Analysis and Application of Flood Estimation Methods during Project Construction

An estimation of the design flood is required for projects constructed across rivers. Flood peak values exert direct effects on the selection of construction proposals, the cost prediction, and the construction safety. Differenct methods for flood estimation may be determined specifically in each case. Proper selection of flood estimation methods is of great significance for ensuring a smooth construction process. To ensure the construction progress and quality of the project, design flood values should be determined for each specific construction stage, serving as the basis of the overall construction arrangement. When small- or medium-sized projects are constructed across a river, a cofferdam is commonly built first to drain off water from the riverbed, creating a dry work environment for the major work to proceed. The design of cofferdams must rely on the design flood estimation during different constrution periods. Bulding cofferdams in a right way can accelerate the construction pace and reduce the construction cost, while disruption of the construction process could result in serious threat or further damage. Therefore, the determination of flood peak flow prior to construction is of critical importance.