OCR Text |
Show expected to develop high water tables under Unit operation. Subsurface drainage would be required to control these water tables thus making this development possible. There are no unusual salinity or sodic problems in this area. Drainage waters from the Mona- Nephi Area would flow into the Mona Reservoir and would be used for irrigation in the Elberta Area. ( d) Elb erta - Mos ida Area Return flow waters from the new lands of the Musida Area would be highly concentrated with salt. These flows would be stored in the pond behind the Goshen Bay Dike to prevent them from entering the lake. The inflow of salts to this area would concentrate salts behind the dike and create a saline ecosystem. The lands along the lower slopes of the Mosida Area would be expected to develop a high water table under Unit development but could be controlled with Unit drainage systems. Salinity and sodic conditions are also found in the non- irrigated soils of these lands. Leaching of these salts can be accomplished through irrigation and drainage as has been evidenced by special leaching tests conducted by the Bureau of Reclamation in 1962 in these non- irrigated lands. As the residual salts are leached out, it is anticipated the salt contribution would diminish to about 2 tons per acre annually. ( e) Duchesne River Area In the Duchesne River Area some of the designated Unit lands, located under the Taylor Canal in the west end of Pleasant Valley, have become heavily saline since the initial land classification and drainage investigations were conducted. The Bureau of Reclamation is presently studying these lands and if warranted these lands would be excluded from the Unit plan and no drainage would be provided for them. However, subsurface drains would still be planned for other high water table Unit lands under the Taylor Canal which do not have a salinity problem. 274 |