Aquifer productivity map

Aquifer productivity map of the transboundary Komadugu-Yobe region (Niger, Nigeria). To add a quantitative component to the individual productivity classes, a classification methodology proposed by Krásný (1993) was adopted relating qualitative productivity classes to absolute values of transmissivity, specific capacity and yield. Available field measurements were used to first categorise the productivity of each borehole and then to assign a mean productivity class to each lithological unit Source: BGR & UNESCO