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The effects of three historical droughts on multiple-use and waterquality minimum streamflows available for instream use on the lower Neosho River were investigated. Multiple-use minimum streamflows were recommended by the Kansas Water Office, and water-quality minimum streamflows were recommended by the Kansas Department of Health and Environment. Natural streamflows that occurred during the droughts of water years 1933-36, 1953-57, and 1963 were compared to the multiple-use and water-quality minimum streamflows at the streamflow-gaging stations located near lola and Parsons, Kansas. To simulate the effects of John Redmond Reservoir, streamflows that occurred during the three droughts at the Strawn gaging station were first routed through the reservoir using a reservoir-routing model and then routed downstream to the lola and Parsons gages using a streamflowrouting model. The simulated regulated-condition streamflows at the lola and Parsons streamflow-gaging stations then were compared to the multipleuse and water-quality minimum streamflows. At the lola gage, the regulated streamflows usually satisfied the recommended multiple-use streamflows with smaller volume deficiencies as compared to the natural streamflows. At the Parsons gage, the natural streamflows satisfied the recommended multiple-use streamflows more frequently and with smaller volume deficiencies as compared to the regulated streamflows. The larger volume deficients for the regulated streamflows were attributed to the reservoir-operating procedure in the reservoir model. At the lola gage, the regulated streamflows satisfied the recommended water-quality streamflows more frequently as compared to the natural streamflows. At the Parsons gage, the natural streamflows satisfied the recommended water-quality streamflows more frequently but with larger volume deficiencies as compared to the regulated streamflows. Frequency analysis made on the natural streamflows and on regulated streamflows showed that regulated streamflows reduced the number of days with low flows (less than 20 cubic feet per second) and high flows (more than 100 cubic feet per second). The reduction in days of flows of less than 20 cubic feet per second aided the achievement of both the recommended multiple-use and water-quality streamflows. The reservoir-routing model was used to determine if the natural streamflows that occurred during the three historic droughts would maintain sufficient storage in John Redmond Reservoir that could be used to satisfy the recommended multiple-use and water-quality streamflows at both the lola and Parsons gages. The reservoir was assumed to be full (maximum conservation pool) before inflow began. Only during the 1950's drought was storage insufficient to maintain the multiple-use streamflows at the Parsons gage. The additional storage needed was estimated to be 15,400 acre-feet.

Availability of natural and regulated streamflows for instream uses during historical droughts, lower Neosho River, southeastern Kansas