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C) CHAPTER 10. OVERALL DRAINAGE STUDIES A detailed overall drainage study has been completed and is included separately as Appendix C entitled, Stockton Metropolitan Airport, Stockton, California, Overall Drainage Studies. The summary of this drainage study and recommendations for design are presented in this chapter. The airport drainage is currently accomplished by a series of drainage pipes and inlet structures and ditches. These all discharge into the Mansville Ditch or Webers Slough. The Mansville Ditch and Webers Slough discharge into French Camp Slough which in turn discharges into the San Joaquin River. The Webers Slough starts about six miles east of the airport and is not interconnected with any other slough or creek. Some offsite drainage is carried through the ! . airport in Webers Slough. The Mansville Ditch originates on the airport. The airport proposes the development of additional airline facilities, air cargo facilities, and commercial industrial development. The total commercial/industrial development anticipated consists of 335 acres in the Airport East property, 78 acres in the Air Metro Industrial Park, and 66 acres in the Farmington Fresh facility. The requirements of the San Joaquin County Department of Public Works for drainage systems at the airport are that any development on the airport does not increase the rate of storm water - discharge into Webers Slough or the Mansville Ditch at the location where they leave the airport property. The analysis conducted was based on a 100-year storm of 96-hour duration. The stud showed Y Y y s o ed that the necessary storm water detention on the airport can be provided by the construction of a series of detention basins located between the existing Runway I IL-29R and the proposed north parallel taxiway and the construction of a detention pond north and south of Arch Airport Road together with pump station to discharge the water from this pond into the Mansville Ditch. With this design the total discharge from the airport under fully-developed conditions into the Mansville Ditch and Webers Slough will be less than that which occurs under present conditions. The adequacy of the Mansville Ditch from Airport Way to French Camp SIough to accommodate the storm flow in a 100-year storm will be evaluated during the design of the north airport drainage system and any required improvements to the Mansville Ditch will be provided at that time. If it is not feasible to increase the capacity of Mansville Ditch, then all or a portion of the water developed from the airport will be diverted north to the Little John Creek or south to Webers Slough. The adequacy of Webers Slough and the pumps at the existing pump station to accommodate the storm flow in a 100-year storm will be evaluated during the design of the north airport drainage system and any required improvements to the Webers Slough system will be made. The drainage system at the airport will be designed following the requirements set forth in the Overall Drainage Studies report, Appendix C. �f 10-1 1. .