What is one reason why smooth piping is preferred in water transport systems?

Smooth piping is preferred in water transport systems primarily because it reduces wear on pumps. When water flows through pipes, especially rough or uneven surfaces, it can create turbulence and friction, which can lead to increased wear and tear on the pump components. Smooth surfaces facilitate a more laminar flow, decreasing the resistance against the flow of water. This not only enhances the efficiency of the pumping system but also prolongs the lifespan of the pumps, as they do not have to work as hard to move the water through the system.

In contrast, the other options provided do not align with the benefits of smooth piping in water transport. For instance, increasing viscosity would actually have a negative impact on flow rates and would not be desirable. Enhancing toxicity is unrelated to the physical characteristics of piping and would not provide any benefits in a water transport system. Moreover, while a smooth piping system may help with some aspects of installation, the primary reason for its preference is directly linked to the flow dynamics and maintenance of the system's components.