What type of system adjustment might lead to increased water flow?

Opening more distribution valves is a method that directly increases water flow in a distribution system. When additional valves are opened, it allows more pathways for water to travel through the system, effectively reducing resistance and increasing flow rates. This can be particularly beneficial in ensuring that adequate water supply reaches consumers and managing the overall distribution efficiency.

In contrast, turning off water meters could lead to inaccurate readings and does not necessarily increase water flow; limiting water flow can occur if meters are closed. Reducing system pressure generally leads to a decrease in water flow since lower pressure means less driving force for the water to move through pipes. Installing backflow preventers is crucial for preventing contamination and ensuring safe water delivery, but they do not facilitate an increase in flow; their main function is to protect the water supply rather than enhance flow rates. Thus, the most effective way to increase water flow among the given options is by opening more distribution valves.