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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The cost for a comprehensive river channelization is presented in
Appendix C. This work is necessary because of the current poor
condition of the rivers, which will continue to cause substantial
annual damage to public and private improvements if not
addressed. The assumptions and methodologies of this cost
estimate are applied first to the entire length of the river (Case
1) and then to the most critical areas identified in field
inspections (Case 2). For this range of channelization work,
costs are $8,000,000, for specific critical reaches, to
$17,200,500 for channelization of the entire Uncompahgre, Gunnison
and North Fork of the Gunnison Rivers as they pass through Delta
County. The following table itemizes the cost per river for the
Case 2 example:

RIVER CHANNELIZATION
ESTIMATES
CRITICAL AREAS

Uncompahgre River
North Fork of the

$ 720,000
$2,040,000
$3,780,000

$6,540,000

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gunnison River ..............

Gunnison River ................................

Total Construction Cost .......................

Engineering, Surveys and Legal ........~....... $ 200,000

Contingencies (20%) ........................... $1,260,000

Total cost for river training
protect private improvements

to ..............

$8,000,000

Cost estimates for channelization
jetty construction and other
techniques. ;,!! (.:' A/eLl,,!
/ vl Y'-'"

could possibly
cost effective
2,'(le,^'.(..'~" c'2.

be reduced by
flood control

NO ACTION - COST ESTIMATE OF FUTURE PUBLIC AND PRIVATE FLOOD
DAMAGES IF NO RIVER CHANNEL IMpROVEMENTS ARE MADE

Normally, the average cost of future flooding would be calculated
by finding the sum of the costs of the average yearly damage that
would be caused by floods of ever decreasing frequency. This
would be done using an inventory of all buildings and private
structures, all public structures such as water and sewer
treatment plants, parks and recreation areas, farmground and
crops, and any other improvements within the known area of
flooding - in this case the 100 year floodplain.

so

The average annual cost of flooding analysis is very applicable in
predicting the cost of flooding over the long term. However, for
near future and in circumstances where "average" conditions do not
exist, as in this case where extremely high amounts of debris and
gravel bars choke the channel, the "average" method cannot
accurately predict the near future flooding damage with reasonabl~y\~'

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