The increasing demand for detailed information on hydrological processes as they are influenced by land use, soil characteristics, and water management have encouraged the development of dynamic process-oriented models. Currently applied models are not perfect and have to be thoroughly tested and validated. The awareness of the need for good modeling practice protocols is increasing outside the academic community as well. Testing protocols include verification of (numerical) model codes and validation against field experiments. Therefore, we were very pleased with the paper by Vanderborght et al. (2005) on benchmark tests for numerical models that use Richards' equation for water flow...

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