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)).

Local observers record water level and take photographs of the scale every 10 days during the wet season and about once a month during the dry season. For turbidity, water sample are collected by local observer, every 10 days during the wet season and about once a month during the dry season, and sent by bus to Bamako for analyzing turbidity using a turbidimeter. A value of turbidity of 1001 stands for a value exceeding the sensor sensitivity.