Water systems can have a huge impact on humans. Depending on a water system, fresh water could more or less difficult to access. Certain eco-systems can be shaped differently with different water systems. This could affect where we fish, farm or hunt. Water systems define how water, the most important item for us, is used and moved. Water systems are mainly associated with water and we need that water.
Water systems can affect climate and precipitation. Whether positive or negative it definitely does. Here are a few ways!
Large bodies of water: Oceans, seas, and large lakes affect the climate of an area. Water heats and cools more slowly than land. So during summer, coastal regions will stay cooler and in winter warmer. This creates a balance.
Moisture: If an area has more moist air, than it is most likely to rain there more often.
Hannah R.L. - Water Systems 