For a flume or weir to work correctly, the flow must be sub-critical and tranquil. Many times, however, site conditions don’t allow the development of this type of flow. For those occasions Openchannelflow has developed fiberglass Energy Absorbing Manholes.
Fiberglass Energy Absorbing Manholes are a cost effective way on slowing the velocity of water through a pipe system in a way that is cost effective and which requires little in the way of line downtime.
Energy Absorbing Manholes can be placed directly upstream of Packaged Metering Manholes. The flow is slowed and conditioned in the Energy Absorbing Manhole and then smoothly flows into the Packaged Metering Manhole to be measured.
Energy Absorbing Manholes eliminate the need for costly line excavations, replacement, or resloping. Installation can also be concurrently with a Packaged Metering Manhole – reducing labor and machinery costs.
Energy Absorber manholes are available in sizes from 48 to 92-inches [1.22 to 2.34 m] in diameter and in depths up to 35-feet [10.7 m].