Document Details

Document Type : Thesis 
Document Title :
The rise of the groundwater level in the city of Jeddah
ارتفاع منسوب المياه الجوفيه في مدينة جدة
 
Subject : Faculty of Earth Sciences 
Document Language : Arabic 
Abstract : Jeddah City, located between latitudes 20˚ 54 ̍- 21˚ 30 ̍ N and longitudes 39˚ 06 ̍ - 39˚ 38 ̍ E, covers an approximate area of about 1650 km2. It is built over an alluvial plain aquifer that has witnessed, over the years, a significant rise in the groundwater table. The rise in water levels has caused roads to collapse and significantly affected the foundation of other civil structures located within the city limits. With a mean annual rainfall of just over 50 mm, it is less likely that the rise in water level could be attributed entirely to the rainfall recharge. In the absence of any cohesive underground stormwater/sewer system for the city, exfiltration from cesspools and the leakage from water supply pipes might be the primary recharge mechanisms responsible for the groundwater rise. In order to determine the annual groundwater rise and to identify the recharge mechanisms, a hydrogeochemical and bacteriological study was conducted for the southern part of Jeddah. After conducting a well inventory, groundwater data from 44 observation wells was obtained and compared with the historic data to determine the rise (or fall) of groundwater. 39 wells were then purged and the groundwater samples were collected for bacteriological and common major and trace ions analyses. Microbacteriological parameters such as total coliform/ e-coli were determined within eight hours of sampling to avoid any contamination. The results of this study indicate that half of the wells located in the study areas registered a rise in the groundwater levels while almost equal number of wells show a fall in the groundwater. On average, short term variations measured over a period of seven months resulted in the fall of groundwater levels by an annual rate of 0.01m. While long-term variations recorded over a period of five years resulted in the net annual rise of groundwater levels by 0.001 m. When compared with depth to water table, an annual rise of 0.05 m was noted. The change in water levels is due to changes being brought by the construction of surface and subsurface drainage networks. Exfiltration of cesspools is the single most reason for rising groundwater levels as indicated by the geochemical and microbacteriological analyses performed on groundwater samples. This has resulted in polluting the groundwater. It is recommended that underground sewage network be established for the entire study area so that the natural groundwater contamination can be averted for the region of South Jeddah. 
Supervisor : Dr. Tariq Javed Shima 
Thesis Type : Master Thesis 
Publishing Year : 1438 AH
2017 AD 
Co-Supervisor : Dr. Ali Mohamed Sobiani 
Added Date : Wednesday, April 5, 2017 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
وليد عبدالله قايدKayed, Walid AbdullahResearcherMaster 

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