Characteristics Of Flow Rate, Head Loss And
Basket Pressure Drop Relationship In A
Rocla Versa Trap (VT) Stormwater Pollutant
Trap (SPT) In A 3-D Laboratory Scale Model
Author(s)
H. K. Saberi & H. Nikraz
Abstract
Rapid development of the big cities and suburbs around the world in the last
century has created a situation in which the main focus of urban rainwater runoff
is the disposal of the stormwater as quickly and efficiently as possible to the
disposal site, without considering the water quality at outfall. This has
contributed to the decline of water quality of the rivers, lakes and other receiving
bodies. Whilst some progress has been made towards the reduction in pollution
at the source, it is the non-point sources of pollution entering the water runoff
system at various points and from different sources that is the most difficult to
monitor and manage.
One of the basic and at the same time major concepts in recent years is to
capture and treat as much of the pollutant as possible which is discharged to the
drainage system at source or possibly close to the source as the first step. One of
the most popular and economical approaches is the use of an off-line stormwater
pollutant trap (SPT).
Recent developments in stormwater quality management have seen the
introduction of SPTs, which are generally the most up-to-date devices designed
to capture and store gross pollutants and some micro-pollutants, for subsequent
removal and disposal.
In this experiment a scale model of a Versa Trap series, a gross pollutant trap
that utilises an upstream diversion weir pit to divert the Design Treatment Flow
(DTF) into a cylindrical treatment chamber which houses a stainless steel basket,
is considered. Treated flow passing through the basket screen is returned via the
exit chamber to the diversion pit downstream of the weir, re-entering the
drainage system. Peak flows in excess of the DTF bypass the diversion pit over
the weir into the pipeline downstream.
A mathematical relationship between the flow rate and head loss across the
basket can be established for the device, which allows the designer to specify a
suitable weir height in the diversion pit and to clarify the allowable range for
removing and cleaning the basket at its optimum maintenance situation.
Keywords: runoff, stormwater, receiving bodies, off line, pollutant trap, gross
pollutant, treatment chamber, diversion pit, weir, head loss.
Keywords
runoff, stormwater, receiving bodies, off line, pollutant trap, gross
pollutant, treatment chamber, diversion pit, weir, head loss.
Related Book
Other papers in this volume
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