045-12 Wyo. Code R. §§ 12-4 - Specific Provisions-Storm Sewers
(a) Connections to
Department storm sewer systems shall only be allowed if the system has the
capacity to handle the additional inflow. Construction of the connection and
restoration of pavement and right-of-way shall be as directed by the
engineer.
(b) Major trunk lines and
outfall lines, not connected with highway drainage, shall not be allowed
parallel encroachment in narrow highway rights-of-way, especially if roadway
reconstruction, widening or slope modification is contemplated in the
foreseeable future.
(c) When
parallel encroachment is allowed the line shall be located as close to the R/W
line as possible.
(d) Crossings of
the roadway and/or paved side streets and approaches may be made by either
boring a casing pipe or heavy wall thickness carrier pipe under the roadway
template. Crossings of the roadway template shall be as near to perpendicular
to the roadway centerline as possible.
NOTE: The requirement for casing of the road crossing shall be specifically discussed between the applicant's engineer and the Department's engineer and shall among other things depend on the pipeline materials used and the system's operating pressure.
(e) Depth of cover shall be a minimum of four
(4) feet below natural ground or roadway ditch flow line.
(f) Shallow depth of cover with a protective
dirt berm over the top shall not be allowed.
(g) When parallel encroachment within the
roadway template and/or the pavement section is unavoidable, the pipe and
manholes used shall be able to withstand highway loading, as determined by
manufacturers data, and be of the most durable and maintenance free
material.
(h) All manholes shall be
constructed flush with the surrounding terrain and if in the paved portion of
the roadway in a manner that allows for adjustment for future changes in
pavement thickness.
Notes
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