A plumbing contractor needs to install a water service line in Michigan. What is the minimum depth required for the water service line to prevent freezing?
Correct Answer
C) 6 feet
In Michigan, water service lines must be installed at least 6 feet deep to be below the frost line and prevent freezing during winter months.
Why This Is the Correct Answer
Michigan's frost depth requires water service lines to be buried at least 6 feet below grade. This depth places the pipe below the frost line in Michigan's climate, preventing freezing during harsh winter months.
Why the Other Options Are Wrong
Option A: 5 feet
5 feet is not sufficient for Michigan's frost depth. While 5 feet may be adequate in milder climates, Michigan's severe winters require the additional depth of 6 feet to protect water lines.
Option B: 4 feet
4 feet is well above the frost line in Michigan and would result in frozen and burst pipes during winter. This depth is appropriate only in southern states with minimal frost penetration.
Option D: 3 feet
3 feet is far too shallow for Michigan and would result in certain freeze damage. This depth might be found in states like Florida or Texas where frost is rarely a concern.
Memory Technique
Michigan = 6 feet. Think 'M' for Michigan and 'M' for Maximum frost depth. Six feet is also about the height of a tall person — imagine burying the pipe deep enough to hide a standing person underground to keep it from freezing.
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