Functional Checks. Functional Checks On Culverts And Ring Drains 20242027 A Part Of The Canal Structures Of The Munich City Drainage Lies Entirely In The Groundwater Or In Its Fluctuation Range. So-Called Groundwater Siphons Have Been Built As A Measure To Avoid A Damming Up Of Groundwater. Ring Drains Are Installed Around Larger And Deep Structures, Such As The Rainwater Retention Basins Of The Mse. The Function Of The Groundwater Culverts And Ring Drains Must Be Checked At Regular Intervals Prescribed By Water Law. The Functional Checks Include Cleaning And Rinsing Work, Regeneration And The Removal Of Root Ingrowth To Enable Flow Measurements And Camera Inspections.
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