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Questions and Answers
What is the primary function of a storm drainage system?
What is the primary function of a storm drainage system?
Which device is specifically designed to collect rainwater from a roof?
Which device is specifically designed to collect rainwater from a roof?
What is the purpose of a catch basin in a storm drainage system?
What is the purpose of a catch basin in a storm drainage system?
What does a junction box do in a storm drainage system?
What does a junction box do in a storm drainage system?
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What kind of drain is used to collect sub-surface water?
What kind of drain is used to collect sub-surface water?
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Which of the following areas is NOT typically drained by a storm drainage system?
Which of the following areas is NOT typically drained by a storm drainage system?
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What is the main material used to construct a sub-soil drainage system?
What is the main material used to construct a sub-soil drainage system?
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What is the purpose of a storm drain pipe?
What is the purpose of a storm drain pipe?
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What is the primary function of a downspout/conductor in a storm drainage system?
What is the primary function of a downspout/conductor in a storm drainage system?
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Which component serves as a connection between the gutter and the downspout?
Which component serves as a connection between the gutter and the downspout?
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What distinguishes a primary drainage system from a secondary drainage system?
What distinguishes a primary drainage system from a secondary drainage system?
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In which locations is a sump (storm water) typically found?
In which locations is a sump (storm water) typically found?
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What is an area drain most commonly used for?
What is an area drain most commonly used for?
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How does a controlled storm drainage system manage storm water?
How does a controlled storm drainage system manage storm water?
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What does the term 'projected roof area' refer to?
What does the term 'projected roof area' refer to?
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What is the minimum slope required toward each roof drain to assure positive drainage?
What is the minimum slope required toward each roof drain to assure positive drainage?
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Which of the following is necessary when designing a roof that will be used as a reservoir?
Which of the following is necessary when designing a roof that will be used as a reservoir?
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In what situation is a secondary drainage system particularly important?
In what situation is a secondary drainage system particularly important?
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What is the primary purpose of installing a stormwater system?
What is the primary purpose of installing a stormwater system?
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Where should downspouts for high-rise buildings be installed?
Where should downspouts for high-rise buildings be installed?
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Which material is NOT typically used for belowground pipes outside a building?
Which material is NOT typically used for belowground pipes outside a building?
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What is the requirement for the number of roof drains in a building over 10,000 sq.ft.?
What is the requirement for the number of roof drains in a building over 10,000 sq.ft.?
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What should be avoided regarding storm drain discharge?
What should be avoided regarding storm drain discharge?
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What is the significance of a '1-percent probability' in stormwater design?
What is the significance of a '1-percent probability' in stormwater design?
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How should exterior storm drains be ideally connected?
How should exterior storm drains be ideally connected?
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Which type of drainage pipe is used for subsoil drainage?
Which type of drainage pipe is used for subsoil drainage?
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Which statement is true about rainwater piping?
Which statement is true about rainwater piping?
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What factors determine the sizing of a stormwater drainage system?
What factors determine the sizing of a stormwater drainage system?
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What type of pipe is typically used for indoor rainwater piping in a medium-height basement?
What type of pipe is typically used for indoor rainwater piping in a medium-height basement?
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What does the statement 'rainfall during a 15-minute period as it may happen once per 100 years' imply?
What does the statement 'rainfall during a 15-minute period as it may happen once per 100 years' imply?
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Which of the following is NOT a characteristic of the materials used for stormwater systems?
Which of the following is NOT a characteristic of the materials used for stormwater systems?
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What causes one side of a pitched roof to intercept more rain than the other side?
What causes one side of a pitched roof to intercept more rain than the other side?
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Which of the following is a permissible material for aboveground rainwater downspouts?
Which of the following is a permissible material for aboveground rainwater downspouts?
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How high must strainers extend above the surface of the roof?
How high must strainers extend above the surface of the roof?
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What is the minimum net inlet area required for dome-type strainers?
What is the minimum net inlet area required for dome-type strainers?
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Which of the following materials is NOT permissible for roof drains?
Which of the following materials is NOT permissible for roof drains?
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What is the minimum total net inlet area required for drains serving sun decks?
What is the minimum total net inlet area required for drains serving sun decks?
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How should a roof drain that passes through the roof into the building be made watertight?
How should a roof drain that passes through the roof into the building be made watertight?
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For low-rise buildings, what is the minimum gauge for galvanized sheet metal used for rainwater conductors?
For low-rise buildings, what is the minimum gauge for galvanized sheet metal used for rainwater conductors?
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Study Notes
Storm Drainage Systems
- A storm drainage system collects, conveys, and discharges rainwater from buildings and sites to disposal points. This includes roofs, courtyards, patios, gardens, and open areas. Parking lots and roadways are also included.
- Roof drains collect water from roofs and convey it to a disposal point via conductors (downspouts).
- Gutters are troughs that collect rainwater from roofs and direct it to leaders.
- Leaders are horizontal components connecting gutters to downspouts.
- Downspouts/conductors are vertical components that convey rainwater.
- Catch basins are box-like devices collecting rainwater from downspouts and ground surfaces.
- Junction boxes connect multiple drainage pipes to one outlet.
- Junction box-area drains are multi-functional, acting as junctions and area drains.
- Storm drain pipes convey rainwater to a suitable disposal system.
- Sub-soil drains collect subsurface water and convey it to disposal points.
- Controlled storm drains, slowly releasing roof water, are a specific system.
- Primary storm drain systems are general use systems.
- Secondary storm drain systems are for heavy storm overflow control, and often involve treatment.
- Sumps, located below gravity systems, receive liquid waste and rainwater.
- Sump pumps remove liquid from sumps.
- Projected roof areas are horizontal components of sloping or pitched roofs.
Roof Drain Materials and Strainers
- Roof drains are typically made of corrosion-resistant materials like cast iron, galvanized iron, copper, or brass.
- Strainers are part of roof drains, extending above the roof surface.
- Dome-type strainers have a minimum inlet area, usually 1.5 times the outlet pipe area.
- Flat-surface strainers on level areas should have a minimum inlet area of 2 times the outlet pipe area.
- Roof drains passing through roofs to interiors should be sealed (watertight) using waterstop rings.
- Roof drain outlets are typically caulked or female-screwed.
Design Principles of Storm Drainage Systems
- Storm drainage systems aim to quickly convey rainwater away from buildings to keep surfaces dry.
- System sizing is based on rainfall rates rather than total rainfall.
- Rainfall rates vary by intensity and frequency of occurrence.
- Storm drainage design should account for code-mandated primary and secondary systems for heavy rainfall.
- Secondary systems provide overflow control.
- Drainage should be towards areas with lower elevation.
General Storm Drainage System Installation Guidelines
- Storm drains should not discharge into septic tanks or sanitary sewers except in designated storm sewer lines.
- Rainwater piping should not be used for other waste and vent piping.
- Rainwater piping in vulnerable locations should be protected.
- Used roof drains and piping should be tested and approved according to local codes.
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Description
This quiz explores the components and functions of storm drainage systems, including roof drains, gutters, leaders, and catch basins. Understand how these elements work together to collect and manage rainwater from various surfaces. Test your knowledge on the key features and terminology related to storm drainage systems.
