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<br />o <br />\:....' <br />tn <br /> <br />General information on irrigation system characteristics for sprinkler irrigation such as size <br />~. and spacing of sprinkler heads, pressure and discharge ranges used, and for flood irrigation <br />such as number and spacing of contour ditches was obtained. Irrigators were asked whether <br />conservation measures such as land levelling or smoothing, tailwater collection and reuse, or <br />cutback or surgef/ow irrigation have been implemented. Information regarding the methods <br />employed by individuals for scheduling irrigation was obtained. . <br /> <br />Each respondent was asked whether they had an interest in working with the SCS to develop <br />on-farm irrigation management and planning techniques such as irrigation scheduling or <br />improving application methods. In addition, each respondent was asked whether they had a <br />preference for an additional supply of late or early season irrigation water, <br /> <br />Aerial photographs of the study area were used to identify individual parcels of irrigated land. <br />Each respondent was asked to identify his or her irrigated land on the aerial photographs and <br />the outline of the land parcel was drawn directly on the photograph. The township, range, <br />and section in which each parcel was located was then recorded on the questionnaire. <br /> <br />In order to identify soil types and characteristics associated with each land parcel, parcel <br />boundaries were marked on a second set of aerial photographs annotated with soil mapping <br />unit numbers as identified by the SCS during development of soil surveys. The soil mapping <br />unit number for each irrigator's land parcel(s) was identified and the associated soil <br />characteristics obtained from unpublished soil surveys for the study area. Soil characteristics <br />obtained from the soil surveys include: <br /> <br />o Depth in inches <br />o Soil texture <br />o Clay content <br />o Estimated porosity <br />o Total available water in inches <br />o Available water capacity in inches per inch <br />o Hydrologic soil group <br /> <br />Missing Data <br /> <br />The purpose of the irrigator interviews was to obtain as much information as possible from <br />shareowners and irrigators regarding the actual practices employed in the study area, <br />Individuals interviewed supplied varying levels of detail and completeness of information. No <br />attempt was made, as part of the data collection task, to estimate missing data not obtained <br />through the interview process, Missing data will be obtained or estimated for subsequent <br />work during development of recommended operating plans for the two ditch companies. <br /> <br />Database Development <br /> <br />A database of information obtained from the interview process was developed using DBASE <br />III Plus software. Information from the questionnaires was entered directly into the database <br />and database indexes were built to allow easy sorting, Compiling the data gathered from the <br />interviews into a computer database allows easy manipulation of the information for <br />computing statistics, generating summary tables, and updating as new information is <br />obtained, An explanation of the column headings in each of the tables in this report is given <br />in the glossary in Appendix A at the end of the report. <br /> <br />2 <br />