WILLINGNESS-TO-PAY (WTP)

The price that someone is willing to give up or pay to acquire a good or service. It is the source of the demand price of a good. However, willingness to pay does not require an actual payment.

WILLOW CARR

A pool, or wetland dominated by willow trees or shrubs.

WINDROW

A long, narrow row of vegetation, debris, and some soil created during site preparation and clearing operations.

WINDTHROW

Trees uprooted by excessive wind. Shallow-rooted trees are almost always affected.

WING WALL

Side walls of a structure used to prevent sloughing of banks or channels and to direct and confine bank material.

WINTERS DOCTRINE

U.S. Supreme Court 1908 decision that established the doctrine of federal reservation rights.

WITHDRAWAL

Water removed from the ground or diverted from a surface-water source for use. Also refers to the use itself; for example, public-supply withdrawals or public-supply use. See also Offstream use.

WITNESS ASSESSMENT

Assessment conducted by an Accreditation Body to verify and observe the competence of an evaluation/inspection/audit conducted by an applicant or accredited CAB

WOOD PRODUCTS

Products derived from wood harvested from a forest, including fuelwood and logs and the products derived from them such as sawn timber, plywood, wood pulp and paper