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•' -.i <br />■ r. ' r <br />Elevations for floods of the selected recurrence intervals on Lake <br />Minnetonka. Chevy Chase Area Ponds E and F, carman Bay Area Ponds G <br />and H. and Ponds East of the French Lake Area Ponds A. B. C. and 0 <br />are shown in Ted>le 2. <br />Table 2. Summary of Elevations <br />Elevation (Feet NGVD)Flooding Source <br />and Location <br />Lake Minnetonka <br />At Orono <br />Pond E <br />Chevy Chase Area <br />Pond F <br />Chevy Chase Area <br />1 G — <br />n Bay Area <br />Pond H <br />Carman Bay Area <br />Ponds A and B <br />East of the French Lake <br />Area ■ <br />Pond C <br />East of the French Lake <br />Area <br />Pond 0 <br />East of the French Lake <br />Area <br />10-Year 50-Ycar 100-Year 500-Year <br />930.0 930.6 930.9 931.3 <br />963.0 963.6 963.7 <br />% <br />963.8 <br />960.0 960.4 960.5 960.8 <br />914. a 935.3 935.5 935.7 <br />934.2 934.4 934.5 934.7 <br />930.0 930.6 930.9 931.3 <br />930.0 930.7 931.0 931.4 <br />930.1 930.9 931.2 931.7 <br />All elevations are referenced to the National Geodetic Vertical <br />Datum of 1929 (NGVD). Elevation reference marks used in the study <br />are shovm on the maps. <br />3.2 Hydraulic Analyses <br />Analyses of the hydraulic characteristics of the lakes and the <br />stream in the community were carried out to provide estimates of the <br />elevations of floods of the selected recurrence intervals around <br />each lake and the stream studied in the community. <br />The water-surface elevations for the selected recurrence intervals <br />for tKe UnnasMd Tributary to Stubb's Bay were computed utilising the <br />U.S. Army Corps of Bngineers* HBC-2 step-backwater computer program <br />(Reference 14). <br />Photogranmetric met)tods were used to obtain data for the dry portions <br />of the cross sections. Data for those portions of the cross sec­ <br />tions underwater as well as the dimensions and elevations of <br />»•8 <br />II <br />1 <br />4 <br />--