DESIGN CONSTRAINTS
Costs:
Brief discussion of factors that affect the initial
investment: e.g. materials, allowances, excavation, erosion
control, etc. It may be applicable to mention how a small
initial cost could lead to a larger long term cost
- Direct benefits to be obtained from the drain
Flows:
Qualitative description of flows that are expected
throughout the year, how they affect the design of the
channel and the structures
- Amount of investigation, the limitations and the findings
Potential effect on
construction and future maintenance
Erodability
Protective measures necessary to preserve drain stability
i.e. grade control, interceptor drains, riprap, etc.
- Location and description of the outlet for the drainage
works
Sensitivity of drain to
outlet changes (e.g., beaver dams)
Sufficiency of outlet (possible effects of drainage
improvements on peak flows into the outlet of the project)
Identify any special requirements for construction
(e.g. work to be done after freeze-up, requirement for pads
for hoe, tow-dozers, specialized equipment requirements,
etc.)
- Describe any effect that the project may have on water
quality
- Effect on Ground Water Supply:
- Describe any effect that the project may have on
groundwater
- Effect on Fish and Wildlife:
- Describe any effects and fish and/or wildlife
- Potential Permit Requirements:
- Give a summary of the concerns expressed by environmental
agencies and how they were addressed in the design, as well
as the additional permits that may be required.
- Potential Crop Damages Due to Construction
RECOMMENDATION AND ALTERNATIVES
- Provide a detailed description of the work to be performed
as part of this project, including references to the plan,
profiles and specifications. Consider providing a summary of
the work to be performed on each affected landowner.
- Road Crossings: [S. 17] "The engineer...shall provide
for...any bridges or culverts... rendered necessary by the
drainage works crossing any public road or part
thereof."
- Other structures: [S. 18] "...the
engineer...shall provide for...bridges, culverts, pumping
stations and water gates rendered necessary by the drainage
works..."
- Provisions to reduce maintenance costs: sediment basins,
grade control structures, rip rap, seeding, fencing,
alternate water supply, landowner actions or practices that
could preserve the drain.
- Abandonment: [S. 19] "The engineer...may recommend
the abandonment of any drain or part thereof that is no
longer useful or that is being supplanted by a new drainage
works." If this is not done, the old drain still
legally exists and the municipality could be required to
maintain or repair it.
- Benchmarks: [S. 13(1)] "The engineer...shall
establish sufficient bench marks or permanent levels...and
shall in the report record the description, location and
elevation of every bench mark or permanent level."
- Disposal of Materials: [S. 16] "The engineer in the
report shall determine in what manner the material taken
from any drainage works in the construction, improvement,
repair or maintenance thereof shall be disposed of."
This should be clearly stated so that the landowner
understands how it will affect his or her land.
- Working Space: [S. 63(1)] "The contractor...when
engaged in...a drainage works may, with their equipment,
enter upon whatever lands are necessary to complete the work
within the working space designated in the engineers
report." The report should clearly define the working
area and any access requirements. It should also indicate
that this working space or right-of-way exists for as long
as the drain exists and that the landowner should keep it
clear of obstructions so that it can be used for future
maintenance/repair work.
- Reference to Design and Construction Guidelines
- Give a brief description of all alternatives considered
and the reason why the recommended solution was chosen.
- Future extensions to provide outlet for other parcels
- Deepen to provide tile drainage outlet
- Indicate the criteria used in designing the project
- Provide a qualitative description of the performance of
the drain during low flows and during 2-year or 5-year event
- Future Maintenance/Repair:
- Type of work that may be expected and who is responsible
for the work
- Methods to reduce frequency of maintenance/repair work
- Instructions on assessing costs (maintenance/repair
assessment schedule)
- Total costs: [S. 8(1b)] "A report ...shall include
... an estimate of the total cost..."
- Work within different municipalities: [S.. 27]
"...the engineer shall estimate separately the cost of
the drainage works within each municipality..."
- Among other things, the estimate of the cost of the
drainage works could include materials, construction,
allowances, engineering, contingency funds, the cost of
applications, references and appeals and the cost of
temporary financing.
- Costs not to be included in a drainage works:
- [S. 73(2)] "The cost of council meetings and
special council meetings shall not be included in the
cost of the drainage works."
- [S. 73(3)] "The council...may...provide for
payment to the clerk...but such fees or other
remuneration shall not be deemed to form part of the
cost of the drainage works"
- [S. 93(1)] "...council...may provide for fees or
other remuneration for...the drainage
superintendent...but such fees or other remuneration
shall not be deemed to form part of the cost of the
drainage works..."
- Should indicate that these costs are estimates only; final
costs will be determined when the project is tendered and
constructed.
- [S. 29] "The engineer...shall estimate and allow in
money to the owner of any land that it is necessary to
use..."
[S. 30] "The
engineer shall determine the amount to be paid to persons
entitled thereto for damages, if any..."
May also provide allowances for existing drains (s. 31),
insufficient outlet (s. 32) or for loss of access (s. 33)
A summary description of
the types of allowances should be provided in the report (or
reference to an appendix containing the summary)
Report should list separately the allowances being paid, if
any, to landowners under each of these sections.
Where allowances are being provided for a working area or
right-of-way, should consider indicating that the right-of-way
will exist for as long as the drain exists, and will be used
for future maintenance and repair work; the landowner will not
be entitled to further damages.
- A summary description of the assessment types should be
provided in the report (or reference to an appendix
containing the summary)
- Assessment Schedules: [S. 21] "The engineer in the
report shall assess for benefit, outlet liability and
injurying liability, and shall insert in an assessment
schedule, in separate columns, the sums assessed for each
parcel of land and road liable therefor." Further
information on these types of assessments are provided in
Sections 22 and 23. There should be correlation between the
property identifiers on the plan with those on the
assessment schedule.
- Special Benefit: [S. 24] "The engineer may assess for
special benefit any lands for which special benefits have
been provided by the drainage works."
- Special Assessment: [S. 26] "...the public utility or
road authority shall be assessed for and shall pay all the
increase in cost of such drainage works caused by the
existence of the works of the public utility or road
authority." This is a non-prorateable assessment since
this section indicates that the public utility or road
authority shall pay all the increase in cost.
- Number of Hectares: [S.36] "The engineer...shall
show... the approximate number of hectares affected by the
drainage works in each parcel of land assessed..."
Affected municipalities:
[S. 37] "The engineer...shall list separately the lands in
each municipality assessed for a drainage works..."
Lateral Drains: [S. 37] "The engineer...shall indicate
the assessment for the cost of lateral drains..."
Non-agricultural land: [S. 37] "The engineer...shall
indicate...the assessments of lands that are not agricultural
lands."
- Maintenance/Repair Assessment Schedule:
- Maintenance/repair schedules: [S. 38] "...the
engineer shall determine and report the basis upon which the
cost of maintenance and repair of the drainage works or of
any part or parts thereof shall be assessed." The
engineer should work with the drainage superintendent that
the maintenance/repair assessment schedule is in a format
suitable to the superintendent.
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