ENFORCE29946

• Permit No: M1978052
• IBM Index Class Name: Enforcement
• Doc Date: 12/4/2001
• Doc Name: FAX TRANSMITTAL
• From: LIDSTONE & ASSOCIATES INC
• To: DMG
• Media Type: D
• Archive: No

Attachment A: HEC-RAS Analysis
South Platte River Reach from Cross Section 30 through 33
HEC-RAS Output
11 /30/2001
River Sta Q Total Min Ch EI W.S. Elev E.G. Elev E.G.Slope Vel Chnl Flow Area To Width Froude # Chl
(cfs) (ft) (ft) (ft) (fVft) (ft/s) (sq ft) (ft) (ft)

30 2000 5013.0 5016.33 5016.46 0.001000 2.92 685.33 212.14 0.29
30 4000 5013.0 5018.03 5018.26 0.001000 3.80 1052.56 218.37 0.31
30 6000 5013.0 5019.41 5019.71 0.001001 4.42 1356.06 223.39 0.32
30 8000 5013.0 5020.66 5021.03 0.001000 4.87 1641.92 233.67 0.32
30 10000 5013.0 5021.83 5022.25 0.001002 5.20 1921.49 247.86 0.33
30.5 2000 5016.0 5021.26 5021.41 0.001060 3.14 636.43 184.81 0.30
30.5 4000 5016.0 5023.17 5023.41 0.001154 3.91 1023.55 228.13 0.33
30.5 6000 5016.0 5024.56 5024.86 0.001155 4.39 1365.95 255.25 0.33
30.5 8000 5016.0 5025.71 5026.07 0.001100 4.82 1660.33 259.82 0.34
30.5 10000 5016.0 5026.76 5027.18 0.001053 5.16 1936.84 264.04 0.34
31 2000 5031.6 5032.79 5033.23 0.016822 5.88 433.27 469.84 0.99
31 4000 5031.6 5033.32 5034.01 0.016628 7.42 693.01 503.53 1.04
31 6000 5031.6 5033.78 5034.63 0.015654 8.35 929.21 532.32 1.05
31 8000 5031.6 5034.15 5035.17 0.015330 9.19 1134.81 576.05 1.07
31 10000 5031.6 5034.53 5035.66 0.014214 9.77 1361.88 647.72 1.05
32 2000 5028.8 5035.82 5035.95 0.000620 2.97 687.91 159.98 0.24
32 4000 5028.8 5037.51 5037.77 0.000923 4.17 1104.95 331.26 0.30
32 6000 5028.8 5038.55 5038.93 0.001116 5.08 1465.57 360.20 0.34
32 8000 5028.8 5038.83 5039.13 0.001040 5.03 2360.86 535.59 0.33
32 10000 5028.8 5039.47 5039.83 0.001133 5.55 2705.38 540.00 0.35
33 2000 5029.5 5036.42 5036.45 0.000170 1.40 1628.84 881.08 0.12
33 4000 5029.5 5038.25 5038.28 0.000144 1.62 3559.65 1169.62 0.12
33 6000 5029.5 5038.99 5038.99 0.000006 0.36 28421.49 4831.30 0.02
33 8000 5029.5 5039.20 5039.21 0.000009 0.46 29440.77 4832.98 0.03
33 10000 5029.5 5039.91 5039.91 0.000010 0.51 32843.57 4840.42 0.03
Note: The levee at x-sect 32 overtops at flows greater than 6,000 cfs but less than 8,000 cfs.