Accordingly, the reintroduction of animals, is important. Typically, a wetland is created through the excavation of upland soils to elevations that will support the growth of wetland species through the establishment of an appropriate hydrology. Wetlands may be installed or restored via thisor other approaches such as removing u ndergrou nd drainage tiles. A wide variety of agricultural BMPs exist, including practices such as cover crops, conservation tillage, precision fertilizer application, irrigation efficiency, contourfarmingand agroforestry.