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where complete streamflow information was needed, but only for periods long enough to relate the flow characteristics within a specified accuracy to those at nearby primary stations. From the relations thus established, long-term flow characteristics at the secondary station site were to be estimated from the long-term characteristics at one or more primary- station sites. Of the 130 secondary stations in the 1957 plan, 75 were in basins exceeding 100 sq mi in area. In 1960 a revised plan was proposed to collect only partial-record data at these larger basins and to estab- lish 55 secondary stations in basins from 10 to 70 sq mi in area. Appendix I shows the progress that has been made to date in implementing the 1957 and 1960 plans. Partial-Record Stations The 1957 plan proposed to convert the secondary stations to partial- record stations after the secondary phase had reached the selected defini- tion of monthly flow. Partial-record stations included both high-flow partial-record and low-flow partial-record stations, and were defined as stations to obtain, respectively, the annual peak discharge and the factors of base flow. In addition to the partial-record stations in the program, carried out in cooperation with the Water Resources Board, the U.S. Geological Survey, in cooperation with the State Highway Commission of Kansas, currently main- tains records of annual peak discharges at 96 to 100 basins in Kansas with drainage areas of less than 75 sq mi. Fourteen of these stations are equip- ped with stage and rainfall recorders. Also the U.S. Geological Survey, In cooperation with the Kansas State Board of Agriculture, maintains records for 65 low-flow partial-record stations. The latter program is scheduled to end in fiscal year 1970. Appendix 2 shows an inventory of the high-flow and low-flow partial- record stations. The locations of the stations are shown on figure 2, except where sites are too closely ~paced to be shown separately. FRAMEWORK OF rHIS STUDY The principal concept of this study is that streamflow Information may be needed at any point on any stream in Kansas, and that the program must be designed to accommodate this need. This information can be provided by a combination of data collection and hydrologic studies that generalize the data obtained at gaging sites. This concept is similar to the one pre- viously used, but statistical techniques now allow greater flexibility. Another important concept is that the goals of the program, Including accuracy goals, should be specifically Identified. Identification of the 4