25 Pa. Code § 88.190 - Hydrologic balance: diversions
(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 nontoxic-forming rock that will not slake
and will be free of coal, clay or shale.
(e) No diversion may be located so as to
increase 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 requirements of this subchapter.
Notes
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