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1002505 I I i I : o Coordinate and attend a meeting with Don Miles, Extension Irrigation Engineer for Colorado State University, to discuss the results of the above investigations and select appropriate data for the Phase 2 analyses, Summary Table 1 presents a list of references evaluated regarding ditch losses and irrigation efficiencies, Results have been tabulated into a comparative matrix for canal loss (Table 2), lateral loss (Table 3) and system and farm irrigation efficiencies (Table 4), Data obtained from interviews conducted with the major ditch companies, Bill Howland of the SEO and Don Miles, Extension Irrigation Engineer for Colorado State University at Rocky Ford, Colorado are included in these ,tables, Based on these reviews and interviews the following conclusions and observations regarding ditch losses were made: o Ditch losses depend on many factors including ditch length, depth of flow, channel geometry, groundwater conditions, antecedent ditch conditions, temperature, and sediment concentration of the flow, As presented in Figure 1 the combination of these factors appears to be incorporated in data obtained from interviews with the ditch companies, For exampie: The general trend of Figure 1 demonstrates increased losses with length. Ditches which are furthest from the river such as Lamar, Fort Bent, Las Animas Consolidated and Fort Lyon would be expected to receive little subsurface inflow to compensate for canal seepage and report more loss per mile than canals which have a ditch located upgradient such as the Callin and Buffalo, The Bessemer, which diverted relatively clear water after Pueblo Reservoir was constructed, reported more losses than any other ditch, This high loss has reportedly since been reduced by lining sections of the canal. 2 -