FLOOD08569

• Designation Number: 574
• County: Jefferson
• Community: Arvada
• Stream Name: Ralston Creek and Leyden Creek
• Basin: South Platte
• Title: FHAD - Ralston Creek and Leyden Creek
• Date: 6/1/2004
• Prepared For: Douglas County, Arvada
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Floodplain Reference: Data5_28_04.xls

Table 4
Leyden Creek
Floodplain Data Table for 10-,50, and 500- Year Discharges

Flooding Source lO-yr Floodplain Data SO-yr Floodplain Data SOO-yr Floodplain Data
Thalweg Elevation Discharge Flood Elevation Discharge Flood Elevation Discharge Flood Elevation
Identification Cross Section Station (NA VD 88) (cfs) (NA VD 88) (cfs) (NAVD 88) (cfs) (NA VD 88)
Upstream of Ralston Creek Confluence 500 3+74.92 5665.6 933 5421.5 1994 5423.2 3252 5424.9
501 10+81.85 5424.0 933 5428.5 t994 5429.2 3252 5429.3
Sinuns Street 502 15+42.21 5427.3 933 5432.5 1994 5433.2 3252 5433.2
503 16Hl3.22 5427.8 933 5432.8 1994 5433.9 3252 5434.5
504 21+IO.lt 5431.4 933 5436.7 1994 5437.6 3252 5437.8
504.5 24+13.39 5434.0 933 5438.0 \994 5439.4 3252 5439.8
W. nnd Avenue 505 28+42.95 5436.0 933 5440.7 1994 5442.2 3252 5442.6
506 29+20.95 5436.8 933 5443.t 1994 5445.4 3252 5444.7
507 32+76.14 5438.0 832 5443.1 t792 5445.t 2876 5444.t
508 37+91.38 5441.8 832 5446.8 t792 5449.2 2876 5449.4
509 44+95.33 5440.0 832 5448.4 1792 5450.1 2876 5450.4
5tO 50+32.14 5452.0 568 5453.9 1251 5454.6 2247 5455.3
5lt 57+91.78 5456.5 568 5459.6 125\ 5460.3 2247 5460.3
511.5 63+83.39 5460.0 391 5461.9 842 5461.8 2247 5463.4
512 70+27.21 5463.3 391 5464.5 842 5465.7 2247 5467.2
W. 75th Place 513 76+35.97 5466.4 391 5469.0 842 5469.4 2247 5470.5
514 78-tOO.98 5466.0 39t 5473.0 842 5473.9 2247 5474.0
5t4.5 84+42.74 5472.6 391 5473.2 842 5474.3 2247 5475.3
515 89-Hl7.63 5474.5 391 5477.1 842 5477.2 2247 5478.3
516 94+71.81 5480.0 391 5484.0 842 5485.2 2247 5486.6
517 95+50.32 5480.7 391 5485.1 842 5486.6 2247 5487.2
517.5 99+ 15.94 5485.0 391 5486.5 842 5487.8 2247 5489.8
Alkire Street 518 105+30.25 5487.7 391 5490.8 842 5492.6 2247 5494.3
519 105+92.86 5488.0 39t 5494.5 842 5494.8 2247 5495.1
520 ltO-Hl8.90 5493.8 134 5494.9 148 5495.0 2247 5497.8
520.25 112+46.5\ 5495.0 134 5497.2 148 5497.2 2247 5500.9
520.75 120+48.62 5498.7 134 5500.8 148 5500.9 2247 5504.2
52t 125+46.32 5501.5 134 5503.3 148 5503.4 2247 5507.4
521.25 \29+ 10.15 5506.0 134 5507.5 148 5507.6 2247 5512.5
521.75 133-Hl5.45 5508.6 134 5510.7 148 5510.8 2247 55\4.6
522 t40+54.69 5517.0 \34 5517.6 t48 5517.6 2247 5519.7
522.5 145+85.54 5520.6 134 5522.0 \48 5522.0 2247 5524.2
523 151+18.01 5529.2 134 5530.4 148 5530.4 2247 5532.5
524 155+82.10 5536.0 134 5536.7 148 5536.7 2247 5537.9
525 162-Hl7.97 5538.8 \34 5540.6 148 5540.7 2247 5544.\
525.5 167+56.46 5545.4 134 5546.t 148 5546.1 2247 5548.0
526 t7t+47.oo 5550.0 134 5551.t 148 5551.t 2247 5553.0
Croke Canal 527 175-Hl3.30 5552.3 134 5554.9 t48 5555.0 2247 5557.7
528 176+19.79 5553.1 134 5560.4 148 5562.6 2247 5562.2
Indiana Street 529 177+18.45 5553.5 134 5560.4 148 5562.6 2247 5562.2
530 177+85.05 5554.8 134 5563.9 \48 5564.6 2247 5565.5
531 180+66.88 5561.7 134 5563.8 148 5564.5 2247 5567.6

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6f22J2004