Contour farming is a type of farming that involves planting crops in rows that follow the contours of the land. This type of farming helps to reduce soil erosion and runoff, which can help to improve water quality. When there is less soil erosion, there are fewer sediments and pollutants that can end up in waterways. Contour farming can also help to increase the amount of water that infiltrates into the ground, which can recharge groundwater supplies and improve water quality.