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Project Priority Rating System for Capital
Projects
The priority rating system for
capital construction projects is similar to a cost/benefit ratio system used by the Corps
of Engineers (COE). For ease of use, the priority rating system is divided into
three major categories. These are flooding problems, non-flooding problems and
customer involvement and constructability. Each issue within each category is
assigned a weight or a benefit factor based upon the nature and severity of the problem.
Flooding problems
are assigned a weight based on the type of flooding involved. The main categories
within flooding are: building flooding, outbuilding flooding, street flooding and yard
flooding. The weight for building flooding is based upon water elevations for
building, outbuilding, street and yard flooding are based on information from the COE and
other sources. All flooding factors are adjusted based upon the reduction in the
frequency of flooding as a result of the proposed improvements. For example, if
proposed improvements will not reduce the flooding frequency, the weight would be
multiplied by a frequency adjustment of zero and no rating points would be assigned for
this item. The priority rating points for each flooding type is the product of the
number of problems addressed, the flooding frequency adjustment and the weight assigned
the different flooding types.
Non-Flooding
issues involve standing water, erosion, sedimentation and sanitary inflow problems.
Weights were established for each of these. The priority rating points for each
non-flooding issue is the product of the number of problems solved and their respective
weights.
Customer Involvement and
Constructability Ratings are based on the number of drainage requests resolved,
the number of properties benefited and constructability issues. The weights for
these issues were developed in the same manner as the non-flooding issues. The
constructability priority rating points are the product of the constructability rating and
weight. Constructability ratings can range from zero to five. A
constructability rating of five would indicate that no major problems are associated with
the construction of the proposed project. This basically makes the project more
desirable and increases the benefits associated with the project. The priority
points associated with drainage requests and problems solved are the product of the number
of problems solved and the weighting factor.
The priority rating points for each
major category are totaled and divided by the project construction cost. This
multiplied by 100 yields the project priority rating.
Establishing Priority
Rating Points
Flooding Problems |
| Building
Flooding: |
| First
Floor Flooding |
This is
defined as surface water floodings of the main living or business floor of the building. |
| Basement
Flooding |
This is
defined as surface water flooding in the basement area of a building. Groundwater
related problems are not to be included. |
| Crawlspace
Flooding |
This is
defined as surface water flooding in the crawlspace area of a building. |
| Outbuilding
Flooding |
Outbuildings
include garages, sheds and other buildings not intended for human habitation. |
| Improvements
Flooding |
Improvements
include permanent outdoor additions, pools, patios, etc. |
| Street Flooding: |
| Major
Arterial Road |
This
includes flooding of an interstate type of road. |
| Minor
Arterial Road |
This
includes major road or County Through Road flooding. |
| Primary
Street |
This
includes primary access street flooding. |
| Subdivision
Street |
This
includes local neighborhood type road flooding. |
| Yard
Flooding: |
This is
defined as surface water flooding onto private property. This does not include
flooding of easements or right-of-way. |
Flooding Factors |
| Flooding Frequency Adjustments |
The
frequency adjustment factors were developed to allow partial credit for solutions that
improved, but did not totally eliminate the problems. The adjustments are made based
on the reduction in the frequency of flooding as a result of the proposed improvements.
The frequency adjustment factors shown below shall be applied: |
| Current
Probability of Flooding |
Probability
of Flooding After Project |
Adjustment
Factor |
50%
10%
4%
2%
50%
10%
4%
50%
10%
50% |
1%
1%
1%
1%
2%
2%
2%
4%
4%
10% |
1.00
0.50
0.20
0.10
0.80
0.25
0.10
0.50
0.10
0.25 |
| Damage
Factor |
The damage factor is based upon the amount of damage associated with the specific
problems as a percentage of the typical value of the buildings in the area. The
typical value is calculated by multiplying the typical value per square foot ($70) and the
number of square feet in the buildings. |
Prioritization continued 
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