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An alternate overflow arrangement woUld be to construct a modified version of the outfall structure which was used for the sewage lagoon. Some modificationEi for flow may need to be considered. A structure of this type would allovl removal of water at alternate depths. The intake should be equipped with a fish screen. o wildfowl area overflow. It is desirable to provide a flow su~ficient to maintain a flushing action on the waterfowl area for water quality reasons already discussed. Watert;owl pond effluent could be discharged either to the Uncompatigre or Gunnison Rivers; the State of Colorado requirement~ dictated in state water law should be consulted, along with 'requirements for effluent discharge quality, prior to making this decision. Water quality of \;'aterfowl pond effluent could be of concern due to mineral concentrations and potentiE11 bacterial pollution, and a section 402 permit from the Colorado Department of Health may be needed. If structures or fill are placed in the flood plain, a section 404 permit may also be required from the Regulatory Division of the Corps of Engineers. One alternative for discharge of flows from the waterfowl area is to guide the flow to th~ nearby existing drain running north along the east side oJj the fish pond, thence to the Gunn,ison River. The waterfdwl overflow could be collected in a catch basin or other collector structure, near the northeasterly corner of the wateJ:1fowl pond, and guided by pipe to the receiving drain. Ttie basin would be a standard shallow catch basin, filled with :rock or equipped with a fish screen, and the exit pipe would be directed to a receiving pipe, open drain, or the river. The rock or screen in the catch basin would serve to prevent fish intrusion during river flows high enough to back up through the pipe. Another alternate overflow from the waterfowl site could be the use of a series of rock sill :structures within a rock-lined channel. The channel would be C)'uided to either river or the aforementioned receiving drain. o Outfall. The top 4 or 5 feet of the fish ponclmay need to be drained to allow for cleaning, repairs, m~difications, or other needs, The outfall structure which 'serviced the sewage lagoons when they were in operatior, is still in satiSfactory condition, according to City 'of Delta officials. This outlet could be maintained for similar use with the fish ponds. Since no structures 'are scheduled to be placed in the d,,,ep portion of the pond" repairs or modifications ther,,, would not be anticipated. 8