BOOK 29 Truck Operations Manual- WATER UTILITIES Flashcards
The City of Los Angeles uses a combination system to supply an average of ___ million gallons of water per day to 4 million people.
600 million
Where does the city of LA receive its water from and what percentage from each location?
75% from two aqueducts from the Sierra Nevada.
15% from wells within the San Fernando Valley.
10% from the Metropolitan Water District (MWD) which supplies water from the Colorado River and State Water Project (Sacramento and Feather Rivers).
Trunk lines carry water from a primary source (reservoirs, pumps, etc.) to mains within a distribution system. Trunk lines can vary from ___ inches to ___ feet in size, and are constructed from iron or concrete.
36” to 10ft in size
Mains normally run beneath a street and parallel to a curb, can vary from ___ to ___ inches in size, and are constructed from iron pipe.
2” to 72”
Water is delivered to individual structures by a combination of service and customer lines. Service lines run between a main and a water meter, can vary from ___ inch to ___ inches, and are constructed from iron, copper, or galvanized pipe.
1/2” to 12”
Customer lines run between a water meter and a structure, can vary from ___ inch to ___ inches, and are constructed from iron, copper, galvanized, or plastic pipe.
1/2” to 12”
What 2 types of valves are commonly utilized for shut off valves?
Indicating
Non- indicating
Water meters are normally directly adjacent to shut-off valves and vary in size from ___ to ___ inches (inlet-outlet size).
1/2 - 10”
Compound meters are ___ inches or larger and are normally found directly adjacent to shut-off valves.
4”
Detector Check Valve with By-Pass Meter. Used to supply water for a closed fire protection system. Detector check valves can vary in size from ___ to ___ inches.
2 - 10”
