In stark contrast to the relatively homogeneous behavior of the 22 STAs, the 15 entries in the lake and reservoir database indicate a wide range of behavior. The four periods studied for Lake Okeechobee have HRTs in the range of 580 to 715 days. At the other extreme, four entries have reported HRTs of less than 10 days. Mean depths range from 4.1 to 11.2 feet. The estimated HRT range for the EAASR was 67 to 107 days with a mean depth of 5.9 feet. Thus, the possible Lake/Reservoir comparable in Table 4-6 can be reduced to George, Istokpoga, Harney, Jessup, Crescent, and Thonotosassa with regard to quantity characteristics. More detailed analysis of reservoir comparable will be presented in the next section on water quality.