Floods areas in the paulista region of river basin Paraiba do Sul and headwaters of Rural Environmental Register

Abstract The knowledge of urban flood risk areas associated with the rural environmental register database allows to identify where small rivers begins. This article combines and assesses the risk prone areas with headwaters and proposes actions. The goal of this work was to evaluate the relationships between flood risk and the environmental conditions of headwaters (both in preserved, consolidated areas and to be reforested) of 10 municipalities in the Paraiba Valley, previously mapped by the Institute of Technological Research (IPT). The results showed that, for the municipalities evaluated, 10,324 headwaters were registered and, for all municipalities the quantity of preserved areas is higher in comparison with the consolidated areas. Furthermore, there is a lack of vegetation restoration project in rivers that causes flooding in the studied municipalities, even after changes in the Brazilian Forest Code. These results provide valuable information to the local institutions that conduct actions for the restoration of deforested areas and several other initiatives that aim to mitigate flood risk in the areas assessed in this study.

摘要：结合乡村环境登记数据库与城市洪涝风险区域信息，可精准定位小型河流的源头位置。本文整合易涝区域与源头水系数据开展评估，并提出针对性行动方案。本研究旨在评估帕拉伊巴谷10个市镇的洪涝风险与源头水系环境状况之间的关联，上述源头水系涵盖已保护、已整治及待造林三类区域，相关区域此前已由技术研究协会（Institute of Technological Research, IPT）完成测绘。评估结果显示，本次研究共登记10324处源头水系，且所有受访市镇的已保护区域数量均高于已整治区域。此外，即便在《巴西森林法》修订后，本次研究涉及的市镇仍存在河道植被修复项目缺失的问题，这也是引发洪涝灾害的重要诱因。本研究结果可为当地开展退化林地修复工作的机构，以及旨在缓解本次评估区域洪涝风险的其他多项举措提供重要参考依据。