Water is one of the natural resources vital to any agricultural system. This material was developed in support of the Iowa Agricultural Science, Technology and Marketing (ASTM) program, focusing on groundwater educational concepts related to the 1987 Iowa Groundwater Protection Act. This material was designed to assist teachers in providing systematic groundwater instruction for high school students enrolled in ASTM classes. Eight instructional units include: (1) "Recognizing Groundwater Concerns"; (2) "Describing the Water Connection"; (3) "Locating Direct Connections"; (4) "Managing Nitrogen Fertilizers"; (5) "Managing Agricultural Pesticides"; (6) "Managing Underground Tanks and Pipelines"; (7) "Managing Natural Fertilizers"; and (8) "Managing Urban Fertilizers and Pesticides." Each unit includes lesson plans that feature objectives, interest approach, a list of materials needed, and teaching procedures. Additional information is provided by information sheets, activities, visual masters, references, and videos. A glossary is included to assist in learning terms related to groundwater. Also included is a list of careers in which people may use groundwater knowledge and skills. Lists of water testing laboratories, videos related to groundwater, and a list of farmers participating in the 1989 Resourceful Farming Demonstration are appended. The Groundwater Act and a manual for a groundwater flow model are also provided. (YP)