Overview 

The Hydro-Static® Screen offers an economically sustainable screen for combined sewer overflow (CSO) sites with infrequent overflows, but at which environmental protection is still a concern. A non-powered screening technology, the Hydro-Static® Screen provides effective gross solids and floatables capture and works with small flows and small budgets.

The Hydro-Static® Screen is available in two configurations, either as an Up-Flow screen or a weir-mounted Through-Flow screen. With no moving parts and flow-modifying components in the up-flow configuration to provide partial cleaning, maintenance is kept to a minimum. To protect against corrosion components are typically supplied in grade 304 stainless steel as standard, and the mesh screen panels are coated in a non-stick polymer to reduce blinding.

Configurations

Up-Flow

The Hydro-Static® Screen is mounted horizontally over the dry weather flow channel so that the flow passes up and through the screen in a storm event.

Through-Flow

The Hydro-Static® Screen is offset from the vertical to encourage screenings to drop away from the corrugated mesh once the storm has subsided.

Applications

  • CSO sites with infrequent spills
  • Floatables control within collection systems
  • Retrofits or new CSO screening facilities

You can watch a brief video demonstrating the Hydro-Static® Screen here.

Designed for

Coarse particles

Low flow

Trash & floatables

Benefits

Get economical, effective CSO screening

The Hydro-Static® Screen provides effective gross solids and floatables capture and works with small flows and small budgets. Mesh screen panels are coated in a non-stick polymer and corrugated to increase flow-through capacity.

Minimize maintenance requirements

The Hydro-Static® Screen has no moving parts and requires no power to operate. Patented flow-modifying components provide partial cleansing of the screen, and a polymer-coated mesh reduces the risk of blinding.

Install quickly and easily 

Components can be pre-installed in a precast concrete chamber to enable swift installation on site.

 

How it works

  1. During dry weather conditions the flow to the treatment works will pass underneath the screens in the dry weather flow channel.

  2. In a storm event the inflow rate to the chamber will exceed the outflow rate causing water levels to rise within the chamber and spill through the screens (green arrows).

  3. The Hydro-Static® Screen is mounted over the dry weather flow channel so that the flow passes up and through the screen during a storm event. Solids and floatables are trapped below the screen and returned to the sanitary continuation flow (brown arrow). Screened effluent is discharged to a receiving waterway (blue arrow).

  4. An emergency overflow weir is incorporated into the screen should the peak design flow be exceeded.

Technical information

Loading rate

The recommended design loading range is 73 to 143 gal/min/ft2 (nominal value: 110 gal/min/ft2).

Headloss

Headloss ranges from 1.5 in at 73 gal/min/ft2 to 4 in at 143 gal/min/ft2.

Screen weight

The weight of a standard panel (4 ft x 2 ft) is 44 lbs. This equates to 56.5 lbs of plan area.