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Highlight 8-19 of the HRS Guidance Manual, page 226

Highlight 8-19 : Drainage Area Restricted by Man-Made Structures

  • Draw flow lines perpendicular to the nearest upgradient contour line from the edges of each source.

  • Extend the flow lines between contour lines in the upgradient direction until a topographic high is encountered (a closed ring on a topographic map).

  • A roadway and railroad tracks are located on opposite sides of the surface water body.

  • The roadway and railroad tracks are upgradient of the sites and are considered to divert runoff from the sites.

  • Boundaries of the drainage area do not extend beyond the railroad tracks or roadway.


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