Tender: Aberford Park Brook and Lake Improvement Works – Borehamwood (Hertsmere Borough Council)

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Hertsmere Borough Council is seeking a contractor to undertake the design, permitting and implementation of brook and lake improvement works within Aberford Park, Borehamwood, Hertfordshire. The watercourse is part of Tykes Water and receives surface water runoff from surrounding roads and residential areas; an oil interceptor at the head of the brook has been decommissioned by the Environment Agency and surface water currently bypasses the interceptor and discharges directly into the lake. Major restoration works were previously completed in 1999 and 2008, including desilting, reprofiling, fountain installation and planting, with sediments from those works retained and beneficially reused, and approximately eighteen years have elapsed since the last major intervention. The Council has identified issues requiring remediation including increased silt accumulation reducing lake depth, malfunctioning fountains due to sediment, algal blooms and associated odours in summer months, and excessive reed growth resulting from low flows and seasonal water level variations.