The tunnel will operate as an "inverted siphon." During normal flows, water will move slowly through the tunnel and sediment will fall to the bottom of the tunnel. The sediment will be removed from the tunnel during normal maintenance activities. Trash will be collected at the tunnel inlet and at screened storm drains. During dry conditions, water will be pumped from the tunnel at the inlet and discharged into Waller Creek to maintain a constant flow in the creek, improving water quality and the appearance of the creek.