The NODAK system is primarily designed to?

The NODAK system is primarily designed to protect ground water by effectively managing the containment and treatment of potential contaminants. This is crucial in maintaining the integrity of groundwater resources, which are vital for drinking water and ecological health. The system focuses on preventing pollutants from reaching underground aquifers, thus safeguarding public health and the environment.

The reason other options do not align with the primary purpose of the NODAK system is that while decreasing surface area or allowing evaporation of liquids may have applications in water management, they do not address the critical goal of groundwater protection. These factors are not the core functions of the NODAK system, which is specifically tailored to mitigate risks associated with contaminant infiltration into groundwater.