FLOOD04702

• Designation Number: 347
• County: Jefferson
• Community: Unincorporated Jefferson County
• Stream Name: Upper Lena Gulch
• Basin: South Platte
• Title: Flood Hazard Area Delineation - Upper Lena Gulch
• Date: 1/1/1993
• Designation Date: 9/1/1993
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Table 6-3

Floodway Table

Lena Gulch

LOCATION FLOODPLAIN DATA I-FOOT RISE FLOODWAY DATA D.5-FooT RISE FLOODWAY DATA
100-YR DATA 10-YR DATA 50-YR DATA 500-YR DATA DISTANCES LOOKING DOWNSTREAM DISTANCES LOOKING DOWNSTREAM
DIS- THALWEG FLOOD MEAN F.P. DIS' FLOOD DIS' FLOOD DIS' FLOOD HOODWAY WIDTH FLOODWAY MEAN FLOODWAY WIDTH HOODWA Y MEAN
SHT RCH SECT. CHARGE ELEV. ELEV. VEL. WIDTH CHARGE ELEV. CHARGE ELEV. CHARGE ELEV. LEFT RIGHT TOTAL ELEV. VEL. LEFT RIGHT TOTAL ELEV. VEL.
# # # (CFS) (FT) (FT) (FPS) (FT) (CFS) (FT) (CFS) (FT) (CFS) (FT) (FT) (FT) (FT) (FT) (FPS) (FT) eFT) (FT) eFT) (FPS)
7 L-6 312.45 2150 5784.7 5789.8 5.8 760 81D 5787.1 1670 5789.3 5700 5792.1 540 50 590 5790.3 5.5 540 80 620 5790.1 5.1
7 L-6 3t2.50 2150 5784.8 5790.0 3.7 760 810 5787.2 1670 5789.5 5700 5792.4 530 60 590 5790.0 5.6 530 65 595 5790.0 5.0
7 L-6 314.20 2150 5786.8 - . 390 - - - - - - . - * - - - - * - -
7 L-6 316.75 2100 5789.3 5793.4 9.1 760 505 5792.4 1620 5794.7 5700 5798.2 505 -355 150 5797.6 6.4 550 -355 195 5797.3 5.9
40 30 70 5793.4 40 60 100 5793.4
7 L-6 317.12 2100 5789.8 5798.9 5.1 830 505 5798.7 t620 5799.4 5700 5800.4 530 -390 140 5800.7 6.5 575 -390 185 5800.5 5.9
70 40 110 5799.6 70 80 150 5799.3
7 L-6 317.70 2100 5791.0 5799.5 5.6 650 505 5799.1 1620 5800.0 5700 5801.3 510 -370 t40 5801.6 4.7 560 -370 190 5801.3 4.4
85 15 100 5800.3 100 15 115 5799.9
7 L-6 319.13 2100 5797.5 5801.6 6.5 580 505 5800.4 t620 5801.6 5700 5802.7 450 -290 150 5802.4 6.5 495 -290 205 5802.2 5.6
40 40 80 5801.6 45 45 90 5801.6
7 L-6 319.70 2100 5798.8 5804.t 5.5 720 505 5803.7 1620 5804.1 5700 5807.8 430 -290 140 5808.1 5.4 480 -290 190 5807.8 5.9
35 65 too 5804.4 45 65 110 5804.4
7 L-6 325.38 2100 5805.4 5811.3 6.2 780 505 5810.t 1620 5811.3 5700 5812.1 530 .390 140 5812.2 6.2 590 -390 200 5811.7 4.5
140 to 150 5811.3 140 10 150 5811.3
7 L-7 325.93 2100 5806.1 5815.5 3.1 720 775 5814.4 t620 5815.2 5700 5816.6 510 10 520 5815.5 3.5 560 10 570 5815.5 1.7
6 L-7 331.10 2100 5817.1 5823.0 9.7 70 775 5821. 2 t620 5822.5 5700 5825.3 55 15 70 5823.1 9.5 55 t5 70 5823.0 9.5
6 L-7 335.45 2tOO 5826.5 5833.3 6.2 440 775 5832.t 1620 5833.6 5700 5834.3 20 170 190 5834.0 7.3 30 190 220 5833.3 7.9
