Ohio Admin. Code 1501:21-13-04 - Pipe conduit spillways, general requirements
(A) All pipe conduits shall convey flow at
the maximum design velocity without damage to the interior surface.
(B) Seepage control devices acceptable to the
chief shall be installed. .
(C) Adequate allowances shall be incorporated
in the design to compensate for settlement and possible elongation of the pipe
conduit.
(D) An anti-vortex device
that is satisfactory to the chief shall be installed at the intake of all pipe
and riser spillway systems. Anti-vortex devices may also be required for other
spillway types as necessary to improve the performance of the
spillway.
(E) A trash rack that is
satisfactory to the chief shall be installed at the intake of all pipe and
riser and/or drop inlet type spillway systems to prevent clogging the pipe
conduit. Trash rack devices may also be required for other spillway types as
necessary to ensure the performance of the spillway.
(F) An emergency overflow spillway
shall be
is
required, except when specifically exempted by the chief. A vegetated or
unlined emergency spillway will be approved by the chief, but only after the
applicant has demonstrated that it will pass the design flood without
jeopardizing the safety of the structure. The average frequency of use for a
vegetated or unlined emergency spillway must be predicted to be less than the
following criteria unless otherwise approved by the chief:
(1) Once in fifty years for class I
dams;
(2) Once in twenty-five years
for class II dams; and
(3) Once in
ten years for class III dams.
(G) The pipe conduit shall be of such size as
to remove from the reservoir within ten days following passage of the design
flood peak at least eighty percent of the water temporarily detained in the
reservoir above the elevation of the primary (principal) spillway.
Notes
Promulgated Under: 119.03
Statutory Authority: 1521.06
Rule Amplifies: 1521.06, 1521.061, 1521.062
Prior Effective Dates: 04/15/1972, 10/15/1981, 12/09/1999, 01/16/2005
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