25 Pa. Code § 88.295 - Hydrologic balance: diversions and conveyances
(a) Surface water and shallow groundwater
flow from undisturbed areas which will drain into the affected area shall be
intercepted and diverted away from the disturbed area by means of
diversion.
(b) Diversions shall be
designed, constructed and maintained using current engineering practices to
pass safely the peaks runoff from a precipitation event with a 2-year
recurrence interval for temporary diversions and 10-year recurrence interval
for permanent diversion. If necessary to protect public health and safety or
prevent pollution, a larger event shall be used.
(c) All soil shall be removed, stored on a
stable site and protected against erosion and compaction until restoration of
the diversion.
(d) Any diversion
shall be vegetated or otherwise stabilized to prevent erosion or contributions
of sediment to stream or runoff outside the affected area. Asphalt, concrete or
other similar lining shall only be used when approved by the Department. Riprap
shall be nondegradable, nonacid or toxic-forming rock that will not slake and
will be free of coal, clay or shale.
(e) A diversion may not be located in a
manner that increases the potential for landslides or other offsite
damage.
(f) Excess material shall
be placed in the backfilling, or at an excess spoil disposal area.
(g) When no longer needed, the diversion
shall be regraded to blend with the natural contours and drainage pattern, and
revegetated in accordance with the requirements of this subchapter.
(h) Diversions may not be constructed or
operated to divert water into underground mines without the approval of the
Department. Such discharges must meet the requirements of this
chapter.
(i) Diversions shall not
be constructed or operated to divert water into underground mines without the
approval of the Department.
Notes
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