I'm seeing more and more instances recently of poured concrete retaining walls without weep holes, which are coming under hydrostatic load from rising groundwater tables, and then leaking through cracks to damage floor level condos and the like. I understand that normally you'd install a weep hole to tie in to porous backfill behind the retaining wall that collects water and helps convey it to the weep hole without pulling sediment / backfill from behind the wall. In cases where a weep hole does not exist at all, and a maintenance contractor needs to drill one to relieve hydrostatic pressure behind the wall and dry the backfill out, what's the best procedure? I worry that if I tell a maintenance contractor to simply drill a hole through the wall, that the weeping might advect sediment through the hole and create a problem. Is there a standard practice used for retrofitting weep holes that handles this? Any advice on weep hole spacing?
Thanks in advance.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
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