我国南方即将进入主汛期，防汛备汛进展如何？

Core Viewpoint - The southern region of China is expected to enter the main flood season starting June 1, with the Ministry of Water Resources emphasizing the importance of flood prevention and preparedness measures [1] Rainfall and Water Conditions - Nationwide precipitation has been generally below average, with a mean rainfall of 138 mm as of May 22, which is 11% lower than the historical average of 155 mm [2] - Major river systems are experiencing a 30% decrease in runoff compared to the same period last year, with specific reductions in the Yangtze and Huai rivers ranging from 20% to 60% [2] - Despite localized heavy rainfall, the overall flood situation in major rivers remains stable, with 38 rivers experiencing floods above warning levels, most of which have receded below warning levels [2] Flood Prevention and Preparedness - In Guangdong, flood prevention preparations are underway, including detailed inspections of key water infrastructure [3] - As of May 20, 3,934 out of 4,257 key water damage repair projects have been completed, with the remaining projects expected to be finished by the end of June [3] - The Ministry of Water Resources has issued 24 meteorological warnings for mountain flood disasters and 244 flood and drought warnings to relevant authorities and the public [3][4] Future Flood Predictions - Predictions indicate that from June to August, several river basins, including the Yangtze and Yellow Rivers, may experience above-average rainfall, while some areas may face drought conditions [5] - Specific regions such as the middle reaches of the Yellow River and parts of the Huai River are at risk of significant flooding during the main flood season [5] Goals for Flood and Drought Management - The Ministry of Water Resources aims to ensure water supply for urban residents and agricultural irrigation, with specific targets to prevent casualties and infrastructure damage during the flood season [6]