HomeMy Public PortalAboutExhibit MSD 70P - Prioritization Worksheet Guidelines 1
Prioritization Worksheet -- Guidelines for Use
October 10, 2006
General
The new prioritization worksheet is three pages long.
Enter the project name and date at the top of each page (it is automatically carried
to pages 2 and 3 if using electronically).
The worksheet is separated into “Problem Categories” and “Solution Categories”
Assigning Problem Points (pages 1-2)
Using information collected in the field and from complaint records, determine which of
the two main Problem Categories the investigated problem falls under.
If the source of the problem is a stream, use Category 1.0 on the first page to
assign the “Problem points”.
If the source of the problem is overland flow or inadequate/non-existent storm
sewers, turn to Category 2.0 on the second page to assign the “Problem points”.
Category 1.0 (page1)
Category 1.0 is subdivided into 1.1 Flooding and 1.2 Erosion. If the project only deals
with one of these types of problems, go directly to that subcategory and then evaluate
each line in light of the problem identified. If the project deals with both types of
problems, complete Section 1.1 and Section 1.2.
Every line on this page utilizes three levels of severity to assign points (except line 1.2.2).
For structure and roadway flooding, the minimum frequency of storm (2-, 15- or
100-year) causing the problem should be computed or estimated. The number of
lots affected is then entered under that storm heading.
For erosion, field measurements should be made to determine the ratio of height
of eroded bank divided by distance from nearest structure. The number of lots
affected should be entered to the right of the points shown for the appropriate
ratio.
Category 2.0 (page 2)
Category 2.0 is used for flooding problems caused by overland flow or inadequate/non-
existent storm sewer systems.
Category 2.1 utilizes the same three levels of severity as Category 1.1, and the
storm frequency should be computed or estimated in the same way.
Erosion caused by overland flow is included as either as 2.2 “moderate risk
erosion of miscellaneous structures” or 2.3 “yard erosion”.
Category 2.4 can be used to assign additional points to a problem if the age of the
existing system is greater than 25 years. Using the approximate system age, enter
the number of points indicated in the space below the corresponding age range.
2
Additional things to note under Problem Points:
Include the address(es) of lots that are assigned points on the line provided under
each subcategory.
The total problem points from pages 1 and 2 are automatically summed at the
bottom of page 2 and included in the total benefit points sum at the bottom of
page 3 (if entered electronically).
Categories 3-5: Assigning Solution Points (page 3)
After filling out either page 1 or page 2, turn to page 3 to determine if any of the Solution
Points can be applied. These points are given to projects whose solution achieves the
benefits described in Categories 3-5.
Category 3.1, reduction of flowrate leaving the site, would most commonly be
achieved by the addition of a detention feature. The pre- and post-project peak
flowrates are computed to determine the percent of reduction. This percent is
then multiplied by 1000 to obtain the total points awarded. This should only be
used where the approximate reduction can be reliably estimated at the preliminary
stage.
Category 3.2 points can by applied when a proposed solution combines several
smaller projects (that are not immediately adjacent to one another) into a
watershed or subwatershed solution. Enter the number of total projects combined
less one: for example, if 3 projects are combined, enter 2 as the number of
additional projects.
Category 4.1 points can be applied if the proposed solution includes any of the
water quality features listed. These should only be used if the user has confidence
that the feature will not be dropped during final design. For linear treatments,
divide the total proposed length by 100 LF to obtain the number of units. For
treatment areas, enter the number of acres. Round all quantities to the nearest
whole number.
Category 4.2 points can be applied if the project eliminates a combined sewer
system. A non-regional solution would get 100 points, while a regional solution
could get 100 points per project that eliminates a combined sewer system.
Category 4.3, which addresses inflow into the sanitary system, can be applied
where the proposed solution would eliminate the inflow. The total number of
locations eliminated is entered by the user.
Category 5.1 assigns points for projects with fewer easements. The user’s best
estimate of the number of easements that will be required is used to determine
how many points can be awarded. The user must enter the number of points (20,
10 or 5 points) appropriate for the number of easements estimated.
3
Category 5.2 allows the user to enter 100 points if the proposed solution will
include recreational or educational benefits to the public.
Cost/Benefit Ratio
When all Problem and Solution Points are assigned, the total benefit points will be
summed automatically (if entered electronically).
Divide the cost estimate for the project by 1,000 and enter it in the worksheet
where indicated.
The cost/benefit ratio will be automatically computed (if entered electronically).
Project Designation
At the bottom of page 3, indicate whether the project is likely to be performed by MSD or
by others. This is normally dictated by MSD’s policy, which outlines the District’s
maintenance responsibility and defines what constitutes the MSD system. However, if
the project is to be funded by OMCI funds, other types of projects are sometimes
included (e.g. culvert replacement).