HY8:Contra Costa Basin

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Contra Costa Basin

The input variables required for this calculation is the following:

  • Baffle Block Height Ratio -- The ratio of the baffle block height to baffle block distance from the culvert.
  • End Sill Height to Maximum Depth Ratio -- ratio to determine the end sill height from the maximum depth.
  • Basin Width -- The channel width is recommended for the basin width.

The following figures show the design of a Contra Costa basin.


Variables from the figure

  • D -- Diameter of culvert
  • y0 -- Outlet depth
  • y2 -- Approximate maximum water surface depth
  • y3 -- Basin exit velocity
  • V0 -- Outlet velocity
  • V2 -- Exit velocity
  • h1 -- Height of small baffle
  • h2 -- Height of large baffle
  • h3 -- Height of end sill
  • L2 -- Length from culvert exit to large baffle
  • L3 -- Length from large baffle to end sill
  • LB -- Basin length