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<br />pipelines where this preference was expressed by the landowner, water <br />measuring devices, and subsurface drains identified as needed improve- <br />ments during field inventories. <br /> <br />It is assumed, for this alternative, that 80 percent of the management <br />practices will be implemented and 80 percent of the needed measures will <br />be installed. <br /> <br />Non-Irrigated Upland - This plan recommends grazing management practices <br />the same as plan number one. The physical measures, in addition to <br />pasture planting and fencing, include range seeding, brush management, <br />grazingland mechanical treatment such as contour furrowing, pitting, or <br />chiseling by mechanical means to reduce runoff, water spreading over <br />relatively flat areas to enhance vegetative growth. <br /> <br />This plan may be considered as a more intensive level of improvement <br />recommended for sal inity control. Implementation of this plan will <br />reduce salt loading to the Colorado River by 58 percent at a one-time <br />installation cost of $23,471,000 for improvements on private land. <br /> <br />Plan No. 3 <br /> <br />Irrigated land - This plan recommends changing from present on-farm <br />practices to different methods of irrigation such as drip and sprinkler <br />where appropriate. These methods will not be applicable in all cases <br />and, therefore, consideration also is given to the type of improvements <br />recommended under Plan Two. Improvements recommended by this plan, that <br />are different from Plan Two, consist of converting 1,300 acres to drip <br />irrigation, 1,900 acres to sprinkler irrigation. Unit cost for ditch <br />lining under this plan includes a cost for install ing some devices for <br />automatic time control of irrigation water. The total length of ditches <br />to be lined reflects the fact that drip and some sprinkler irrigation <br />systems will be suited to water conveyance different from lined ditches. <br /> <br />For this plan it was again assumed that 80 percent of the management <br />practices will be implemented and 80 percent of the needed measures will <br />be installed. <br /> <br />Non-Irrigated Upland - This plan recommends more extensive treatment for <br />the non-irrigated upland area to maintain maximum vegetative cover In <br />the watersheds. Seeding on critically eroding areas and physical <br />measures the same as plan number two will further reduce runoff and <br />sedimentation. <br /> <br />,~~ <br />l <br /> <br />39 <br />