Kan. Admin. Regs. § 5-40-46 - Side slopes of an earthen dam
(a) The side
slopes of each earthen dam shall be designed and constructed to be stable and
easily maintained.
(b) A slope
stability analysis shall be required on each high-impact dam.
(c) If a slope stability analysis is
required, the minimum factor of safety shall be based on the steady-state
seepage load condition with the water level at the elevation of the lowest
open-channel spillway or other uncontrolled spillway with a trash rack that
meets the requirements of K.A.R. 5-40-51, as shown in the following table:
Class size Hazard class Factor of safety
4 A 1.4
3, 4 B 1.5
1, 2, 3, 4 C 1.5
(d) Each dam whose face is subject to
prevailing winds shall be given additional protection from erosion caused by
wave action, which may include a flatter side slope, the use of riprap, or the
use of grass or vegetation adapted to fluctuating water levels. The design of
any slope protection for the embankment and the auxiliary spillway or service
spillway shall be shown on the plans. If no slope protection is provided,
regardless of the orientation of the dam, the design report shall provide
justification for not having slope protection.
(e) The steepest allowable design side slope
shall be three horizontal units to one vertical unit on the upstream side of
the dam, and two and one-half horizontal units to one vertical unit on the
downstream slope of the dam.
Notes
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No prior version found.