AZI — Crues of the atlas of flooding areas in the department of the Pyrenees-Atlantiques

The L_AZI_CRUE_S_064 table consists of the right-of-way polygons of flooding characterised by flood frequencies:
— 02: very frequent flooding (annual order);
— 30: centennial flood
— 03: frequent flooding (return from 5 to 15 years);
— 40: 10-year flood
— 04: exceptional flood.
Studies carried out in ten phases between 1994 and 2008. (See associated documents pdf).
This map aims to inform citizens and decision-makers about the risk of flooding. It has no regulatory scope and cannot be a substitute for a planning document or a Risk Prevention Plan (RPP). Nevertheless, it allows citizens and officials, elected or administrative, to better appreciate the extent of areas that pose a significant flood risk or promote water sprawl. It is a tool for information and decision-making. It cannot be ignored in particular when drawing up planning documents and explaining them.This map may be reproduced, except for commercial purposes. It outlines areas with a probability of annual flooding of 1/10 (crue 10-year) and the probability of annual flooding is 1/100 (crue centennial). The approach combines hydrology (knowledge of watercourses and flow dynamics) with river geomorphology (analysis of the forms of the bottom of the valley).
All available data have been taken into account and analysed: studies, archives, hydrological information... Another limitation of the study is the type of flood studied: the overflow of the watercourse. Floods have not been mapped by rising water or of the type of urban storm runoff. The presence of water in the bottom of the bowl, such as a doline, is a natural hydrological phenomenon and is therefore not shown on this map.