Water Quality and Erosion Control Best Management Practices. In New Hampshire, Best Management Practices (BMP) are defined as, the “Proper methods for the control and dispersal of water on truck roads, skid trails, and log landings to minimize erosion and reduce sediment and temperature changes in streams.” Every timber harvesting operation involves some risk of soil erosion and sedimentation that may affect water quality. With a common understanding of the risks and through the use of BMPs, the forest industry, landowners, and the government can protect our state's water resources. In New Hampshire, all timber harvests must follow the BMPs published in Best Management Practices for Erosion Control for Timber Harvesting operations in New Hampshire, 2004. To view a copy of this document click here, In addition to Best Management Practices for Erosion Control for Timber Harvesting operations in New Hampshire, 2004, New Hampshire also set of BMPs specific to water quality. Although not a regulatory document these BMPs do provide good examples of practices and the theory behind BMP installation and operation. To view a copy of UNH Cooperative Extensions Best Management Practices for Water Quality click here. Within the next year the New Hampshire Division of Forest and lands will be combining the two documents into one central BMP manual.