FLOOD05149

• County: Delta
• Community: Delta
• Stream Name: Gunnison, Uncompahgre Rivers
• Basin: Gunnison
• Title: Cost Estimates for Removal of Debris, Bank Protection and River Training Along the Uncompahgre, Gunnison and the North Fork of the Gunnison Rivers
• Date: 1/1/1980
• Prepared For: Delta County
• Prepared By: Mt Highland Engineering
• Floodplain - Doc Type: Miscellaneous

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width and depth of channel to maintain a 100 year flood of 21,200
cfs above the City of Delta and 24,700 cfs below the City of Delta
at the average slope (from Mannings Formula).

Upstream of Delta Downstream of Delta
Channel Channel Channel Channel
Depth Width Depth width
8 430 11 307
10 308 13 238
12 232 15 192

Comparison of cross sections at
an average of 56 cubic yards per
where the channel is clogged with

each
foot
sand

depth of reaches along river,
must be moved in reaches
and gravel bars.

Comparative Costs

Case 1 If the entire reach was channeled to fit the above
applicable cross section:

66,250 ft x 56 yd3jft = 3,710,000 yd3
3,710,000 yd3 x $3jyd3 =

$11,130,000

Case 2 - Based on the field surveys
channel only has to be cleared
protect specific critical areas:

and aerial photographs the
in certain reaches in order to

15,000 ft of heavy clearing
15" 000 ft of light clearing
15,000 ft x 56 yd3jft = 840,000 yd3
15,000 ft x 28 yd3jft = 420,000 yd3
1,260,000 yd3

1,260,000 yd3 x $3jyd3

$ 3,780,000

North Fork of the Gunnison River

Length - 76,275 feet - The center line length of the North
the Gunnison River from a point 13,000 feet below the
Bridge at the Town of Hotchkiss to the 4175 Road Bridge
of the Town of paonia.

Fork of
3400 road
upstream

Flow - 11,300 cfs - 100 year flood flow at the Town of paonia
below the confluence with Minnesota Creek.
- 12,200 cfs - 100 year flood flow above the Town of
Hotchkiss.
- 12,800 cfs - 100 year flood flow below Leroux Creek

Roughness Coefficient - 0.040 - 0.070 - main channel
- 0.040 - 0.110 - overbank

C-5

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