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`2562. wastewater ManagE' it i a) Confined animal facilities shall be designed and constructed to retain al r facility wastewater generated, together with all precipitation on, and r' drainage through, manured areas during a 25-year, 24-hour storm. b) A'll precipitation and surface drainage outside of manured areas, including that collected from -roofed areas, and runoff from tributary areas during the storm events described in Subsection (a) of this section, shall be diverted away from manured areas, unless such drainage is..fully retained. Regional Boards may waive application of such requirements in specific instances where upstream land use changes have altered runoff patterns such that retention of flood flows is not feasible. c) Retention ponds and manured areas at confined animal facilities in oper- ation on the effective date of this section shall be protected from inundation or washout by overflow from any stream channel during 20-year peak stream flows. Existing facilities that are protected against 100-year peak stream flows must continue to provide such protection. d) New facilities shall be protected against 100-year stream flows. e) The determination of peak stream flows shall be from data provided by a recognized federal , state, local , or other agency. s f) Retention ponds shall be lined with or underlain by soils which contain at least 10 percent clay and not more tan 10 percent gravel or artificial materials of equivalent impermeability. g) Facility wastewater, collected precipitation and drainage may be discharged ' to use or disposal fields operated according to Section 2563 of this article or to wastewater treatment facilities approved by the appropriate regional board. f 2563. Use or Disposal Field Management a) Application of manure and wastewater to disposal fields or crop lands shall be at rates which are reasonable for the crop, soil , climate, special local situations , management system, and type of manure. b) Discharges of facility wastewater to disposal fields shall not result in surface runoff from disposal fields and shall be managed to minimize percolation to ground water. 2564. Management of Manured Areas a) Manured areas shall be managed to minimize infiltration of water into underlying soils. 2565. Monitoring a) Regional boards may require confined animal facility operators to undertake a monitoring program as a condition to the issuance or waiver of waste discharge requirements.