Amended Work Plan Kiowa Creek Watershed

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With all the work that has been done in the past there has been no coordinated watershed plan and much remains to be done to reduce flood and erosion damage to a practical and desirable level. The project watershed comprises about one -sixth of the area of the Kiowa district. . RECOMMENDED FLOOD PREVENTION PRO_ GRAM MEASURES PRIMKRILY FOR FLOOD PREVENTION ( "A" MEASURES) Flood Water Retarding Structures ~ A system of approximately 68 water retarding structures is planned f or the Kiowa Creek watershed. The dams will be of earth fill construction with natural spillways on native sod or cut spillways seeded to grass to pre- vent erosion. Based on the East Kiowa Creek study, these structures will have detention capacities that range from under 10 acre feet to slightly over 20.0 acre feet and will average around 40 acre feet per structure. The run -off from about 65 per cent of the watershed will be controlled by the system of retarding structures. The structures are designed to contain the floods which occur once in 25 years. Floods of a 50 year frequency will be suf- ficiently retarded to significantly reduce over -bank flooding. Sufficient capacity is provided in each reservoir to store the sediment anticipated to accumulate during the next 50 years. Ungated outlet conduits through the dams will release the retarded flood water so that the reservoirs will automatically empty in 24 to 36 hours. Stabilizing and Sediment Control Structures Fifty structures are planned primarily to reduce sedimentation and erosion, and to protect and maintain the capacity of the detention reservoirs. These structures will take the form of darns or diversions with all their capacity reserved for sediment storage. Channel Improvement Channel work is planned along the main stream and will involve channel- ization where needed, clearing for a defined channel, revetment, and bank protection measures. The bank protection work will consist of cable and tree revetments, small jetties, and willow plantings, and will be done mainly by District cooperators as a Fart of their individual conservation programs as a non - Federal contribution to the "A" measures program. This work should be protected from fire and livestock use to lengthen its life and encourage wildlife. 10t,SURES FOR THE CONSERVATION OF WATER AND WATERSHED LaNDS WHICH CONTRIBUTE DIRECTLY TO FLOOD PREVENTION ( "B" MEASURES) County fire protection plans, prepared by local and State representatives, are now in effect and operation. These plans provide for community pre- vention and control of grass and timber fires and are a great aid in sta- bilizing the watershed by protecting the vegetative cover.