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

  • Soil Conditions:
    • 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.
  • Outlet of the Project:
    • 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)
  • Construction Equipment:

– 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.)

  • Effect on Water Quality:
    • 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

  • Recommended Solution:
    • 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 engineer’s 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
  • Alternatives Considered:
    • Give a brief description of all alternatives considered and the reason why the recommended solution was chosen.
  • Construction Scheduling:
    • Anticipated pattern
    • Overall time requirement
  • Other Potential Work:
    • Future extensions to provide outlet for other parcels
    • Deepen to provide tile drainage outlet
  • Design Criteria:
    • 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)
  • Cost Estimate:
    • 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.
  • Schedule of Allowances:
    • [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.
  • Schedule of Assessments:
    • 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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