1. The series of rational steps that leads to the proof (or disproof) of a scientific or research hypothesis. The steps are observation, which leads to the formulation of a hypothesis through abductive reasoning, followed by tests or experiments to determine the validity of the hypothesis (deductive reasoning). The observed result of the experiment is compared to the expected result, and a conclusion is made supporting or contradicting the hypothesis. 2. The scientific method is the process by which scientific facts are discovered, proven, or learned.

Surface runoff that is confined to a stream or river channel.

In Arizona, subdivision is defined as the act of dividing a parcel of land into six (6) or more parcels of equal or unequal size, any one or more of which is less than thirty-six (36) acres and offered for sale or lease. A disclosure law, the purpose of which is to protect the public from fraud through full and accurate disclosure, governs subdivision of land in Arizona. After state approval of the subdivision application, the subdivider must pay travel and related costs for an inspection of the site by the Arizona Department of Real Estate (ADRE). In addition, if the proposed subdivision is within an Active Management Area (AMA) as defined by the Arizona Department of Water Resources (ADWR), the subdivider or developer is "required to demonstrate an assured water supply that will be physically, legally, and continuously available for the next 100 years before the developer can record plats or sell parcels". Demonstration of an assured water supply is required before ADRE will issue a public report, allowing the developer to sell lots in the subdivision. This is known as the Assured Water Supply Program. In locations outside of AMA's, the Adequate Water Supply Program requires that a developer or subdivider may still sell lots in a subdivision even if the 100-year water supply is determined to be inadequate, as long as this fact is dislosed to potential buyers in the public report and in all promotional materials. Both water supply programs are overseen by ADWR's Office of Assured and Adequate Water Supply.

Water that flows over the earth's surface; precipitation that falls to the earth, is not infiltrated, evaporated, or transpired, and exceeds the capacity of the soil or the vegetation to absorb it.

The process by which water is released to the atmosphere by trees and other plants.

A body of free-flowing water, such as a river or stream,; the channel that contains a free-flowing body of water. Also known as a waterway.

1. Area of land that drains all surface runoff to a common point. Large watersheds often contain numerous small watersheds; all land areas of the earth are within at least one watershed or sub-watershed.
2. The land area drained by a river and its tributaries.

A body of free-flowing water, such as a river or stream,; the channel that contains a free-flowing body of water. Also known as a watercourse.

A hole or shaft that is dug into the ground to access underground stores of water or other substances. The well structure has three parts: the casing, the pump, and the pipes through which the water is discharged.