Final answer:
Low pressure drainage systems use devices that apply negative pressure to enhance water flow. These systems create a pressure difference that lowers hydraulic pressure and speeds up drainage.
Step-by-step explanation:
The features of low pressure drainage systems involve devices that are designed to increase the flow rate of water through the sink draining process. The device works by applying negative pressure to one side of the drain system. This creates lower atmospheric pressure on that side, effectively lowering the hydraulic pressure (often referred to as Up in physics equations), leading to water moving towards the side where the negative pressure was applied. By facilitating the movement of water using this pressure difference, the flow rate through the sink drain is significantly increased, allowing for a more efficient drainage system.