INCLUDED IN THIS REPORT ARE TWELVE ARTICLES DEALING WITH THE WATER RESOURCES OF THE UPPER NILE, AGRICULTURAL AND AQUATIC ENVIRONMENTS OF THE SUDAN, AND PROBLEMS OF CONTROLLING THE SPREAD OF WATER HYACINTH, WHICH IS INTERFERING WITH NAVIGATION, IRRIGATION, FISHING, AND SUPPLIES OF DRINKING WATER. FOR THE SUDAN THE NILE IS THE MAIN SOURCE OF IRRIGATION WATER FOR AGRICULTURE, HYDRO-POWER POTENTIAL, FISH SUPPLY, RIVERAIN GRAZING, AND WATER TRANSPORT. PRESENT IRRIGATED AREAS OF 4.6 MILLION ACRES ARE SUPPLIED BY A HIERARCHICAL SYSTEM OF SUPPLY CANALS. THE ESTIMATED SURFACE AREA OF FRESH WATER IN THE SUDAN IS ABOUT 10 MILLION ACRES. THIS IS EQUAL TO THE AREA OF IRRIGABLE LAND TO BE DEVELOPED. NEW DAMS AND WATER CHANNELS ARE INCREASING THE SURFACE AREA OF WATER, AND MEANS MUST BE FOUND OF PREVENTING THE SPREAD OF WATER HYACINTH AND OTHER AQUATIC WEEDS IN THE PRESENT AND NEW WATERWAYS. THE WATER HYACINTH NOW INFESTS VAST AREAS. IT REPRODUCES SO RAPIDLY THAT EFFORTS TO CONTROL IT HAVE BEEN INEFFECTIVE. MANY MEANS HAVE BEEN CONSIDERED FOR UTILIZING THE PLANT IN ORDER TO RECOUP COSTS INCURRED IN EFFORTS TO KILL IT. MUCH RESEARCH MUST BE CONDUCTED TO ESTABLISH THE MOST EFFECTIVE NEW MEANS OF CONTROL, AND COST-EFFECTIVE USES OF THE PLANT AS ANIMAL PROTEIN. SOME OF THOSE POSSIBILITIES ARE DISCUSSED IN THE ARTICLES IN THIS DOCUMENT.