Other than tree shaped and grid designs, distribution systems are usually laid out in which of the following patterns?
A | Horizontal lines that flow into underground sumps then back into a closed pipe |
B | Horizontal lines flowing into open detention ponds then back into a closed pipe |
C | Vertical designs without backflow prevention devices |
D | Loops and/or circular designs |
Sample test question:
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A required process intended to reduce the level of a contaminant in drinking water.