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- ~~':,,:~\:';.;~':,J.:;' ;;:!f'-,~~';o'};~ _ ;';_:C,' ",,''"'''''_' ,,",.0,",,'" '."." -" , -- - ___~'n __",,,.__2--' i~ , c~ --1 -;.} ',1 i '.~ .~j d "..j .--1 >--:,:::~~~,>-'" ~ IX) -~; C\J (~~ ) (~-) STUDY ITEM 5 - EXAMINE EXISTING DRAINAGE SYSTEMS AND IDENTIFY 'lliOSE TEAT NEED TO BE DEEPENED AND/OR REQUIRE STRUCI'URAL REPLACE- MENTS AND 'lliOSE THAT NEED 'IO HAVE Oill'LETS CLEANED OR DEEPENED OR BOrR (Refer to Map-7, Drainage Systems). The Department of Agriculture is restricted by the Agricultural Appropriations Act of 1965 (PL 89-316) to not furnish tedmical or financial assistance for drainage of wetland types 3, 4 and 5. These wetland types are defined in USOl Fish and wildlife circular 39, "Wetlands of the United States". The data for drainage system needs were Cleve loped by contacting representatives of the eight drainage systems of record in the courthouses of the study area and three other organized group drainage systems. The data represent what representatives of the systems plan to do in the next 10 years and are as finn as plans of this nature can be. Historically the drainage districts of the study area were formed to fumish drainage for specific areas. Once this was done further enlargerrent of the district or the system was usually not consiClered. Many of the drains in the operating systems function as drains only part of the year. During the gr=ing season the drains are checked to help replenish and maintain the water table for subirrigation. often diversion rights for irrigation were given on outlet ditches in return for easarents and rights-of-way. 'Ihese diversions further check the flav so that laver segrrents of drainage systems do not proviCle effective drainage. The system of drainage, subirrigation and water rights has beca:re so CCXl\Plicated that this study could not possibly resolve the desires of the people for additional organized drainage systems. (study Item 6 deals with on-the-farm needs for drainage.) Three hundred thousand acres of land could be benefited by drainage that is physically feasible. This is a large figure and relies sare on individual interpretation of 'benefit'. This benefit would be Clependent upon irrigation water availability, changes in irrigation water distribution, and changes in rrethods of irrigating and would involve CCXl\Plexities beyond anticipation. planning could proceed in small segments - detennining needs and desires of individual CMIlers and Cleve loping systems of drainage and subirrigation control satisfactory to those in the area. This study did not atterrpt to locate areas of interest in drainage other than what might appear in on-the-farm data sheets which are covered in study Item 6. (Table 4 shaNs planned improvements by the 11 established drainage systems studied.) No activity in the organization of neN systens or districts was noted in the study. Total planned improvements for the next 10 years by established systems would require about $417,000. 10 ~] ~1 :~; ~~ ,;,.