HEC-HMS is a hydrological modeling software developed by the U.S. Army Corps of Engineers to simulate the precipitation, runoff, and streamflow of watersheds. It allows water resource managers, engineers and other professionals to forecast river flows, calculate dam and levee capacities and design reservoirs. HEC-HMS uses precipitation data, soil characteristics, land use and vegetation cover, and other parameters to simulate the hydrological cycle and hydraulic processes in a watershed. The software is used to support water management and planning decisions by providing data and information to stakeholders.

HEC-RAS (Hydrologic Engineering Centers-River Analysis System) is a software application used for modeling water flow in rivers, channels, and other waterways. It is mainly used by engineers and hydrologists for hydraulic analysis, floodplain mapping, and bridge and culvert design. The application uses hydraulic and hydrologic principles to calculate water depths, velocities, and flow rates in order to predict how a river or waterway will behave under specific conditions. It also helps in predicting the impact of changes in flow on the environment and infrastructure.

Hydraulic Engineering refers to the branch of engineering that deals with the flow and conveyance of fluids, primarily water. This skill encompasses the design and analysis of systems such as dams, levees, canals, and pipelines, ensuring efficient water management and flood control. Knowledge of Hydraulic Engineering is used to develop solutions for water resource management, environmental protection, and infrastructure development by applying principles of fluid mechanics and hydrology.

SRH-2D refers to the skill of using two dimensional hydraulic modeling tools to analyze water flow and related channel behavior in rivers, streams, and engineered waterways. It is applied in planning, design, and assessment work to estimate flow patterns, water levels, sediment movement, and impacts of proposed changes to water systems. The skill supports technical evaluation of flood conditions, erosion, and river restoration projects by helping interpret model inputs, results, and assumptions.

Urban Drainage refers to the design and management of systems that control surface water runoff in urban areas to prevent flooding, erosion, and water pollution. It includes stormwater management, drainage networks, retention basins, and green infrastructure solutions. This practice is essential in city planning and civil engineering to ensure sustainable water management and environmental protection.