This book conducts a comprehensive analysis from the weather caused by heavy rains, the characteristics of heavy rains and floods, and the application effects of water conservancy projects. It also conducts special analyzes on the spring flood forecast error at Wangjiaba Station, the regularity of flood peak flow at Wangjiaba Station, and Typhoon "Phoenix". This book has 5 chapters in total, Chapter 1: Overview of the river basin, Chapter 2: Rain regime analysis, Chapter 3: Water regime analysis, Chapter 4: The impact of water conservancy projects on floods, and Chapter 5: Special analysis.