Modified Drop-Box Weir, Stainless Steel

The Modified Drop-Box Weir is designed for streams with extreme ranges of discharge and large sediment loads. This is because sediment deposited in the approach to the measuring section can affect approach water velocities and consequently, the rating of the device. Ratings can require corrections for sediment concentrations, complicating the determination of flow rates because concentrations are not always known. Therefore, the Modified Drop Box Weir accurately measures sediment-laden flows at the end of erosion plots and in small stream channels, where prior knowledge of sediment concentrations in a hydrograph is unknown. Maximum flow rate is 14 cfs.

809-090-03 Modified Drop-Box Weir Stainless Steel