In this study, three waterproofing and drainage optimization schemes were studied using numerical simulation and model tests. An effective method of alleviating these problems is the adjustment of the tunnel drainage scheme.
#Underpass drainage channels series#
150 ISSN: 1866-6280 Subject: drainage, drainage channels, karsts, mathematical models, rain Abstract: In the presence of heavy rainfall on the earth’s surface, a series of water-induced problems often appear in karst tunnels, such as lining cracks and invert uplift. Llamas St.Research on waterproofing and drainage optimization scheme for karst tunnel lining in water-rich areas Author: Dongping Zhao, Haobo Fan, Lingli Jia, Yuxiang Song Source: Environmental earth sciences 2021 v.80 no.4 pp. It was built to decongest traffic at the intersection of N. The construction of the P700 million Mambaling underpass started in 2017. He said they had also been apprehending residents who violated environmental laws. He said they had been conducting cleanup operations every Saturday to minimize flooding in the barangay. He said it takes them up to two days to clean one manhole, usually collecting around 50 sacks of garbage in each manhole.ĭEPW head Kenneth Carmelita Enriquez, for her part, said they have not received any complaints from barangays affected by the flooding.īut Mambaling Barangay Captain Gines Abellana pointed to an “unfinished” drainage project in the area, which causes flooding.Ībellana said they had been requesting the DPWH 7 to address the problem since last year, adding that he is glad the City plans to review all drainage systems in the city. He said the agency and the Cebu City Department of Engineering and Public Works (DEPW) have been declogging 30 manholes in the area as a temporary solution to the flooding problem.
The project engineer said pumps are installed in the underpass that automatically turn on if the water reaches a certain level.
Meanwhile, dela Cruz said the DPWH 7 deployed two persons to monitor the area for potential flooding.
“The ROW should be given importance because that still has to undergo expropriations, which take time,” he said.īased on their experience, “the result was not good” if the construction started without settling ROW concerns first, he said, adding that work on improving the drainage system must be continuous.Īs for flooding in the area, he said water inundates the roads on either side of the tunnel but it doesn’t flood the tunnel itself. in Barangay Basak Pardo.ĭela Cruz said the two projects were delayed because of road right-of-way (ROW) concerns, adding that the bidding for the P15 million project was declared a failure after the ROW concerns were not solved. So we just proceeded with the construction of the underpass,” said dela Cruz.Īnother project worth P18 million will also be used to improve the drainage system perpendicular to the underpass in the area near Shopwise.
“Supposed to be, we have a project for the widening to include the drainage system there, but there was a failure in bidding. They said flooding in the area had gotten worse since the underpass was built. Several netizens posted photos on social media showing waist-deep waters in the barangay. Heavy rains brought about by tropical storm Liwayway flooded parts of Metro Cebu, including the vicinity of the Mambaling underpass in Cebu City, on Sept.
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