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Human and physical factors affecting the River Nile's discharge.

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Introduction

Human and physical factors affecting the River Nile's discharge The livelihood and stability of Egypt's population is directly linked to the Nile valley and delta. These two regions account for less than 5% of Egypt's land surface but the agriculture and water sources are largely concentrated in these areas. The water sources are for the Nile are the Blue Nile (originating at Ethiopian highland) and the White Nile draining east central Africa and Sudan). The river flows through Egypt towards the Mediterranean Sea, forming a delta at its southeast coast. Before the 1960's, the discharge from the Nile largely varied throughout the year, although the source from the White Nile remained fairly constant (being based in an equatorial climate). ...read more.

Middle

However, during the 1950's the Egyptian government had to face a very high population growth rate. Given its limited resources of arable land in the Nile valley, Egypt was looking for opportunities to expand its agriculture, energy and associated manufacturing production. The easiest alternative was to expand the irrigated areas and to increase the number of crops per year. In 1960, constructions for an additional dam; the high dam at Aswan began.. The main aims of the dam were: to control the river's discharge, to store water from each annual flood achieving regulated releases of water for irrigation, and to generate hydroelectric power. ...read more.

Conclusion

However, the dam was not all good news and caused some detrimental effects: The dam had a role as a sediment trap - as a result the sediment load was filling the reservoir instead of reaching the land which required it for good fertility. In addition, because of the increase in dissolved solids in the Nile water, more salts reached the soils and ground water. The stronger affinity of the salty water to the sediments decreased future agricultural land and water resources and also increasing coastal erosion of the delta. Overall, the dam has been a success in terms of regulating the flow of the river to produce a more evenly spread discharge and to reduce flooding risks, but has not however helped the agricultural economy in terms of producing more crops for the growing population. ...read more.

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