§ 77.524. Diversions and conveyance.
(a) Overland flow, shallow groundwater flow from undisturbed areas and flow in ephemeral streams shall be diverted away from disturbed areas by means of temporary or permanent diversions to prevent water from draining into the operation, to minimize erosion, to reduce the volume of water to be treated and to prevent or remove from contact with acid-forming or toxic-forming materials.
(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) A diversion may not be located in a way that increases the potential for landslides or other offsite damage.
(d) When no longer needed, the diversion shall be regraded to blend with the natural contours and drainage pattern, and revegetated under § 77.611 (relating to general requirements).
Source The provisions of this § 77.524 adopted March 16, 1990, effective March 17, 1990, 20 Pa.B. 1643.
Cross References This section cited in 25 Pa. Code § 77.460 (relating to diversions).
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