Ammonia is one of the most widely produced chemicals in the United States. In pure form, it is known as anhydrous ammonia. Ammonia is also produced in the human body and is commonly found in nature. It is essential in the body as a building block for making proteins and other complex molecules. In nature, ammonia occurs in soil from bacterial processes. It is also produced when plants, animals and animal wastes decay.
View a FREE sample. The area in which water enters an aquifer. In a recharge zone surface water or precipitation percolate through relatively porous, unconsolidated, or fractured materials, such as sand, moraine deposits, or cracked basalt, that lie over a water bearing, or aquifer, formation.
A schematic diagram of a groundwater recharge problem is outlined in Fig. 1(a) for an aquifer of length L. The aquifer is bounded by two rivers. River one, at x = 0, at river stage h1, and river two, at x = L, at river stage h2. The hypothetical phreatic surface without recharge is indicated by the curve marked t = 0.