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Rehabilitation of Drinking Water Supply System in Kasalinsk, Kazakhstan
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Kasalinsk is situated to the east of Lake Aral, a region with as little as 100 - 200 mm rainfall per year. Decreasing rainfall, increasing water demand for agriculture and cotton fields and the growing population led to a shrinkage of this formerly fourth largest lake on earth to a third of its original area. The existing drinking water supply system could not manage the increasing demand for water also due to corrosion and leaks in the water conduits, which also lead to an increasing water contamination. German KfW financed, within the scope of the Worldbank’s Environmental Protection Program for Kasahkstan, the rehabilitation of the ailing water supply network of the towns Kasalinsk and Novokasalinsk.
DYWIDAG International was awarded this contract in February 2005 and with a construction period of 21 months averted the breakdown of the network.
DYWIDAG International started the works with a complete overhaul of the water treatment plant (383 m³/h) on the River Syrdarya, including filter systems, chlorine dosage, the pumping stations and the water tower. Six pump-stations were rehabilitated and reequipped to ensure the water supply to surrounding villages.
A total of 55 km of drinking water pipes were checked for leaks from the River Syrdarya to and within the towns of Novokasalinsk and Kasalinsk. A new 11.5 km long ringmain DN 250/300 was built around Novokasalinsk.
Within the city, the old steel pipes were replaced by PVC pipes DN 400 (1.0 km). In the town of Kasalinsk, a further 6.5 km of the defective sections of the transport pipeline have been replaced by PVC pipes DN 300.
As part of the project, DYWIDAG International supported the water supply operator, Kasaly Su Kubyrlary, with complex technical support and knowledge, especially with an introduction of a computer-aided management system, laboratory facilities and efficient operation procedures.
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