The term flooding is often associated with a stream overflow or a marine flood, runoff-floods is rarely considered, and today suffers from a lack of knowledge and control of the phenomenon. This paper, presents a geographic information system iRIP@ – Flooding by Intense Pluvial Runoff (French acronym), which is a new tool to mapping flooding by runoff as a tool for decision-making by mapping runoff flooding in Gareat El Taref catchment (Northeast Algeria), with identifying the area of production, transfer and accumulation of flood.Us results, we have cards represent the potential of a territory to generate the various hydraulic dynamics of runoff: the runoff production card, the runoff transfer, the runoff accumulation card, the runoff-flooding card.A visual simulation on the flood risk card indicates that the areas with an important runoff flood risk are the communes of Khenchela Oum El Bouaghi Ain El Beida and F’kirina. Moreover, the roads that join Khenchela with Ain El Beida and with Oum El Bouaghi.Khenchela city is exposed to a great risk of flooding by runoff, the solution proposed by the authorities and that summarizes by the construction of a canal is not sufficient, because on the one hand the north of the city remains exposed to this risk. On the other hand, a large area of runoff production is located between the canal and the city.It is probably operating to encourage farmers to introduce certain agricultural practices that are part of a sustainable management of flood risk by runoff.
Water in the Gareat El Tarf basin, is affected by climatic and economic constraints; while its development is based on the agricultural sector, which creates pressure on water resources. The objective of this study is to analyse the performance of the national water plan to accompany this policy, and the impact of climate change on water resources. The methodology adopted is the application of the WEAP(Water Evaluation and the Planning)software, in order to build a model for the allocation of water resources, up to 2050. The results obtained confirm that the impact of the economic policy shows a very important deficit that exceeds 400 million m3 in 2050. To face this challenge, it is recommended to adopt an economic strategy based on the protection of water resources and adapted to the supply capacities of renewable water resources.
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