The City had been monitoring an area of erosion and sedimentation due to stormwater runoff adjacent to Lotus Lake, abutting 489 Pleasant View Road. The site has experienced an acceleration of erosion leading to undercutting of an embankment, scouring of a ravine and the undermining of mature trees.
The City was aware of the need for stormwater improvements in an area near Lotus Lake abutting 489 Pleasant View Road. The issue arose due to overland flow of stormwater--or sheet flow--that had been eroding and undercutting an embankment supporting Pleasant View Road. Observations made in 2017 found that the problem had accelerated, and staff determined that the need for repairs and mitigation of the erosion could not wait until the scheduled CIP date. Due to the severity of the erosion and potential hazards to Pleasant View Road and Lotus Lake, the City decided the project needed to be completed in the summer of 2020. The construction was outside of the school year so as to not impact school buses. The City coordinated this work with stakeholders, including the property owner and Riley Purgatory Bluff Creek Watershed District (RPBCWD).
The Pleasant View Road Drainage Improvement Project (Project No. 19-04) included the removal of old and failing storm pipes, the installation of two new pre-cast concrete storm structures, and the installation of new reinforced concrete pipe. Additionally, the failed and eroded areas was restored and stabilized, and a rock channel leading to the lake was constructed. These improvements will help ensure that the stormwater runoff will be properly conveyed to Lotus Lake, with the additional benefit of reducing total suspended solids (TSS) and other pollutants.