The Design of a Combined Wastewater and Stormwater Collection Network in Sabastia

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Areej Waleed Zakarneh
Yara Kazem Azem
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Water is one of the most prominent blessings that God bestowed upon us. It is a basic necessity and no living creature on this Earth can survive without it. Nowadays, with the increasing population and consumption of water, that in the light of the global warming we face, would leave us with scarcity of water. In addition, consumption of water is critical due to the fact that it produces sewage, and how we choose to dispose it is one of our main focuses, along with the discharge of the stormwater. It came to our attention that most areas in the West Bank do not have the proper collection and drainage of stormwater and wastewater via wastewater networks. Instead, cesspits are used to collect wastewater, and the stormwater runs in the streets without being collected. In addition, cesspits are not the proper way of disposal due to the negative impacts on the environment, as they contribute to the environmental pollution and mainly to the groundwater. In the Village of Sabastia, which is considered one of the most important archaeological monuments in Palestine, the presence of many cesspits is not only a health concern but it also would pose a great threat to the remains and ruins that exist beneath the ground, and the running stormwater, over time would cause erosion to the remains that are exposed to the elements. So, for our first graduation project we decided to design a wastewater collection network for the sake of the safe disposal and conveyance of sewage in the old town of Sabastia. For our second project, we combined the said network with a stormwater collection network. For our study we will follow the appropriate methodology to achieve the right and affordable design to help with that. We are going to use ArcGIS software to study the area. The plans provided to us by the Municipality of Sabastia that contain the roads and contours of the village. In the design of the wastewater collection network, we collected information and data on the monthly and yearly water consumption and thereafter the wastewater load was estimated. Next, the wastewater network was laid out by 9 locating the manholes throughout the roads of the old town, where sewers will be sketched properly connecting between the manholes. We then used SewerCAD software to design the network with the readily available and processed data. In this part we are going to design the combined network for stormwater and wastewater, we will be using the data used in the first part regarding the maps, the contours and the layout of the network. The design of the stormwater collection network will depend on rainfall information available for the city of Nablus, the nearest major city to Sabastia and the most similar, we will use the IDF curve for Nablus to determine the rainfall on Sabastia, and continue with the design. In the end, we aspire to achieve a suitable and a safe design at the lowest possible cost that would meet the engineering requirements and constraints, to protect our land and heritage, and to reach a level of no pollution or negative effects, on either the environment or the culture the village holds.