(a) The Great Plains Conservation Program (GPCP) is a special program targeted to the total conservation treatment of farm or ranch units with the most severe soil and water resources problems. The purpose of the program is to assist farm, ranch and other land users to make changes in their cropping systems and land uses which are needed to conserve, develop, protect, and utilize the soil and water resources of their lands. This purpose is achieved by controlling erosion, conserving water, and adjusting land use to mitigate climatic, soil, topographic, flood, saline and other natural hazards.(b) Program participation is voluntary and is carried out by applying a conservation plan encompassing an entire operating unit. A conservation plan is developed with the land user in consultation with the local conservation district and is used to establish a GPCP contract. This contract provides for cost sharing between the land user and the Secretary of Agriculture for applying needed land use adjustments and conservation treatment within a specified time schedule. The program is supplemental to, not a substitution for, other programs in the Great Plains area.