FLOOD01169

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Title: Design Guidelines and Criteria Channels and Hydraulic Structures on Sandy Soil
• Date: 6/1/1981
• Prepared For: UDFCD
• Prepared By: Simons Li & Associates Inc.
• Floodplain - Doc Type: Educational/Technical/Reference Information

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that is hetter suited to the des i gn engi neer' s needs. Appli cation of such

.

a methodology must he both accurate and efficient.

The design standard presents a sediment transport analysis method which

meets the above criteria. The determination of sediment transport as presented

in this design standard is based on easy to apply power relationships between

sediment transport rate and velocity and depth.

The sediment transport rate in a river can generally be presented by

a simplified equation relating to flow depth and velocity

C2 C3
qs = C 1 y V

(3-1)

where, qs = sediment transport rate in cfs/foot,

Y = flow depth in feet,

V flow velocity in feet per second,

Cl, C2, C3 = constants.

Values of C1, C2, and C3 for sand materials are presented in Table 3-1

with limitations of hydraulic parameters noted. Values of Cl, C2, and

C3 are also presented in Figure 3-1. The sediment transport rate should be

determined using the Meyer-Peter, Muller equation and the Einstein method as

presented in Section 2.5.3; however, the above simplified equation with the

recommended values for Cl, C2, and C3 will provide the design engineer

with a reasonable first-order estimate of sediment transport as long as it

is used within the specified limits of particle size and flow velocity. The

sediment transport rate should be determined for a variety of flow conditions

and sediment sizes likely to occur in the study reach.

The equilibrium channel slope is defined as the slope at which the

channel's sediment transporting capacity is equal to the incoming sediment

supply. Equilibrium slope should be determined for frequent flood flows,