CHALLENGE
Rains and flooding had become a continual problem for over two million people living inside the DND (Dhaka-Narayanganj-Demra) region in Bangladesh. Large areas of what was once an irrigation project not meant for habitation turned into residential, commercial and industrial living areas that went underwater almost every monsoon. The unplanned development in the area created a substantial strain on the existing infrastructure of the drainage system for 10,000 hectares of land inside the DND area which resulted in waterlogging even with small amounts of rain. With the inadequate infrastructure, the area was often sitting 10-15 feet below the flood level during the rainy season and failed to pump out rainwater for weeks even after only an hour of rain.
Because of the unplanned growth, and no waste management inside the DND area, about 500 metric tons of waste was produced daily and there was no earmarked area to dispose of the garbage. People frequently threw their garbage and household waste into the canals hampering the flows. The stagnant water posed significant health risks to the inhabitants so planning by the Bangladesh Water Development Board began to build 2 flood water pump stations and 3 flood water pumping plants under the project name Dhaka-Narayanganj-Demra (DND) Drainage development and Sanitation Project – II.
SOLUTION
Commencement of the project began and The Bangladesh Water Development Board’s vision of providing quality infrastructure was handed over to the Bangladesh Army for
facilitation. Challenges were the highly corrosive water that needed to be pumped out of the city that had every type of debris including fibers, sludge, cloths, chemicals, bamboo, solid particles, wood particles, and residential and commercial waste. Working with the Pump Solution Company, M/S Titas Enterprises, the Bangladesh Army chose EVR Products in a successful bid to supply (7) 1400mm Rubber Duckbill Check Valves for the Shimrail Pumping Station at Siddhirganj, Narayanganj.
The 2 pump stations at Shimrail and Adamjinagar were built with a capacity of 38,500 liters and 33000 liters per second respectively. The Shimrail pump station was designed
for operating 7 pumps with a capacity of 5500 liters per second at a 5-meter head. Both station’s pumps were designed for submersible propeller pumps with a discharge tube diameter of 1400mm.
Elasto-Valve Rubber Products proved itself as an industry leader with its ability to provide valves resistant against corrosive chemicals and the ability to withstand the demanding flow specification – earning them acclaim from members of The Bangladesh Army Engineering Department who visited the EVR manufacturing facility in Sudbury. They were also impressed that all products and materials were sourced and manufactured in Canada.
Results
EVR’s rubber “no clog” check valves proved to be the ideal solution for handling stormwater with extreme debris, often referred to as black water. Many competitors offered metal flap gate valves that wouldn’t be suited for this environment. EVR created a lasting solution that is expected to remain maintenance-free for decades. After 3 monsoon seasons, the valves have all operated without any maintenance or blockages. This project has reinforced EVR as the leader of dependable flood control check valves, assisting to improve the environment for the local population.
EVR RUBBER DUCKBILL CHECK VALVES
designed to be efficient, quiet and tough. Requiring no external power sources, thereby reducing operation costs. The valve’s simple designs mean there are no moving mechanical parts to break down or jam, reducing maintenance costs