Discharge from dams, ponds, embankments, impoundments and diversions shall be controlled by emergency dissipators, riprap, channels or other devices to reduce erosion, to prevent deepening or enlargement of stream channels, and to minimize disturbance of the hydrologic balance. Discharge structures shall be designed according to standard engineering design procedures.
25 Pa. Code § 90.109
This section cited in 25 Pa. Code § 90.113 (relating to hydrologic balance: coal processing waste dams and embankments).