Introduction
Manitoba is very fortunate to have an ample supply of good-quality surface water. Many communities rely upon surface water for their drinking water supply, as well as for ecreational purposes such as swimming and boating. Agricultural uses include watering livestock, irrigating crops and processing food. And, equally important, water is sed by wildlife and is home to many aquatic organisms. However, often these same users cause surface water quality problems. Several agricultural practices can harm ater quality. Allowing contaminated runoff to flow into surface watercourses is one of them. What is a a