Development of the System Wide Model (SWM) for the Metropolitan Sewer District (MSD) of Greater Cincinnati involves use of rainfall estimates for calibration and validation of the model and operationally, in real-time. The WSR-88D radar network deployed by the National Weather Service and other agencies in the US provides a valuable source of archived and real-time estimates of rainfall. This paper describes the approaches used in evaluation of the data produced by the radar facilities. Three categories of characteristics were examined: 1) NEXRAD facility characteristics and operations, 2) equi-distant storm total comparison, and 3) storm total accumulations over the MSD. Because of proximity, the facilities of most interest are radar installations at Indianapolis, Indiana (KIND), Cincinnati, Ohio (KILN), and Louisville, Kentucky (KLVX). The results reported demonstrate the need for review of the radar facilities and the data characteristics resulting from each installation before use in sewer system modeling studies. The intercomparison study of the radar facilities reveals striking differences and important characteristics affecting subsequent use in system-wide sewer modeling.