FLOOD02803 - Laserfiche WebLink

Home Browse Search

Hydraulic Analysis of Proposed Conditions 6 . 0.062 will be replaced with 0.050, based on the calculation in the previous section. Referring to the HEC-2 results of the Baker Engineers study see 'Existing Conditions Simulation Output', page 19, the only two changes made to this data are the following: 77a78 > NC .050 89c:90 < He 0.055 0.055 > He 0.055 0.055 0.062 The above nomenclature describes the differences to the two files. The first difference is that there is a new line #78 which is NC .050 The next difference is a change to the old line #89 (now line #90 because of the above inserted line) which now reads He 0.055 0.055 0.062 An arrow at the beginning of a line which points to the left refers to the original file, and a right . pointing arrow refers to th,~ changed file. The first of the above changes reflect a new value for Manning's In' (for the channel) at cross section #139690 of 0.05. Remember, there is no overbank area for this cross section. The second change resets the channel roughness back to a value of 0.062. A summary of the simulation results is shown in table 1 (for more detailed information, see 'Modified Roughness Simulation Output', page 31). ~L"rQU , .t;futll~ Water .J-'ropOj~t! W~ter Difference J?fuhn9 f,roposed Difference Section Surface levation Surface Elevation Velocity Velocity 129630 4758.3 4- 758.9 0 ~,9 ~,9 0 130980 4-759.9 4759.9 0 6.' 6.' 0 132030 4761.8 4761.8 0 1,6 1,6 0 133300 ~76',~ ~ 763.~ 0 9,1 9,1 0 136~50 ~ 767,4 ~ 767~ 0 1.6 1,6 0 139690 4769.9 4769.8 .0.1 '.7 ',9 0.' 145160 4774.9 .4.174.9 0 1,6 1,6 0 147200 4 777.~ 4177.3 .0.1 8,9 9,0 0.1 14-8950 4780.4 4- 780.4- 0 6,' 6,' 0 148960 4780.6 4- 780. 6 0 5,0 5,0 0 149580 4781.3 .4.181.3 0 ',9 ',9 0 151100 4782.9 4782.9 0 7,0 7.0 0 152250 ..pas.:? 4785.2 0 7.3 7,' 0 152300 4785.5 4785.5 0 q 6.~ 0 152340 4787.5 4787.5 0 '.1 '.1 0 152390 787.5 787.5 0 3.1 3.1 0 . Table 1. Modified Roughness Simulation Summary