Drainage investigations in Parsonage Lane have yielded positive results for Hertfordshire County Council. The highways authority has set up roadworks near Plaw Hatch Close to check the condition of the gulley network. The pipes can be damaged by tree roots or collapse through age. The work, set to be completed by January 19, is the start of a two-year cycle. Usually, issues identified during the exploratory work are scheduled for more extensive maintenance in the next financial year. However, a spokesman told the Indie that several defects had been discovered which could be put right immediate…