6 L-7 338.15 2100 5832.2 - - 325 - - - - - - 15 3tO 325 - - 15 310 325 - -
6 L-7 339.78 2100 5836.9 5839.5 8.5 380 475 5839.5 1320 5839.5 5000 5844.1 15 0 t5 5839.9 8.4 15 0 15 5839.9 7.1
.210 360 150 5844.1 -210 360 150 5843.8
6 L-7 347.50 2100 5851.8 5854.2 8.6 470 475 5854.2 1320 5894.2 5000 5862.4 20 -10 10 5854.2 8.5 20 -10 10 5854.2 8.6
-360 450 90 5860.3 .360 450 90 5860.3
5 L.7 351.68 2100 5865.1 5867.0 7.3 550 475 5867.0 1320 5867.0 5000 5870.0 10 10 20 5867.0 7.3 10 10 20 5867.0 7.3
-410 545 135 5868.6 -410 545 135 5868.6
5 L-8 354.32 2100 5872.9 5876.8 6.3 580 475 5876.8 1320 5876.8 5000 5874.0 30 to 40 5876.8 8.8 30 10 40 5876.8 8.0
-305 545 240 5873.3 -305 545 240 5873.3
5 L-8 356.50 2too 5877.1 - - 595 - - . - - - 50 445 495 - - 50 470 520 . -
5 L-8 361.58 2150 5890.9 5893.2 5.9 520 760 5892.6 1675 5893.1 4650 5893.9 10 280 290 5894.0 6.7 10 405 4t5 5893.6 6.2
5 L-8 366.70 2150 5902.7 5905 .9 8.0 300 760 5905.2 1675 5905.7 4650 5906.7 10 160 170 5906.6 7.5 10 205 215 5906.2 7.0
5 L-8 368.85 2150 5907.7 5911.2 6.7 240 760 5910.6 1675 5911. 0 4650 5912.2 10 105 lt5 5911.8 8.4 10 165 175 5911.5 7.4
5 L-8 370.52 2250 5913.5 5918.1 10.9 70 800 5916.t 1700 5917.4 4500 5920.5 10 40 50 5918.7 11.7 10 40 50 5918.3 11.4
5 L-8 371.55 2250 5918.0 5926.3 14.9 20 800 5922.8 1750 5925.1 4500 5931.6 10 tl 21 5926.3 14.8 10 11 21 5926.3 14.9
5 L-9 372.80 2250 5920.0 5928.4 14.7 250 800 5926.2 1750 5927.0 4500 5936.2 10 11 21 5928.5 14.5 10 11 21 5928.5 14.6
5 L-9 373.40 2250 5926.3 5929.2 12.6 100 800 5928.4 1750 5928.9 4500 5936.4 15 15 30 5931.4 9.6 15 40 55 5930.8 9.2
4 L-9 377.32 2250 5934.4 5940.0 10.4 tl0 800 5937.3 t750 5939.t 4500 5942.1 15 15 30 5940.0 12.9 15 15 30 5940.0 9.9
4 L.9 383.35 2250 5945.t 5950.5 13.4 30 800 5947.7 t750 5949.6 4500 5953.9 * 5950.5 13.5 * 5950.5 13.5
4 L.9 384.42 2250 5947.t 5956.6 4.9 30 800 5949.3 1750 5949.6 4500 5958.6 * 5956.6 14.5 * 5956.6 14.5
4 L-l0 388.03 2250 5958.2 5962.6 10.0 70 800 5960.9 1750 5962.1 4500 5964.5 * 5962.6 10.1 * 5962.6 10.1
4 L-l0 388.92 2250 5959.5 5964.2 9.9 70 800 5961.6 1750 5963.4 4500 5967.2 * 5964.2 9.9 * 5964.2 9.9
4 L-l0 392.75 2050 5972.2 5977.5 9.1 70 700 5975 . 7 1590 5977.0 4275 5979.3 15 40 55 5977.5 10.7 15 40 55 5977 . 5 10.7
4 L-tO 396.36 2050 5985.5 5993.0 to.5 100 700 5989.8 1590 5992.0 4275 5995.1 15 20 35 5993.0 12.3 15 20 35 5993.0 12.3

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