The design of new streets and the improvement of existing streets shall consider public
safety and limit potential conflicts between storm water conveyance, vehicular traffic,
parking, pedestrian access, ADA requirements, and bicycle traffic. Storm water conveyance
on streets shall be designed to account for the cumulative impact of peak flows and
runoff volumes on the system as the storm water progresses downgrade.
Potential flooding problems or conflicts at connection points where new or modified
drainage systems (including streets, storm drains, etc.) and existing portions of
the downstream street system and storm water conveyance system shall be identified
and resolved, either in the design of the new or modified drainage system or in modifications
to the existing system. Appropriate longitudinal and cross slope serve to move any
accumulated water off the roadway as quickly and effectively as possible.
Where proposed streets cross existing or proposed watercourses, all-weather crossings
shall be required. Culverts or bridges shall be adequate to allow passage of the design
storm identified in Chapters 10.3.1 and 11.3.1.
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