Piezometric surveys in domestic wells in villages or dedicated to pastoral use, where manual measurements are made with commercial luminous probe (OTT, 100 m in length) every month for seasonal and long term mesoscale groundwater balance surveys. The water table level values are expressed from the edge of the well. A value = 9999 stands for a dry well.

Long term rainfall measurements collected since 1990 (Long Observation Period) by 30 recording raingauges over the Niamey meso site (1.6-3.1°E/12.8-14.1°N) with a regular sampling of about 25x25 km². NB: Negative values are missing values. Negative value other than -9999.9 is missing value estimated from the bucket. For a period with such missing data, although the same value is indicated for each timestep, the value applies to the whole time period.

Limnimetric surveys in seasonal, natural ponds with manual (visual) measurements coupled with data loggers. The manual measurements are made on metric scale bars with a frequency of twice a month during the rainy season to once a month during the dry season. As the scale bars are not always matched to zero, water level values from these gauges need to be readjusted taking into account the lowest value read on the scale bars (please consult the specific metadata of each station (list of properties)).

Rainfall measurements collected since 2005 (Enhanced Observation Period of the AMMA project) by ~25 recording raingauges to complement and densify the meso site network (CL.Rain_N), in particular over the Niger Central supersite. NB: Negative values are missing values. Negative value other than -9999.9 is missing value estimated from the bucket. For a period with such missing data, although the same value is indicated for each timestep, the value applies to the whole time period.