(Extract from preface)The Hydrometry Project TCP/SOM/8906 was born after the visit to Somalia of the Hydrologist Jean C. Henry in 1979, to evaluate irrigation potential along the Juba and shebelli rivers. During this study the Hydrometric data base was questioned as regards both its validity and representativity. The first steps taken to rectify the situation was the formulation of the Hydrometry Project and its implementation in January 1980. The main objectives of the Hydrometry Project were to try and re-rate all the National Hydrometric stations on the Jubba and Shebelli rivers.