U Heights 2022 Flood: The River des Peres Tunnel” We will hear from Mark Holly of the Stormwater Commission. Mark did a computation model of the River des Peres (RdP) channel and tunnel entrance near Kingsland and Vernon. The study was based on estimating the volume of water entering the tunnel during the July 26, 2022 flood. A year after the flood, an MSD subcontractor removed over 500 tons of debris from the tunnel. The study found that a 10% blockage of the tunnel would result in the overtopping of flood water within 1.5 minutes. It implies the need for tunnel maintenance.