Abstract The Chalk is an unusual karst aquifer with limited cave development, but extensive networks of smaller solutional conduits and fissures enabling rapid groundwater flow. Small-scale features (stream sinks, dolines, dissolution pipes, springs) are common, hundreds stream sinks recorded. Tracer velocities from 27 connections between springs have median mean 4700 4600 m d −1 . Tests to abs...

RichardsFoam3 is an updated version of the OpenFOAM® solver RichardsFoam, previously presented in “An open source massively parallel for Richards equation: Mechanistic modelling water fluxes at watershed scale” by L. Orgogozo, N. Renon, C. Soulaine, F. Hénon, S.K. Tomer, D. Labat, O.S. Pokrovsky, M. Sekhar, R. Ababou, Quintard (Comput. Phys. Commun. 185 (2014) 3358-3371, https://doi.org/10.1016...