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

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

Comparison of cross sections at each depth of reaches along
an average of 10 cubic yards per foot must be moved in
where the flow is impaired by sand and gravel bars.

river,
reaches

Comparative Costs

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

49,800 ft x 10 yd3/ft = 498,000 yd3
498,000 yd3 x $3/yd3 =

$ 1,494,000

Case 2
channel
protect

Based on the field surveys and
only has to be cleared in certain
specific critical areas:

aerial photographs the
reaches in order to

20,000 ft of heavy clearing
8,000 ft of light clearing
20,000 ft x 10 yd3/ft = 200,000 yd3
8,000 ft x 5 yd3/ft = 40,000 yd3
240,000 yd3
240,000 yd3 x $3/yd3 = $ 720,000

Gunnison River

Length 66,250
river from a point
mouth of the canyon

feet The center line length
11,000 feet below the G-50 Road
above the unincorporated Town or

of the Gunnison
Bridge to the
Austin.

Flow - 21,200 cfs - 100 year flood flow above the City of Delta.
- 24,700 cfs - 100 year flood flow below confluence with the
Uncompahgre River.

Roughness Coefficient 0.032 - 0.050 - main channel
- 0.040 - 0.100 - overbank

Average Slope - 0.17% - average from a point 11,000 feet below the
G-50 Road Bridge to the mouth of the canyon above the
unincorporated Town of Austin.

Depth of 100 year flood from centerline of channel -

Above City of Delta 8 to 13 feet
Below Uncompahgre River confluence - 11 to 15 feet

C-4