Transport

Water contained in large tanks that can correct the trim of the boat and its balance. Ballast water is a problem during the emptying of the tank (deballasting) because species living in one part of the world are released into another zone, creating ecological disturbances. With the growth of international trade, and especially transoceanic maritime transport, problems arise because of this contribution of living organisms foreign to the local environment. Now, biological and chemical treatment systems must treat these volumes of water to limit the exchange of invasive species.

A harnessed river or canal open to traffic and waterways transport.

Large road or rail bridge, usually consisting of several bays and crossing at high elevation a valley.

Mode of transporting goods or people by sea for the most part.

Mode of transporting goods or people through the national and international waterways networks.

Hydraulic structure fed by water withdrawals from watercourses or bodies of water and mainly intended for navigation, drainage, irrigation or flow regulation.

Utilization of water by human beings (domestic, industrial, agricultural, recreational, cultural uses of drinking water).

All services and activities having a significant impact on water status. Services related to the use of water are water uses characterized by the existence of structures for abstraction, storage, treatment or discharge. They have a fixed asset.

Method for estimating the maximum entry right that visitors of a site would be willing to pay to continue visiting this site. It is based on the idea that travel expenses incurred by individuals to visit a site represent their willingness to pay to visit this site. The travel cost is a measure of the visit unit.