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 San Antonio
 Unified Development Code
 Appendix H. STORM WATER DESIGN CRITERIA MANUAL
 Chapter 9. OPEN CHANNELS
 Appendix 9.3. Design Guidelines

  § 9.3.8. Channel Velocity  

Latest version.

  • The following Table 9.3.8 shall be used to determine maximum permissible channel velocity.

    Where velocities are in the supercritical range, allowance shall be made in the design for the proper handling of the storm water.

    Table 9.3.8 - Velocity Control

    Velocity (fps) Type of
    Facility
    Required     		Hydraulic
    Radius (ft.)     		Correction
    Factor     		Maximum
    Permissible
    Velocity (fps)
    1 to 6
    (Maximum
    Average
    Velocity = 6 fps)     		Vegetated Earthen Channel 0-1
    1-3
    3-5
    5-8
    8-10
    Over 10     		0.8
    0.9
    1.05
    1.15
    1.225
    1.25     		5
    5.5
    6.3
    6.9
    7.35
    7.5
    *6 to 12 Turf Reinforcement Mat (TRM) N/A N/A 12
    6 to 8 Concrete Retards N/A N/A N/A
    >8 Concrete Lining or Drop Structures N/A N/A N/A
    *If Turf Reinforcement Mat (TMR) is proposed, please see City of San Antonio Standard Specifications for Construction Item 554 for submittal requirements. The improvement plan sheets should include the location of the placement, details, and manufacturer's installation instructions.

     

    * If Turf Reinforcement Mat (TRM) is proposed, please see City of San Antonio Standard Specifications for Construction Item 554 for submittal requirements. The improvement plan sheets should include the location of placement, details, and manufacturer's installation instructions. The use of velocity protection devices other than TRM shall be submitted to and approved by the Director of TCI prior to approval of construction plans.