A Geographical Information System (GIS) is used to investigate the relationship between a set of agricultural indicators and water pollution potential. Variation in both physical (land) characteristics and usage (management) practices are considered to influence the risk of phosphorus loss to surface waters. The factors considered in evaluating the potential for loss and transport of phosphorus from agricultural systems are as follows:
- Runoff Risk to Surface Waters. The physical characteristics which influence the transport of phosphorus to surface waters: geology, soil type, slope and rainfall are combined in a runoff risk map.
- Land use
- Soil Phosphorus Levels
- Mineral Fertiliser Loading
- Organic Fertiliser Loading (cattle, sheep)
- Organic Fertiliser Loading (Intensive Agricultural Enterprises