Hydrology in engineering mainly focuses on the planning, design, analysis, and operation of water-related projects and constructions by the utilization and efficient management of the water resources. It is important for solving the various existing water-related problems such as problems regarding the quantity of water, control, and mitigation of flood, irrigation, etc. It enables one to determine the flow over various hydraulic structures such as spillways, highway culverts, urban storm drainage systems, etc. It also facilitates engineers and hydrologists for establishing the relation between surface water of catchment and underground water resources.