Two further days of roadworks are expected to determine the cause of flooding in Piccotts End.
Matthew Kelley, divisional manager of Herts highways contractor Ringway, said: “We spent two days on site cleaning and investigating the condition of the drainage system using CCTV technology.
“This has taken longer than anticipated due to the extra time required to clean existing pipes. “
“We are currently programming further work to investigate the rest of the system and will notify residents.”