Abstract
The discharge of construction dewatering flows to the storm drainage network for disposal is a common activity in Qatar. The Dupuit empirical approach was utilized to establish various hypothetical dewatering scenarios on the basis of site classifications, which were modeled on 4 Case Study Areas of Doha’s Existing Surface Drainage Network in order to study the impact of dewatering discharge against an established baseline. The simulations were undertaken using InfoWorks Integrated Catchment Modeling (ICM) software for critical and non-critical rainfall events. The results indicated significant localized flooding in excess of the baseline conditions for scenarios exceeding 0.5 m 3 /sec flows, while individual catchments demonstrated variations and sensitivities on the basis of catchment properties and rainfall events. It is evident that dewatering discharge under unpredictable rainfall events poses various levels of risk to the city’s infrastructure, which is further exacerbated due to the massive scale of construction activity in the country and the rising ground water table in Greater Doha Area basin.
Highlights
The groundwater tables in Qatar have been depleting in its two major inland basins, namely the northern and southern basins, the Doha basin area has seen a significant increase in the groundwater table [1]
This is primarily due to two major reasons, the first is due to rapid urbanization, causing land use changes & over-irrigation using treated wastewater (TSE) [2, 3], the second is due to increased saline intrusion from the sea [1, 4]
The model was run for a total of 16 rainfall events to analyze and define the baseline conditions, prior to the addition of any dewatering flows
Summary
The groundwater tables in Qatar have been depleting in its two major inland basins, namely the northern and southern basins, the Doha basin area has seen a significant increase in the groundwater table [1]. This is primarily due to two major reasons, the first is due to rapid urbanization, causing land use changes & over-irrigation using treated wastewater (TSE) [2, 3], the second is due to increased saline intrusion from the sea [1, 4]. Discharge to sea via Surface and Groundwater Network 2.
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