Inventory and Monitoring of Sahelian Pastoral Ecosystems Annex 2: Rainfall in the Ferlo (Sahelian Region of North Senegal) Since 1919 - GEMS Sahel Series No. 2

The present document, the second in the series, describes the climatic context of the rainfall in the test region, presents the long—term rainfall data of the area, and examines these data with the aid of computer programs which are presented in Appendices. It describes and quantifies the variability inherent in the rainfall and seeks to detect patterns in the rainfall grouped Into periods of months and years. Correlations between stations are examined. Rainfall probabilities at certain stations are calculated and annual lsohyets mapped for four years over the test zone.