WSP06362

• File Number: 8210.470
• Description: Pacific Southwest Interagency Committee
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 11/1/1971
• Author: PSIAC
• Title: Pacific Southwest Analytical Summary Report on Water and Land Resources based on Framework Studies of Four Regions - November 1971
• Water Supply Pro - Doc Type: Report/Study

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Some of these measures help serve the need for
increased space for recreation and improvement of
the environment and esthetic quality of urban areas.
Participation by communities and developers in Title
XII National Insurance Development Program of the
Housing and Urban DevelopmentAct of 1968 (public
Law 90-448) should result in the increased use of
nonstructural measures.

Costs

The flood control installation costs are shown in
figure 22. Costs are divided between Federal and
non.Federal, based on existing laws and policies.
Figure 23 shows the estimated annual operation,
maintenance, and replacement cost at the end of the
time frame for facilities put into operation during
that time frame.

Un met Needs

Prevention of all flood damage is an unrealistic
goal. A reasonably high degree of flood protection is

2000

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1965-
1980

1980-
2000

2000-
2020

Figure 22.-Flood control installation cost.

Flood Control

provided in the plans for the four regions of the
Pacific Southwest. The remaining damages, both
urban and non-urban, would not be concentrated so
flood damage prevention measures would not be
practical. The total residual (unmet) flood damages
of the four regions in 1965 dollars are shown on
flgure 24.

Alternatives

No alternative to the selecte<l mix of flood control
meaSUres is presented. Each of the described measures
to reduce flood damage complements the other, and
can be used singly or in combination. Existing data
and the judgment of experienced planners with
specialized knowledge of the study areas were utilized
to arrive at the mix of the various measures presented
in each of the four regional reports. Countless other
combinations are possible, but more detailed studies
of economic, environmental, and other considerations
are required to determine which measure or
combination of m~asures should be used at specific
locations.

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Figure 23.-Flood control operation, maintenance,
and replacement costs.

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