Channel design.
Unless approved by the director of engineering, open channels shall not be permitted
when the inside pipe diameter required to carry the fully developed 100-year flow
is 60 inches or less. Exceptions to this prohibition might be residential estate subdivisions
and other areas where there are significant natural features, including trees, springs,
exposed channels, and other environmental items that would work positively into the
aesthetics of a development. Criteria for determining the nature of open channels
is found in the engineering design manual.
(b)
Starting water surface condition.
When performing hydraulic analyses for channel or drainageway design, the starting
water surface shall be based on the criteria found in the engineering design standards.
