
In the video, two construction workers place fine green mesh beneath a concrete storm drain grate, trim the excess with scissors, and secure it by lowering the grate. While intended to block mosquitoes, this setup traps leaves and mud in heavy rain, causing dangerous street flooding while stagnant water trapped in the mesh actually breeds more mosquitoes. For effective prevention, install stainless steel filters under grates—they resist clogging with 1mm perforations—supplemented by monthly Bti mosquito dunks that kill larvae for 30 days, with simple debris removal every two weeks maintaining full drainage capacity during storm seasons.