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15 Cards in this Set
- Front
- Back
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1. A collection system must consider the population served 50 years into the future. |
b. false A collection system must consider the population served for 20-25 years. It is its Structural Life that must be 50 years. |
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b. false The first step is to define the area to be served. |
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3. Sewer use ordinances protect wastewater systems from injurious industrial waste. |
a. true |
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4. Velocity requirements are optional for a gravity wastewater system. |
b. false Velocity requirements are NOT optional! The minimum velocity to keep transported solids in suspension is 2 feet per second (fps), however 3 fps is recommended |
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5. The minimum velocity required to keep wastewater solids in suspension is 2 fps. |
a. true
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6. Grade, gpm, trench depth, pipe diameter and material affect flow velocity. |
b. false Not Trench Depth... But Grade, GPM, Pipe Diameter, A Pipe's C-factor rating (interior wall smoothness) CAN affect flow velocity. |
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7. C-factor is a pipe’s coefficient of cost. |
b. false A Pipe's C-factor rating, is its interior wall smoothness. The higher the rating, the smoother the walls. |
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8. The smallest pipe diameter allowed for a city gravity main is 6 inches. |
a. true |
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9. Some of the primary components of a collection system are pipe, cleanouts, grease traps, sand traps, inverted siphons, vent pipes, manholes and ________. |
b. lift stations
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10. A lateral connects a house service line to a city ________. |
c. main
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11. The line that carries wastewater to treatment is called the ________ line. |
d. outfall
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12. A cleanout is designed for inserting a ________ tool, not for personnel entry. |
a. cleaning
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13. Cities should require ________ in kitchens, garages and restaurants. |
d. grease traps
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14. Cities should require ________ at car washes. |
a. sand traps |
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15. A/An ________ allows a wastewater line to cross below the hydraulic gradient. |
d. inverted siphons |
