Hidalgo County Precinct 1 Commissioner: Crews working to resolve Mercedes flooding issues 1 day 5 hours 8 minutes ago Thursday, July 08 2021 Jul 8, 2021 July 08, 2021 11:00 AM July 08, 2021 in News - Local Share: Mercedes resident Luis Solis says he saw close to 10 inches of flood water inside his home during Hurricane Hanna Now, his biggest concern is a nearby detention - pond facility that may over flow into his home once again. "We [had] a detention pond built - they started building it in 2018 and it was supposed to take care of the flooding problem,” Solis said of the detention pond sitting between Mile 2 1/2 and Mile 9 in rural Mercedes. “But instead of letting our water come out of our neighborhood into the retention pond, after it gets full it comes back out."