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STANDARD PROVISIONS AND REPORTING REQUIREMENTS,JANUARY 2012 -30- FOR WASTE DISCHARGE REQUIREMENTS FOR DISCHARGES REGULATED BY SUBTITLE D AND/OR TITLE 27 infiltration, inundation, erosion, slope failure, washout, and overtopping under the precipitation conditions for the unit [Title 27, § 20365(a)]. 6. Precipitation on landfills or waste piles which is not diverted by covers or drainage control systems shall be collected and managed through the LCRS, which shall be designed and constructed to accommodate the precipitation conditions for each class unit [Title 27, § 20365(b)]. 7. Diversion and drainage facilities shall be designed, constructed, and maintained to [Title 27, § 20365(c)]: a. accommodate the anticipated volume of precipitation and peak flows from surface runoff and under the precipitation conditions for the waste management unit: b. effectively divert sheet flow runoff laterally, via the shortest distance, into the drainage and collection facilities; c. prevent surface erosion; d. control and intercept run-on, in order to isolate uncontaminated surface waters from water that might have come into contact with waste; e. take into account: i) for closed waste management units and for closed portions of units, the expected final contours of the closed unit, including its planned drainage pattern; ii) for operating portions of waste management units other than surface impoundments, the unit's drainage pattern at any given time; iii) the possible effects of the waste management unit's drainage pattern on and by the regional watershed; iv) the design capacity of drainage systems of downstream and adjacent properties by providing for the gradual release of retained water downstream in a manner which does not exceed the expected peak flow rate at the point of discharge if there were no waste management facility; and f. preserve the system's function. The Discharger shall periodically remove accumulated sediment from the sedimentation or detention basins as needed to preserve the design capacity of the system. 8. Collection and holding facilities associated with precipitation and drainage control systems shall be emptied immediately following each storm or otherwise managed to maintain the design capacity of the system [Title 27, § 20365(d)].