What is Lag Time flood hydrographs?

Lag time in flood hydrographs refers to the delay between the peak rainfall and the peak discharge in a river or stream. It represents the time it takes for rainfall to travel through the catchment area and reach the measuring point. Factors influencing lag time include the characteristics of the watershed, such as land use, soil type, and topography, as well as the intensity and duration of the rainfall event. Shorter lag times often lead to quicker and more severe flooding, while longer lag times can help mitigate flood risks.