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INTRODUCTION

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REFERENCE

Hydrology Reports for Water Crossings - MTO Hydrology Requirement Checklist

Guide for Preparing

Hydrology Reports for Water Crossings

MTO Hydrology Requirement Checklist

The checklists presented below provide a comprehensive list of documentation requirements to be included in a Hydrology Report submitted to MTO. It is the responsibility of the designer to determine the applicability of the documentation requirements listed to the design being considered. The selection should be based on the suitability of the tasks to each particular design proposal, and the scale and nature of the proposed project.

Download for printing: MTO Hydrology Requirement Checklists (PDF - 241 KB)

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These checklists should be used to:

  • Identify the tasks that are relevant to the project.
  • Ensure that the relevant tasks have been considered, addressed and documented in the Hydrology Report; and
  • Provide comments that summarise findings, considerations and any other issues that need to be highlighted. Justification for excluding tasks should be provided in the checklist summary and in the body of the Hydrology Report if their exclusion is not for obvious reasons.

Checklist 1: MTO Approvals

  Issue Applicability to This Project Is it Documented Comments
Determine the
Requirement
for
Hydrology
Report 		The level of planning and design being addressed in the report.
The rationale for preparing the report and who initiated the study.
The number and locations of the watercourse crossings being considered.
Reference to other Reports associated with this watercourse crossing.
Approval
Requirements 		Acquire MTO Approvals for:
  • The design criteria
  • Deviations for CHBDC, if applicable
  • Preliminary Hydrology Report and
  • Detailed Hydrology Report.

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Checklist 2: Collecting Background Information

  Issue Applicability to This Project Is it Documented Comments
Review
Previous
Drainage
Studies 		Review and reference watershed, subwatershed or master drainage plans.
Review and reference MTO Environmental Study Reports.
Review and reference other drainage studies such as:
  • Flood Damage Reduction Program Study (FDRP)
  • Erosion Control Study
  • Flood Control Study
  • Other:____________
Conformance to previous highway studies (e.g. preliminary design reports).
Identify Data Needs and Availability Identify data needs and and how much of the data is available.
Identify
Characteristics of the
Watercourse 		Identify the physical characteristics of the watercourse.
Identify the history of flooding.
Identify
On -Site
Conditions 		Complete a site inspection at the proposed water crossing sites and collect required data and information.
Identify site constraints.
 
Identify
Requirements of Other
Agencies 		Identify regulatory fish habitat requirements from:
Identifying regulatory flood line requirements from:
  • Conservation Authority
  • Others:___________
Identify approval requirements of other agencies.

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Checklist 3: Identifying Drainage Issues

  Issue Applicability to This Project Is it Documented Comments
Identify
Existing
Drainage
Problems 		Identify existing drainage problems on upstream and downstream riparian property.
Identify
Issues
with Other Structures
Upstream
and
Downstream 		Identify if there are bridge or culvert structures upstream or downstream including their configuration and distance from the proposed structure.
Identify existing drainage problems of other bridge structures upstream or downstream.
Identify impact of the other structures on the design criteria for the crossing being considered.
Investigate
Stability
of the
Watercourse 		Identify the geomorphic stability of the stream at the proposed crossing location.
Establish the design criteria that would address for the conditions of the watercourse at the proposed crossing location.
  • Location of the crossing
  • Location of piers and abutments
  • How the major flow will be addressed (pass through the structure, overtop the approach or overtop the structure)
  • Depth of the foundation
  • Requirements for watercourse training works
  • Requirements for channel armouring
Criteria
that
Regulate
the
Watercourse 		Identify upstream and downstream water level controls.
Identify flow controls upstream and downstream.
Identify
Design
Alternatives 		Identify the different possible alternatives for crossing such as different locations, different configurations, spans or height of structure and different types of structure (bridge or culvert).

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Checklist 4: Performing the Hydraulic Design

  Issue Applicability to This Project Is it Documented Comments
Develop
the Design
Criteria 		Develop the design criteria for the proposed structure based on collected data, MTO standards, policies, guidelines and manuals and the CHBDC.
Acquire approvals for the proposed design criteria and modify design criteria if necessary.
Conduct the
Hydrologic
Analysis 		Perform the hydrologic analysis, or verify existing analysis, to determine the design, check and regulatory flow rates using appropriate stream gauge station. Perform frequency analysis on stream flow data for 2, 10, 25, 50, 100-year return periods.
Perform the hydrologic analysis, or verify available analysis, to determine the design, check and regulatory flow rates applying alternative runoff simulation methods based on precipitation and watershed characteristic data for (2, 10, 25, 50, 100-year return periods). Document results of the analysis (as per the MTO online web page "Evaluation of Drainage Management Software").
Design
the Bridge
or Culvert
Opening 		Perform the hydraulic analysis to size the bridge or culvert opening(s).
Conduct water surface profile calculations, or verify existing analysis, to determine backwater and assess the impacts upstream and downstream. (An appropriate number of stream cross sections must be selected and defined for an accurate assessment of the water surface profile.)
  • Identify downstream/upstream reference point
  • Perform analysis
  • Document results of the analysis (as per the MTO online web Page "Evaluation of Drainage Management Software")
Determine flow velocities for all storm events modelled.
Analyse
Scour and
Determining
the Depth
of Footings 		Perform the analysis to ensure the level of scour will not jeopardise the structural integrity of the bridge or culvert crossing.
Determine the appropriate depth of footing for the piers and abutments.
Design for
Ice and
Debris 		Determine the requirement for conveying ice and debris flow and avoiding ice jams.
Design to
Convey
the
Regulatory
Storm 		Identify the High Water Level, flood plane and flow path for the Regulatory flow event.
Identify if the post development extreme event will flow over the approach, over the structure or through the structure.
Determine the depth of flow:
  • at the approach and
  • over the structure.
Identify design features that will allow the structure to withstand additional forces due to overtopping, if applicable.

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Checklist 5: Mitigating Impacts to the Drainage System

  Issue Applicability to This Project Is it Documented Comments
Designing
Erosion
Protection
Measures 		Provide scour and erosion control measures at the location of the crossing as well as, upstream and downstream if necessary.
Design
Fish Habitat
Protection
Measures 		Design fish habitat protection measures.
  • Select the appropriate type of measures
  • Ensure flow velocities are suitable for migration of fish species
  • Ensure hydraulic suitability of proposed measures
  • Address any impact upstream and downstream
Address
Impacts
on Lands
and Structures
Determine the impact on surrounding lands and structures and develop solution to address these impacts, if feasible.
Determine the impact on the highway and develop solution to address impact, if feasible.
Determine the requirements for compensation to affected structures or lands, if applicable.

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Checklist 6: Finalizing Design and Construction Issues

Issue Applicability to This Project Is it Documented Comments
Design Bridge Deck Drainage.
 
Complete the Requirements for Erosion and Sediment Control During Construction.
Recommending the Best Alternative.
 

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