Annual flow duration Volume of water which is equalled or exceeded for 95,90,75,70,50,25, and 10 percent of the time, based on mean daily discharges. Contributing drainage area The effective drainage area of a basin with closed or otherwise non-contributing areas deleted. Drainage area The area determined above a specified location, measured in a horizontal plane enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into the stream above a specified point. Forest area Percent of drainage basin which is forested. Measured by the grid sampling method. Inches per year of runoff Shows the average depth to which the drainage area would be covered if all the runoff for each year were uniformly distributed on it. Latitude and longitude Location of gaged sites in degree, minutes, and seconds. Low-flow discharges Minimum discharges which are not exceeded for 1,3,7,14,30 and 90-day periods for 2,5,10, and 20-year frequencies. Main channel length Channel length, in miles, measured from gage to basin divide. Main channel slope Drop in elevation along course of a river channel computed by the 85 to 10 percent method (Benson, 1962). Maximum mean daily discharge Volume of water which is equalled or exceeded for 3,7,15, 30 and 90-day periods for 2,5,10,20,25,50 and 100-year frequencies. Mean annual precipitation Average yearly precipitation for drainage basin. Mean basin elevation Average basin elevation in feet above sea level, from topographic maps by the transparent grid method. Mean discharge The mean annual daily discharge for period of record. Monthly mean discharge Average discharge for each month of year of period of record. Gaged sites below reservoirs are for record prior to regulation. Peak discharge Volume of water which is equalled or exceeded for the recurrence interval of 2,5,10,25,50, and 100-years, as defined by U.S. Water Resources Council, "Guidelines for determining flood flow frequency." Period of record Period of time for which a gaged site has been operated. Twenty-four hour rainfall Volume of precipitation in inches which is equalled or exceeded during a 24-hour period at a frequency interval of 2,10,25,50, and 100 years.

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Approximate locations of the long-term rainfall station, evaporation stations, and the rural streamflow-gaging stations in Kentucky and Indiana, used in the study...... 7 Contents III 3-7. Graphs showing: 3. Comparison of observed and simulated peak discharges at selected sites and all sites combined for storms used in calibrations of the Rainfall-Runoff Model (RRM)

This report describes the results of an analysis of the effectiveness of the streamflow-gaging network in Kentucky in providing regional streamflow information. The data available for analysis included streamflow-gaging stations in Kentucky and selected stations in adjacent States. One phase of the analysis determined the increased effectiveness of the network if hypothetical new stations were added. The analysis was based on the principles of generalized least squares regression. Regional regression equations were developed and the regression coefficients were estimated by considering the time-sampling error in streamflow characteristics and the cross-correlation between stations. The average variance of prediction consists of model error and sampling error. Each gaging station in the network was then evaluated on the basis of how much the data from that station affected the sampling-error component of the regression equations. The potential effects of data from proposed new gaging stations on the samplingerror component of the regression equations also was evaluated.