What is the main reason a sprinkler system supplied by a gravity tank fails?

A sprinkler system supplied by a gravity tank may primarily fail due to not having enough water in the tank. The gravity-fed system relies on the gravitational pull to deliver water to the sprinkler heads. If the water level in the tank is insufficient, the system will not be able to function properly, as there won't be adequate pressurization or volume to effectively distribute water to the areas that need to be irrigated.

In a gravity system, the water must be at a certain height to generate the necessary pressure for effective operation. When the water level drops below this requirement, it jeopardizes the entire system's ability to provide sufficient coverage and can lead to dry zones in the area being serviced.

While factors like incorrect installation, pipe leakage, and mechanical failure of pumps can contribute to issues within a sprinkler system, the fundamental problem with a gravity-fed system is fundamentally tied to the availability of water in the tank. Without adequate water, the entire system is compromised, regardless of other components being in good working order.