City of Frisco Engineering Standards

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Engineering Standards Version 6/19/12 D. Should mitigation be required under Section 404 of the Clean Water Act, the areas shall be identified on the engineering construction plans. E. Refer to Section 4.15 for floodplain reclamation requirements. 4.11 Open Channel Design Excavated open channels may be used to convey storm waters where the construction costs and/or long-term maintenance cost involved with a closed storm sewer system is not justified economically. Open channels shall be designed to convey the full design discharge. The allowable excavated channel cross section is shown on Figure 5. The maximum velocities allowed for various types of excavated channel cover are shown in Table 4.6. These maximum velocities do not apply for drainage facilities discharging off-site. A downstream assessment in accordance with Section 4.03.B shall be performed to determine maximum discharge velocities. FIGURE 5: Open Channels -Excavated A. Unlined unvegetated excavated channels are not allowed. Construction of excavated channels will not be considered complete until the channel banks are stabilized. Vegetation selected for channel cover must conform with allowable vegetation from the Approved Material List. Section 4 – Drainage Design Requirements May 2012 Page 4-29
Engineering Standards Version 6/19/12 B. Supercritical flow shall not be allowed in channels except at drop structures and other energy dissipators. C. At transitions in channel characteristics, velocities must be reduced to the maximum velocity per the downstream assessment in accordance with Section 4.03.B. Velocities must be reduced before the flow reaches the natural channel using either energy dissipators and/or wider less steep channel. D. Channel armoring for erosion control shall be provided where deemed necessary by the Director of Engineering Services. E. If the channel cannot be maintained from the top of the bank, a maintenance access ramp shall be provided and included within the drainage easement. F. Minimum channel bottom widths are recommended to be equal to twice the depth of the channel. Any permanent open channel shall have a minimum bottom width of 5’. G. All open channels require a minimum freeboard of 1’ freeboard. H. The minimum slope for an excavated improved channel is 1% unless a pilot channel is constructed, or otherwise approved by the Director of Engineering Services. Table 4.6 provides allowable ranges for roughness coefficients of open channels. Table 4.6 Channel Roughness Coefficients Channel Description Roughness Coefficient Minimum Normal Maximum Minor Natural Streams Moderately Well Defined Channel -grass and weeds, little brush 0.025 0.030 0.033 -dense weeds, little brush 0.030 0.035 0.040 -weeds, light brush on banks 0.030 0.035 0.040 -weeds, heavy brush on banks 0.035 0.050 0.060 -weeds, dense willows on banks 0.040 0.060 0.080 Irregular Channel with Pools and Meanders -grass and weeds, little brush 0.030 0.036 0.042 -dense weeds, little brush 0.036 0.042 0.048 -weeds, light brush on banks 0.036 0.042 0.048 -weeds, heavy brush on banks 0.042 0.060 0.072 -weeds, dense willows on banks 0.048 0.072 0.096 Flood Plain, Pasture -short grass, no brush 0.025 0.030 0.035 -tall grass, no brush 0.030 0.035 0.050 Flood Plain, Cultivated -no crops 0.025 0.030 0.035 -mature crops 0.030 0.040 0.050 Flood Plain, Uncleared -heavy weeds, light brush 0.035 0.050 0.070 Section 4 – Drainage Design Requirements May 2012 Page 4-30
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City of Frisco Engineering Standards

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