Wages and salaries consist of the sum of wages and salaries in cash and wages and salaries in kind.
Wages and salaries in cash consist of wages or salaries payable at regular weekly, monthly or other intervals, including payments by results and piecework payments; plus allowances such as those for working overtime; plus amounts paid to employees away from work for on holiday; plus ad hoc bonuses and similar payments; plus commissions, gratuities and tips received by employees.
Wages and salaries in kind consist of' remuneration in the form of goods and/or services that are not necessary for work and can be used by employees in their own time, and at their own discretion, for the satisfaction of their own needs or want or those of other members of their households.
Wastewater/sewage is waste water from homes, business premise or industry that contains organic and inorganic materials in the form of dissolved and suspended particles.
Weighted average of selected ambient concentrations of pollutants usually linked to water quality classes.
Continuous or frequent standardized measurement and observation of the water often used for warning and control.
Area of low-lying land where the water table is at or near the surface most of the time. Wetlands include swamps, bogs, fens, marshes and estuaries.
Areas of marshes, fen, peatland or water, whether natural or artificial, permanent or temporary, with water that is static, flowing, fresh, brackish or salt, including areas of marine water, the depth of which at low tide does not exceed six metres.
Wholesale Trade is defined as "the resale (sale without transformation) of new and used goods to retailers; industrial, commercial, institutional or professional users; or to other wholesalers; or selling merchandise to, such persons or companies".