If future events at Mount Adams are like those of the past, the hazard from lahars and debris avalanches exceeds all others. The series covers investigations in all phases of hydrology, including hydrogeology, availability of water, quality of water, and use of water. They are published to disseminate administrative information or important scientific information of an ephemeral nature. This report assesses the status, needs, and associated costs of seismic monitoring in the United States. It sets down the requirement for an effective, national seismic monitoring strategy and an advanced system linking national, regional, and urban monitoring networks.
Ground water is obtained from wells and springs that are open to aquifers.
Groundwater is replenished by precipitation that moves through the unsaturated zone of the land surface to the water table or by artificial replenishment. An aquifer may be only a few feet thick to hundreds of feet thick, and ground water can move within the rock pores or joints in an aquifer or it can move from one aquifer to another. Hydrologists use several techniques to locate ground water, including visual clues from the landscape and plants. Hydrologists also estimate the visual clues from the landscape and plants. Hydrologists also estimate the amount of ground water in an aquifer and conduct tests to determine if it is suitable for use.