Abstract
Groundwater flow is a major source of water for the river discharge and it plays a key role in catchment hydrological modelling. This chapter describes how the groundwater flow component is conceptualized and treated in a catchment model. It also derives the conceptual method (linear reservoir) and describes the physically based method with key equations for groundwater flow. Different types of model boundary conditions, sources and sinks, and the difference between steady-state and transient groundwater flow simulations are also briefly described. It also presents a short description of how the groundwater flow component is represented in 17 different catchment models reviewed in this chapter.
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