Simple download service (Atom) of the dataset: Flooding areas outside PPRI in Haute-Garonne

Natural risk flooding from river overflow, outside RPP areas.
Envelope zones of all known floods, either by modelling or by field observation.
WARNING:
As a result of their acquisition, the contours of flood zones (and associated data) are strictly informative and are intended to be exploited on scales between 1/10 000 and 1/100 000.
This mapping has no regulatory scope and cannot replace an urban planning document such as the Soil Occupancy Plan (POS) or the Natural Risk Prevention Plan (PPRN).

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 a bowl bottom, for example a doline, is another natural hydrological phenomenon and is therefore not shown on this map.

The mapping is very complete but is not exhaustive:
— very strong but very localised rains (thunderstorms) can cause locally powerful floods but which very quickly lose this power downstream of the basin. The phenomenon is so
punctual in time and space (it can happen everywhere) that it is not possible to
map it.
— some streams or “rus”, usually the smallest, have not been studied.

IMPORTANT: This layer is originally a layer created by DREAL (CIZI), but it is refined by DDT31 using field survey data

本数据集涵盖RPP区域外由河道漫溢引发的自然洪涝灾害相关数据。
其包含所有已探明洪涝事件的包络范围，数据来源涵盖建模模拟与实地观测两类方式。
警告：
本数据集所产出的洪涝范围等值线及关联数据仅作参考用途，仅适用于1:10000至1:100000的地图比例尺场景下使用。
本测绘成果不具备法定效力，无法替代《土地占用规划（POS）》或《自然风险预防规划（PPRN）》等法定城市规划文件。

本研究的另一项局限在于，仅针对河道漫溢型洪涝开展制图，未涵盖水位上涨型洪涝或城市暴雨径流型洪涝。例如漏斗状洼地（如落水洞（doline））内的积水属于另一类自然水文现象，因此未在本地图中予以体现。

本测绘成果覆盖较为全面，但并非穷尽所有洪涝情形：
— 强度极高但局地性极强的降雨（雷暴）可引发局地强洪涝，但此类洪涝在流域下游会快速消退。该现象在时空上极具偶然性（可发生于任意区域），因此无法完成全域制图。
— 部分小型溪流或"rus"通常未被纳入本次研究范围。

重要提示：本图层最初由DREAL（CIZI）制作，后由DDT31结合实地勘测数据进行了优化完善。