Dataset Direct Download Service (WFS): Zoning of the PPRN flooding of the downstream Gers department in the Gers department

Plans for the prevention of natural hazards (PPRN) were established by the Act of 2 February 1995 on strengthening the protection of the environment. They are the key instrument of the State in the field of risk prevention. The objective of this procedure is to monitor development in areas exposed to a major risk. The PPRNs are decided by the prefects and usually carried out by the departmental directorates of the territories (DDT). These plans regulate land use or land use through construction prohibitions or requirements on existing or future buildings (constructive provisions, vulnerability reduction work, restrictions on agricultural use or practices, etc.).
These plans may be under development (prescribed), implemented in advance or approved.
The hazards arise from the crossing between water heights and velocities. They are classified into three types: severe hazard (h is greater than 1 m and/or V is greater than 0.5 m/s), medium hazard (h is between 0.5 and 1 m and/or V is between 0.2 and 0.5 m/s), low hazard (h is less than 0.5 m and/or V is less than 0.2 m/s)