The Mahi—one of the major rivers in Western India—is subject to frequent major flooding, which severely affects the local economy and infrastructure. Little has been done, however, to assess the flood patterns and severity along its course. Here, the Mann–Kendall and Pettitt tests are used to identify long-term trends of precipitation and peak streamflow at multiple locations in the catchment. Then, flood susceptibility mapping is performed by the analytical hierarchy process, accounting for 14 geomorphic, hydraulic, and geologic factors. The analyses suggest a decline in total precipitation and peak flow discharges at most locations, consistently with the general climatic trend of the area, featuring a weakening summer monsoon. Nonetheless, a significant portion of the catchment area remains highly susceptible to flooding, with stream powers capable of mobilizing boulders up to 1 m in size in extraordinary floods. These results can support the work of engineers and policymakers dealing with floods in the study area, but the proposed methodology can also be applied to other fluvial catchments to evaluate the role of climate trends in modulating flood susceptibility.

印度西部主要河流之一的马希河经常遭受大洪水，严重影响当地经济和基础设施。然而，几乎没有人评估沿途的洪水模式和严重程度。在这里，Mann-Kendall 和 Pettitt 检验用于确定集水区多个位置的降水和峰值流量的长期趋势。然后，通过层次分析法进行洪水敏感性绘图，考虑了 14 个地貌、水力和地质因素。分析表明，大部分地区的总降水量和峰值流量下降，与该地区的总体气候趋势一致，以夏季风减弱为特征。尽管如此，集水区的很大一部分仍然很容易受到洪水的影响，具有能够在异常洪水中移动高达 1 m 的巨石的河流力量。这些结果可以支持研究区域内处理洪水的工程师和决策者的工作，但所提出的方法也可以应用于其他河流流域，以评估气候趋势在调节洪水易感性中的作用。