F2 - Describe Sumps, Catch Basins & Septic Tank - LT #6 Flashcards
Trapping hoods in sumps are installed to:
Prevent solid debris from entering the outlet.
Backwater valves are required in certain locations. Which of the following is one of them?
Between a sump and the main storm sewer.
What is a private sewage disposal sytem?
Septic system, used in areas outside of municipalities.
How does a septic system typically work?
Has a holding tank, used to separate solids from liquids and allow bacterial action to break down and neutralize solid matter.
Liquids from the distribution box of septic direct liquid waste into:
Various pipes that make up the absorption field.
What is an absorption field?
Trenches in which perforated pipe and drain rock are placed to disperse the liquid from the holding tank to the soil that it will absorb.
When is a sewage pump used for a septic system?
Gravity cannot be used to move liquid sewage from the building to the septic tank.
What is greywater?
Grey waste water,
Greywaste water system installed in addition to a septic system:
In addition to a septic system
What is a oil-water seperator?
Used in catch basins for parking areas, fueling stations and industrial areas.
Use gravity to allow water to flow through the middle layer, with heavy solids dropping to the bottom and the oil rising to the top.
What is a backwater valve?
In-line valve that allows movement of liquid in only one direction. Known as a backflow prevention valve or a one-way check valve.
Backwater valve is normally installed between a sump and the main storm sewer.
Absorption field shall not be located:
1) Under roadway
2) Under a paved area or slab
3) Under an area used by or intended for parking motor vehicles.
What is a cistern tank?
Like a rain barrel but larger, can be above or below ground. Water from a cistern may be used outdoors for irrigating as well as for indoor use.
When is a sewage pump installed?
Pump is installed when gravity cannot move liquid sewage from the building septic or from the septic absorption field. Pump installed in basement.
When is a grease trap required?
Restaruaunt and food prep. facilities. High levels of greater can plug up sewer pipes, hard on septic systems. Require regular pumping and cleaning.
