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would be subject to radical changts. Several stations on principal streams already have or soon will have mor~ than 25 years of record and could then be discontinued. Most stations on natural streams having drainage art~as of 150 to 500 (1,000) sq mi could be discontinued. Many stations for areas smaller than 150 SQ mi could be discontinued or reduced to high-flow partial-record operations. Many of these changes, however, are prevented by needs for flow data for other purposes at particular sites. Many sta- tions are needed to provide current information for use in management of the water resources. Records of streamflow are needed at many chemical- Quality and sediment stations in the State. A few stations are required for other special needs. Although the gaging station progrum is not subject to radical revi- sion, certain modifications appear to be desirable. Deficiencies in the streamflow program have been identified and some gaging stations have served their primary purpo~e according to the criteria used in this report. A proposed streamflow program for Kansas is presented in this report. The design of the program is based on the results of the study described herein, and recognizes the need for different types of data in planning, design, and operation of water-related facilities and activities. The proposed program includes both uata collection and hydrologic studies that are necessary to regional ize information on streamflow. Full advantage is also taken of partial-record operation. ~hen only certain characteristics, such as low fl~~ or reak flow, are needed at a site, cost can be substantially reduced hy partial-record operation. The relative costs for different type.; of st.Jtions, considering the annual cost of operation and spreading the initial cost of installation over the expected I ife. are shown below. Each COSl is expressed as a percentage of the cost of a complete-record SliHion. Stat ion Percent of cos t Complete record Hiqh-flow partial-record Low-flow partial-record 100 15 5 The six elements of the proposed orogra~ are described below: I. Complete-record stations In '1etworl..s addition to the current-purpose stations shown in table 3. four of complete-record ga-;Jing stilt ions sl10uld be operated as foIIO\~s: (1) Stations on unregulated minor stream~ for conditions not covered by the regression eqUations, shawn on figure 7. (2) Stations on unregulated principal streams, shown on figure 8. 36