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<br /> I <br /> 4. MODEl PARAMETERS (Cont'd) <br />5. J,xplain how reach lengths for channel and overbanks were determined: I <br /> Lengths were taken from new digitized aerial mapp ing based on field surveyed I <br /> control. <br /> I <br /> I <br /> s. RESULTS (from model used to revise 100-year wilter surface elevarions) <br />1. Do the results indicate: I <br /> a. Water surface elevations higher than end points of cross sections? .... .... !Xl Yes 0 No I <br /> b. SupercriticaJ depth? ... ........ . . . . . . . . . . , . ... ........ ..... ............... 0 Yes I1lJ No <br /> c. Critical depth? ..... ............. 0 Yes IX] No <br /> d. Other unique situations 0 Yes IZI No I <br /> If yes to any oflhc above, attach an explanation lhat discusses the situation and how it is presented on the I <br /> profiles, tables. and maps. Original 1979 F Uill mapp ing was utilized where Floodplain <br /> width exceeded cross sections taken from new aer ial mapping. <br />2. What is the maximum change in energy gradient between cross-sections? 1. 05 I <br /> Specify location 25999 <br /> ................. ............ <br />3. What is the dislan"e between the cross-sections in 2 above? ........ .......... 210 I <br /> Specify location 25739 to 25999 <br /> .............. <br />4. What is thc maximum distance betwccn cross-sections? ... 610 feet <br /> cross sec'C:i..on I <br /> Specify location 29190 to 29800 <br />5. Jo'loodway determination <br /> a. What is the maximum surcharge allowed by the community or State? ........ 1.0 foot I <br /> u. What is the maximum surcharge for the revised conditions? 1.0 foot <br /> Spe"ify location ........................ 28755 I <br /> c. What is the maximum velocity? IJ.03 fps <br /> ..... ........... <br /> Spe"ify location ....... ..... .. ...... ...... .... .... ............. Section 26034 I <br /> High velocity encountered only at Ash Avenue bridge outlet. Remainder <br />I~xplain: <br /> of river has velocity of 7 fps and less I <br /> d. Arc there any ncgeative surcharge values at any cross-section I1lJ Yes 0 No I <br /> (fyes.the t100dway may need to widen. (fit is not widened, please explain and indicate the maximum negative <br /> surcharge. At two locations, 26114 and 26787 the surcharge is - 0.1 foot. At there I <br /> Doints the channel is confined between high banks. The floodway connot be widened <br /> at these locations <br /> Riverine Hydraulic AnalYSIS Form Form4 Page4 of 6 I <br />