Drainage water salinity and quality across nested scales in the Nile Delta of Egypt
| Autor: | Maha El Bialy, François Molle, Waleed Abou El-Hassan, Edwin Rap, Doaa Ezzat El-Agha |
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| Rok vydání: | 2019 |
| Předmět: |
Irrigation
Salinity Health Toxicology and Mutagenesis Sewage 010501 environmental sciences 01 natural sciences Soil Water Quality Environmental Chemistry Humans Drainage Groundwater Drainage system (agriculture) 0105 earth and related environmental sciences Nile Delta Hydrology geography geography.geographical_feature_category business.industry Water General Medicine Pollution Water quality Agriculture Environmental science Soil horizon Spatial and temporal variability Egypt business Environmental Monitoring |
| Zdroj: | Environmental science and pollution research international. 27(26) |
| ISSN: | 1614-7499 |
| Popis: | Improving water management depends on understanding the functioning of irrigation and drainage systems across different environmental scales. For this purpose, this study in the Nile Delta of Egypt particularly examines the spatial and temporal variation of drainage water salinity from the system to the plot level. A better understanding of this variation across nested scales is crucial to refine the government’s drainage reuse strategy and reduce the adverse effects on agricultural productivity, lagoon ecology, and human health. The study investigates the drainage system of the Meet Yazid study area (82,740 ha) located in the upper central part of the Nile Delta. The parameters measured were electrical conductivity (EC), dissolved oxygen (DO), pH, and temperature. Results showed that salinity and quality of drainage water in the Nile Delta vary highly with space and time. The secondary drains exhibited the highest variability of salinity compared with main drains and subsurface drainage collectors because they accumulate salts from deeper soil layers and seepage of saline groundwater at the time of low flow discharge. In secondary drains, the salinity increased up to four times that of drainage water coming from the collectors. Moreover, DO values were most of the time not meeting standards for reuse in irrigation, especially at main drains that collect not only agricultural drainage but also untreated household sewage water. |
| Databáze: | OpenAIRE |
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