25 Pa. Code § 87.105 - 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 peak
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 topsoil
shall be removed, stored on a stable site, and protected against erosion and
compaction until restoration of the diversion.
(d) 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-forming or toxic-forming rock that will not slake and will be free of
coal, clay or shale.
(e) A diversion
may not 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 §
87.147 (relating to revegetation:
general requirements).
Notes
This section cited in 25 Pa. Code § 87.72 (relating to diversions); 25 Pa. Code § 87.131 (relating to disposal of excess spoil); 25 Pa. Code § 87.147 (relating to vegetation; general requirements); 25 Pa. Code § 87.202 (relating to definitions); and 25 Pa. Code § 87.207 (relating to treatment of discharges).
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