This review is organized into four sections. The review of the status of the hydrological documentation concentrates heavily on the data that is available for the existing and future studies. The two main sections of the report discuss, first the issues that can be accepted from literature, and second the issues about which there is still contention. The next section sets out a full program for the forthcoming reconnaissance visit in terms of the reports that need to be sought, the people and agencies to be visited and the fieldwork to be undertaken. This section also develops some ideas for future field work that the SRBMA may be able to pursue. It lists further desk studies that should be undertaken within the framework of this mission and IDA's work for the forthcoming autumn seminar. The concluding section summarizes the findings of this critical review.