Urban speleology applied to groundwater and geo-engineering studies: underground topographic surveying of the ancient Arca D’Água galleries catchworks (Porto, NW Portugal) by Fontes G., Marques J.M., Lopes M.E., Devy-Vareta N.F., Gomes A., Fonseca P.E., Plancha J.P., Monteiro Santos F.A., Cortez C., Rodrigues P., Robalo P.M., Afonso M.J., Chaminé Helder I., Pires A., Rocha F.

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