What people are saying - Write a review
We haven't found any reviews in the usual places.
30 Mean 600 cubic metres acres Albert Nile April Assiout Assuan Assuan and Cairo Assuan gauge Atbara August Bahr Zeraf Barrage basin irrigation Blue Nile Cairo Cairo gauges canals catchment basin centimetres channel Cretaceous cubic metres cubits Dakhla Damietta Damietta branch Date December Delta deposits depth Dufile Egyptian Eocene Fayoum February flows Gazelle river Ghaba Shambe Gondokoro high flood January July June Khartoum Lake Albert Lake Choga Lake Moeris Lake Victoria land limestone low floods low supply Main Nile March maximum discharge metres above sea metres per second minimum Month Nile flood Nile valley oasis perennial irrigation rain rainfall reaches reservoir Ripon Falls rise Rosetta branch sea level Sept September Shambe silt Sir William Garstin slope Sobat mouth Sobat river soil square kilometres stream Sudan Sudd region summer supply to-day Total tributaries Upper Egypt velocity Victoria Nile Wadelai Wady Rayan White Nile width
Page 68 - By certain scales i' the pyramid ; they know By the height, the lowness, or the mean, if dearth Or foison follow. The higher Nilus swells The more it promises ; as it ebbs, the seedsman Upon the slime and ooze scatters his grain, And shortly comes to harvest.
Page 79 - Moeris, will be well able to supply the two remaining milliards of cubic metres of water when working in conjunction with the Assouan Reservoir. The great weakness of this projected lake has lain in the fact that by itself it can give a plentiful discharge in April and May, less in June, and very little in July, and it was for...
Page 79 - Mœris being directly in communication with the Nile, and only slightly above low Nile level, its discharge would depend entirely on the difference of level between it and the Nile, and consequently as the summer advanced, it would gradually fall and would not be able to give at the end of the summer a quarter of the discharge it could give at the beginning.
Page 68 - ... narrow, they average 2000 acres each, and where it is wide 20,000 acres ; while some of the tail basins are 40,000 acres in extent. Each canal has about seven or eight basins depending on it, of which the last is always the largest. There are masonry regulators at the canal heads, at each crossing of the cross banks, and at the tail escapes into the river. In the more perfect basins the canals and escapes syphon under one another and overlap and supply each other's deficiencies, so as to meet...
Page 76 - ... irrigated at all. The problem is how to provide perennial irrigation to these 2,000,000 acres, and so add ^60,000,000 to the wealth of the country. To give all the agricultural lands perennial irrigation, Egypt requires reservoirs capable of storing four milliards of cubic metres of water. The Assuan reservoir, at its present level, contains one milliard of cubic metres of water, which will suffice for the conversion of 500,000 acres to perennial irrigation. But though the dam was only completed...
Page 76 - ... the discharge in the outlet canal began to fail. I cannot do better than quote his own words, which describe his proposal very graphically : — " When the Assouan dam will have been raised, we shall be standing on the threshold of what it will be able to do.
Page 68 - They let the flood into the depression when it was dangerously high and provided for its return to the river when the inundation had come to an end. By this means they insured the lake against being at a high level during a period of flood. The gigantic dikes of entry and exit were only cut in times of emergency, and were reconstructed again at an expense of labor which even Pharaoh considered excessive.
Page 75 - Of this area, 250,000 acres, which are to-day inundated in flood and lie along the edge of the deserts, must continue to be inundated in flood for all time to prevent the sands of the desert from spreading over the Nile Valley. Their value is £5,000,000. Four million acres are perennially irrigated. They have a mean value of £55 per acre, and a total value of £220,000,000.
Page 30 - ... 1904. fol. Pp. 20). The object of this study was to collect existing data as to the changes of level of the lake, and to endeavour to trace from these data the oscillations of the lake during the last twenty or thirty years. Two rainy and two dry seasons make up the year in the Victoria Lake basin, the rains coinciding more or less with the equinoxes, and the dry seasons with the solstices, except that the second, or minor, rains are delayed one or two months after the autumn equinox. The rainfall...
Page 73 - Indian corn stalks, keeping the waves off the loose earth of the banks. In a settlement of a culvert in the Nile bank north of Mansourah in 1887 I witnessed a scene which must have once been more common than it is to-day. The news that the bank had breached spread fast through the village. The villagers rushed out on to the banks with their children, their cattle, and everything they possessed. The confusion was indescribable. A narrow bank covered with buffaloes, children, poultry, and household...