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

I
I
I
I
I
I
I
I
I
I
I
'.
I
I
.
I
I
I
I

Aoodplain Reference Data5_28_04.xls

Table 2
Ralston Creek
Floodplain Data Table for 10-, 50-, and 500-Year Discharges

Flooding Source lO-yr Floodplain Data 50-yr Floodplain Data 500-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) (NA VD 88) (cfs) (NA VD 88)
198 324+84.28 5455.9 2028 5462.2 3762 5463.5 8125 5465.5
199 331+30.84 5462.2 2028 5466.3 3762 5467.7 8125 5469.1
200 337+82.66 5469.8 2028 5472.9 3762 5473.8 8125 5475.5
201 344+31.33 5476.0 2028 5479.9 3762 5481.0 8125 5482.6
Beech Street 201.5 Bridge Bridge Bridge
202 345+tO.37 5478.0 2028 5481.8 3762 5483.5 8125 5486.1
203 351-H:i0.t5 5482.0 915 5485.8 3004 5487.1 8t59 5489.0
204 357+92.tl 5487.9 915 5490.6 3004 5492.0 8159 5493.6
205 364+29.5 5491.5 915 5495.3 3004 5497.1 8t59 5499.3
206 368+37.01 5496.0 915 55oo.t 3004 5501.7 8t59 5504.3
207 371+39.83 5499.8 915 5503.4 3004 5507.2 8t59 5509.5
Eldridge Street 207.5 Bridge Bridge Bridge
208 372+25.13 5501.0 915 5505.1 3004 5508.2 8t59 5513.6
209 375+21.6t 5501.9 9t5 5506.9 3004 5509.7 8159 5513.7
210 38CH-36.59 5506.0 915 5510.7 3004 5512.8 8159 55t4.9
2tl 387+83.33 5511.7 656 5516.4 30t2 5518.2 8182 5519.9
212 398+52.87 5517.1 656 5520.5 30t2 5522.9 8182 5525.1
213 407->42.06 5522.8 656 5526.6 3012 5528.6 8182 5530.4
214 415-H54.97 5530.0 656 5533.3 30t2 5534.7 8182 5535.4
215 417-H:i5.3t 5531.0 656 5534.1 3012 5535.8 8182 5538.1
Indiana Street 215.5 Bridge Bridge Bridge
216 419+15.34 5531.1 656 5534.6 3012 5538.4 8182 5541.4
217 423-Kl4. 5534.5 525 5539.2 3022 5541.8 8206 5543.3
218 429+34.13 5539.9 525 5543.4 I 3022 5546.1 8206 5547.6
219 43CH-56.t6 5539.6 525 5544.0 3022 5546.4 8206 5549.3
Jovce Street 219.5 Bridge Bridge Bridge
220 431+23.25 5541.5 525 5545.3 3022 5549.6 8206 5551.3
22t 434+36.46 5545.1 525 5548.5 3022 5552.9 8206 5554.4
221.5 437-HJ3.97 5546.4 525 5551.9 3022 5555.8 8206 5558.5
222 442->48.94 5552.7 525 5558.2 3022 5562.5 8206 5564.7
223 445+56.73 5555.0 525 5561.1 3022 5565.8 8206 5569.1
224 446+21.49 5556.0 525 5561.4 3022 5566.1 8206 5569.0
224.5 446+62.96 5566.0 525 5569.5 3022 5571.8 8206 5571.9
225 447+23.33 5567.1 525 5570.7 3022 5573.1 8206 5578.8
. 226 447+63.82 5567.4 525 5571.2 3022 5573.5 8206 5578.9
227 450+41.73 5569.4 314 5571.2 3052 5573.5 8272 5578.9
228 454+70.57 5570.6 314 5571.3 3052 5573.7 8272 5578.9
229 459+54.96 5570.6 314 5573.5 3052 5576.9 8272 5578.9
230 464+15.13 5579.2 314 5582.6 3052 5585.4 8272 5587.0
231 465+45.2 5579.9 314 5583.7 3052 5587.3 8272 5589.0

16

6/2212004