wastewater collection

Question 1

3 basic defense mechanisms to combat wasterwater diseases

Answer 1

sanitation
innoculation
isolation

Question 2

2 factors that influence design of collection system

Answer 2

topography

wastewater flow

Question 3

effects of high velocity flow in pipes

Answer 3

odor and corrosion

Question 4

effects of low velocity in pipe

Answer 4

settling of solids

Question 5

factors for pipe sizing

Answer 5

volume of wastewater

relative peak flow

Question 6

maximum daily flow

Answer 6

2x

Question 7

maximum hourly flow

Answer 7

3 to 4x

Question 8

minimum daily flow

Answer 8

2/3

Question 9

minimum hourly flow

Answer 9

1/3

Question 10

pipe slope for residential 4 inch

Answer 10

2%

Question 11

pipe slope for residential 6 inch

Answer 11

1%

Question 12

pipe sizing for low pressure collection systems using holding tanks

Answer 12

1 -1.5

Question 13

wastewater in gravity collection systems is carried from the building through a small diameter gravity sewer pipe to the sewer main in the street

Answer 13

service connections

Question 14

service connection discharge wastewater into gravity flow, pipes cannot be less than 8 inches

Answer 14

lateral and branch sewer mains

Question 15

main sewer connect to larger mains 8-12 inches

Answer 15

trunk sewers

Question 16

trunk sewer discharges into

Answer 16

wastewater treatment system

Question 17

3 main part of low pressure collection system

Answer 17

valve
cleanout
air release system

Question 18

flow lift station equipped to handle

Answer 18

maximum peak hour flow

Question 19

spacing for small manhole

Answer 19

120m or 400ft

Question 20

spacing for large manholes

Answer 20

150m or 500ft

Question 21

diameter for manhole barrell

Answer 21

42-48 inch

Question 22

frequency on manhole inspection

Answer 22

once annually

Question 23

prevents wastewater from dropping on worker

Answer 23

drop manhole

Question 24

inflow or surface water and groundwater infiltration can cause the system to be hydraulically overloaded resulting in

Answer 24

surcharging resulting in flooded basements

Question 25

methods to detect inflitration

Answer 25

visual smoke dye cctv

Question 26

methods to detect exfiltration

Answer 26

cctv | smoke

Question 27

direction to pull cctv

Answer 27

direction of flow, downstream

Question 28

smoke test to determine

Answer 28

``` illegal connection lost manhole broken sewer connection to residents source of surface flow ```

Question 29

dye test to determine

Answer 29

illegal connections

Question 30

water table for smoke test

Answer 30

low

Question 31

lamping determines

Answer 31

pipe grading

Question 32

pumping frequency at lift station

Answer 32

20 mins

Question 33

electric motors are limited to how many stars

Answer 33

6 to8

Question 34

shreds debris and organic matter as wastewater passes through the rotating cutting edges

Answer 34

communutors / barminutors

Question 35

wastewater velocity must be greater than .6m/sec aka

Answer 35

scouring velocity

Question 36

frequency of isolation valve inspection

Answer 36

annually