Figure 6. Example of potential safety hazard due to location of weir and boards

ERDC TN-DOER-T3

January 2001

Figure 6. Example of potential safety hazard due

Figure 7. Example of unlevel weir boards and

to location of weir and boards

uneven effluent withdrawal across

boards

Figure 8. Schematic profile diagram, telescoping weir concept

From 1986 to 1994, the U.S. Army Engineer Waterways Experiment Station (WES), Vicksburg,

MS, and the U.S. Army Engineer District, Norfolk, conceived, designed, constructed, and tested a

1/4-scale model of the first telescoping weir. The concept was originally drafted in 1986, a prototype

model was constructed at WES in 1992, and the first full-size prototype telescoping weir was con-

structed and installed at Craney Island CDF (placement site) in 1996 (Fowler, Vann, and Woodward

1999) (Figure 9).

The major components of the telescoping weir include the following:

Three cylindrical telescoping sections, with the upper section forming the crest of the weir.

Seals to prevent the intrusion of sediment into the weir.

A base section to receive the weir flow and to route it to a discharge pipe.