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I I I I I I I I I I I I I I I I I I I sound database from which extrapolations of future demands can be made. The current water requirements within the lID have been divided into four major categories: 1. Agricultural requirements, which includes consumptive use, crop leaching, land reclamation and on-farm operations. 2. Municipal and industrial uses. 3. Other non-farm beneficial uses such as feedlots, golf courses, rural schools, etc. 4. Operational water required for the transmission/distribution of water to the users. III.Cl Current Agriculture Water Use Agricultural water use within the District includes four components: tailwater, reclamation leaching, crop leaching, and crop consumptive use. Tailwater is defined as surface runoff occurring at the low end of the irrigation run as water is being applied. Irrigation methods within lID are primarily gravity flow. Absent a collection reuse system (i.e. tailwater return system), tail water occurring during any irrigation is necessary for adequate irrigation at the low end of the field. Leaching is defined as the water applied to land in order to remove harmful salts from the rootzone. The difference between crop leaching and reclamation leaching is that crop leaching applies to water applied to a cultivated field while reclamation leaching applies to water that is applied to idle land. Crop consumptive use is defined as the sum of water used by plants in transpiration and growth (stored in plant tissue) and evaporation from adjacent soil and water surfaces during and shortly after irrigation. The four components of lID's agricultural water use were investigated by Boyle Engineering in a study completed for lID in August, 1993 (On-Farm Irrigation FJjiciency. Special Technical Report for Imperial Irrigation District, Boyle Engineering Corp., August, 1993). The Boyle Report used a water balance approach to determine conswnptive use of applied water as follows: Draft: Subject To Revision 12/21/95 18