Administrative Rules of Montana
Department 17 - ENVIRONMENTAL QUALITY
Chapter 17.24 - RECLAMATION
Subchapter 17.24.6 - Strip and Underground Mine Reclamation Act: Transportation Facilities, Use of Explosives, and Hydrology
Rule 17.24.634 - RECLAMATION OF DRAINAGE BASINS
Universal Citation: MT Admin Rules 17.24.634
Current through Register Vol. 6, March 22, 2024
(1) Reclaimed drainage basins, including valleys, channels, and floodplains must be constructed to:
(a) comply with the
postmining topography map required by ARM
17.24.313(1) (d)
(iv) and approved by the
department;
(b) approximate
original contour;
(c) an
appropriate geomorphic habit or characteristic pattern consistent with
82-4-231(10) (k),
MCA;
(d) allow the drainage channel
to remain in dynamic equilibrium with the drainage basin system without the use
of artificial structural controls unless approved by the department;
(e) provide separation of flow between
adjacent drainages and safely pass the runoff from a six-hour precipitation
event with a 100-year recurrence interval, or larger event as specified by the
department;
(f) provide for the
long-term relative stability of the landscape. The term "relative" refers to a
condition comparable to an unmined landscape with similar climate, topography,
vegetation and land use;
(g)
provide an average channel gradient that exhibits a concave longitudinal
profile;
(h) establish or restore a
diversity of habitats that are consistent with the approved postmining land
use, and restore, enhance where practicable, or maintain natural riparian
vegetation as necessary to comply with ARM subchapter 7; and
(i) exhibit dimensions and characteristics
that will blend with the undisturbed drainage system above and below the area
to be reclaimed and that will accommodate the approved revegetation and
postmining land use requirements.
(2) Any permanent structure placed or constructed within a perennial or intermittent stream must be certified by a qualified licensed professional engineer as meeting the performance standards and any design criteria specified by the department.
AUTH: 82-4-205, MCA; IMP: 82-4-231, MCA
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