Subdivision Planning/Design Part 3: Storm Sewers TSYH 4535

Upon successful completion, the student will be able to:

Module 1 - Introduction to Municipal Storm Drainage Systems

• Define the hydrological cycle and correlate this with topographical features.
• Recognize the different types of municipal drainage facilities.
• Incorporate a drainage system corridor within a municipal road allowance.
• Create a right-of-way for municipal sewers on private property.

Module 2 - Planning Procedures and Master Drainage Plans

• Identify and select a method of analyzing storm water runoff that may be part of a storm water management program.
• Refer to and utilize master drainage plans.
• Differentiate between major and minor drainage concepts.
• Determine the extent and depth of information required for the design project.

Module 3 - Basic Storm Sewer Structures

• Determine the location and types of manholes and junction chambers.
• Recognize and specify different types of inlet and outlet structures.
• Select and specify a suitable sewer pipe material.

Module 4 - Catchment Area Plans and Lot Grading Techniques

• Determine the overall catchment area for a storm sewer system.
• Prepare a lot grading plan for a new residential subdivision.
• Prepare a schematic layout of the proposed storm sewers.
• Establish the sub-catchment areas for each branch of the storm sewer system.

Module 5 - Quantity of Storm Sewer

• Interpret the appropriate rainfall data for the design and compute the time of concentration.
• Select a runoff coefficient suitable for the catchment area.
• Apply the Rational Method for estimate of runoff.
• Refer to other methods of runoff determination.
• Be conversant with the concepts of detention/retention.

Module 6 - Selection of Storm Sewer Size

• Select the appropriate friction factor and flow formula.
• Determine the sewer size and ensure that scouring velocities are achieved.
• Recognize non-uniform flow problems associated with bends, inlets, junctions and energy dissipators.

Module 7 - Tabulation of Design Data

• Tabulate your design computations in a recognized format.
• Modify your design table to suit specific needs.
• Summarize your design in a report form.

Module 8 - Preparation of the Plan and Profile

• State and define the basic preparation required and organization of a set of project drawings.
• Adopt a legend, prepare specific details and incorporate standard notes.
• State specific information that should be shown on the plan and profile drawings.

Module 9 - Structural Requirements

• Determine the loads on sewers due to earth and superimposed forces.
• Establish the supporting strength of rigid and flexible pipes.
• Incorporate a factor of safety, review design relationships and examine charts for determining earth loads on buried conduits.

Module 10 - Construction Methods

• Establish the construction survey requirements for preliminary layouts and setting line and grade.
• Describe open trench construction procedures involving excavation, shoring, dewatering and backfilling.
• Outline special considerations required for construction across special structures such as railroads, streams and traffic arterials.
• Prepare 'as-constructed' records of the installed works.

Effective as of Fall 2003