Distributed memory parallel groundwater modeling for the Netherlands Hydrological Instrument

Worldwide, billions of people rely on fresh groundwater reserves for their domestic, agricultural and industrial water use. Extreme droughts excessive pumping put pressure authorities in maintaining sustainable usage. High-resolution integrated models are valuable assets supporting them. The Netherlands Hydrological Instrument (NHI) provides the Dutch with open source modeling software data. However, NHI often require long run times large memory usage, therefore strongly limiting application. As a solution, we present distributed parallelization, focusing National Model. Depending level integration, show that significant speedups can be obtained up to two orders magnitude. far as know, this is first reported parallelization an operational hydrological model used national-scale management policy making. parallel code data freely available.