As urban areas grow in size and population, they rely more heavily on surrounding rural areas for additional land and water resources. Such a situation has arisen in North Carolina's Chapel Hill-Carrboro area. In the last decade, the population of the area and the number of people served by the Orange Water and Sewer Authority (OWASA) have increased by 33 percent. If the expected growth trend continues the OWASA must locate an additional, reliable source of raw water to meet the projected demands. This is difficult given the rapidly urbanizing areas and also pollution from agricultural land use.