Source: https://www.researchgate.net/profile/Olivier_Fouche/publication/278801854_Evolution_piezometrique_de_la_nappe_phreatique_de_Seine-Saint-Denis_et_zonage_d'infiltrabilite/links/55d33ce208ae7fb244f583b3/Evolution-piezometrique-de-la-nappe-phreatique-de-Seine-Saint-Denis-et-zonage-dinfiltrabilite.pdf