DDT 91 — The technological risk prevention plans (PPRT) of the Essonne department.

Risk Prevention Plans (RPPs) are the key government instrument for risk prevention. Their objective is to monitor development in areas exposed to a major risk. The PPRs are approved by the prefects and generally carried out by the departmental directorates of the territories (DDT). These plans regulate land use or land use through building prohibitions or requirements on existing or future buildings (constructive provisions, vulnerability reduction work, restrictions on agricultural use or practices, etc.). This geographical table makes it possible to map existing PPRTs on the department. Each PPRT is identified by a polygon that corresponds to: — within the scope of prescription when it is in the prescribed state, — the envelope of restricted zones when it is in the approved state. Each PPRT existing in the geographical table N_DOCUMENT_PPRT is linked with its GASPAR code in the format “ddd[PREF|DDT|DDTM|DREAL]aaaannnn” (AAAA and NNNN correspond to the reference year and the order number of the associated PPR procedure in GASPAR).