Lag time in hydrograph refers to the delay between the peak rainfall and the peak discharge of a river or stream. It is the time taken for water to travel from the point of rainfall to the point of discharge.
Lag time is calculated by finding the time difference between the peak rainfall and the peak discharge on a hydrograph. This can be done by measuring the time it takes for the water to travel from the point of rainfall to the point of discharge.
There are several factors that can affect lag time in hydrograph, including the size and shape of the watershed, land use, soil type, and topography. Human activities such as urbanization and deforestation can also impact lag time.
Lag time is important in hydrograph analysis because it can help identify the characteristics of a watershed and the potential for flooding. It can also be used to assess the impact of land use changes on the hydrological cycle and inform flood risk management strategies.
Lag time is primarily determined by natural factors such as topography and land use, but it can be influenced by human activities. For example, land use changes or the construction of dams can alter the flow of water and ultimately affect lag time. However, it is important to carefully consider the potential impacts of manipulating lag time on the environment and surrounding communities.
