Current through Register Vol. 43, No. 39, September 26, 2024
(a) In addition
to meeting the requirements of K.A.R. 5-40-40, each proposed high-impact dam
shall have at least the following number of geotechnical test holes:
(1) A sufficient number of properly placed
test holes to be representative of the geology under the proposed dam
embankment, with an average of at least one test hole every 100 feet along and
as close to the centerline of the dam as practical and a minimum of three test
holes; and
(2) a test hole as
close as practical to the anticipated location of the following:
(A) The base of the drop inlet; and
(B) the support of the outlet
pipe.
(b) At
least one representative sample of undisturbed soil shall be tested to
determine shear strength parameters, permeability, and compressability.
(c) The geotechnical investigation
shall determine the following for at least one representative sample:
(1) Atterberg limits;
(2) the settlement characteristics of the
proposed embankment materials and the foundation of the dam;
(3) the Proctor compaction curves of soils;
(4) gradation tests of foundation
materials, especially where drain systems could be located; and
(5) any other properties necessary to design
a dam to meet the requirements of the regulations of the chief engineer, sound
engineering principles, and commonly accepted engineering practices.
(d) Each existing unpermitted,
illegal dam shall have the same level of geotechnical investigation as that
required for a proposed dam, except that testing the borrow area shall not be
required, before a permit may be issued. In addition, the following properties
shall be determined:
(1) The condition of all
conduits passing through the embankment and the condition of the embankment in
the vicinity of the conduits;
(2)
the in situ density of the existing embankment and its foundation;
(3) the condition of the embankment,
including any slides, seeps, saturated areas, sloughs, and other visible
anomalies in the embankment; and
(4) a slope stability analysis of the
existing embankment, which shall be performed according to the requirements of
K.A.R. 5-40-46.
