FLOOD06450

• Designation Number: 92
• County: Jefferson
• Community: Arvada
• Stream Name: Ralston, Leyden Creeks
• Basin: South Platte
• Title: Major Drainageway Planning - Ralston/Leyden Creek, Arvada, Jefferson County, CO
• Date: 8/1/1977
• Designation Date: 1/1/1978
• Floodplain - Doc Type: Floodplain Report/Masterplan

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VI-4

TABLE VI-3
PHASE A
PROBABLE ANNUAL DAMAGES
RALSTON CREEK",
Channel Status Quo
Design w/Select Closed Nonstructural
Frequency Improvements Grass-lined European Concrete-lined Conduit Strateg'y
2 $ 317,100 $ 220,000 NA NA NA
10 298,000 31,500 NA NA Nfl
100 294,600 0........ NA NA NA $ 255,000
....
2 753,400 940,000 $ 940,000 NA NA
10 281,100 124,200 124,200 NA NA
100 261,500 0.'0', 0."* NA NA 260,000
2 1 , 302, 1 00 1,200,000 1,220,000 $ 1,220,000 $860,000
10 1,146,200 181,400 181,400 181,400 104,000
100 1,082,000 0.1..0" 0"-"- Q.'d: O*,\- 1 ,040,000
"" "..
2 475,000 429,200 429,200 NA NA
10 395,000 67,100 67,100 NA NA
100 320,000 0-"'" O.c NA NA 285,000
"" "
2 900 NA NA NA NA
10 900 NA NA NA NA
100 900 NA NA NA NA 700

Reach

2

3

4

5

.c Annual damages are estimated only for those alternatives investigated in particular reach.

** Damages in 100-year channels are considered under 0 & M.