Drafting from greater than 10' of lift will cause the rated capacity of the pump to _____.

When drafting water from a lift greater than 10 feet, the rated capacity of the pump will decrease due to the limitations of the pump's performance regarding atmospheric pressure and the physics of lifting water.

As the lift increases, the pump must work harder to overcome the gravitational pull on the water, and this increased effort can lead to a reduction in the volume of water that the pump can effectively move. This is because a pump's ability to maintain suction decreases as the height of lift increases; hence, moving water from a greater vertical distance takes away from the pump's efficiency and lowers its effective output.

In practical terms, if a pump is rated for a certain flow rate at a nominal lift, increasing that lift beyond the recommended thresholds will not only strain the pump but may lead to cavitation, where vapor bubbles form due to low pressure, causing further inefficiencies and potential damage to the pump. Thus, drafting from greater than 10 feet means that the pump operates beyond its optimal performance levels, resulting in a decreased rated capacity.