Ja. Millen et al., EXPERIMENTAL EVALUATION OF SEDIMENTATION BASIN PERFORMANCE FOR ALTERNATIVE DEWATERING SYSTEMS, Transactions of the ASAE, 40(4), 1997, pp. 1087-1095
The effectiveness of four sediment removal/water control treatments, e
ach designed to dewater the 155-m(3) sedimentation basin in 24 h, was
evaluated using 100-m(3) inflow hydrographs (35-mm, 2-yr runoff events
) from a 0.4-ha denuded construction site containing 454 kg of sedimen
t. The treatments were a perforated riser alone that discharged 26.1 k
g of sediment and had an overall sediment retention efficiency of 94.3
%; two internal barriers designed to trisect the basin's volume with a
perforated riser significantly reduced the sediment loss below that o
f the perforated riser alone to 20.4 kg; a skimmer alone discharged th
e least total sediment at only 14.3 kg; and trisecting the basin with
barriers, with the skimmer did not improve the capture efficiency of t
he basin over that of the skimmer alone. All treatments removed 100% o
f soil particles and aggregates larger than 75 mu m. Th basin sediment
was completely mixed during the entire inflow/dewatering event and th
e effluent particle size distribution was the same as that observed fo
r the influent sediment smaller than 75 mu m. Particle sizes retained
between 0.1 and 75 mu m ranged from 77 to 100% with the poorest retent
ion in the 6 to 12 mu m range.