1: Given Data

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Step 2: Calculation of tc for overland flow

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Step 3: Calculation of tc for shallow concentrated flow

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Step 4: Calculation of tc for channel flow

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Step 5: Total time of concentration

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