16-001014-02A (Ultimate SCMMP)

    • Angled HumeGard® GPT                                          Figure 4 – Dual Outlet HumeGard® GPT
      The angled HumeGard® GPT (refer to Figure 3), was
      developed to facilitate the replacement of junction
      pits while still providing the treatment capabilities of
      the original HumeGard® device. These units simply
      alter the outlet location to allow for a change of pipe
      direction of 45° or 90°. The Angled HumeGard® GPT
      can be supplied in any of the standard unit sizes,
      however, the designer must allow for a minor head
      loss factor ‘k’ of 1.3 instead of 0.2 (which applies to the
      standard HumeGard® GPT design).

    • Dual Outlet HumeGard® GPT
      The Dual Outlet HumeGard® GPT has been designed
      to operate as a diversion structure upstream of natural
      WSUD options such as constructed wetlands, ponds,
      lakes, and bio-retention systems.

      The units are designed such that one outlet conveys
      the treated flow into the natural WSUD measure and
      the standard outlet bypasses the excess flow around           Inundation/tidal applications
      the downstream system (refer to Figure 4). Dual Outlet
      HumeGard® units are available in the same sizes as the        The boom of the HumeGard® GPT enables the capture
      standard HumeGard® units (refer Table 2 on page 4).           of floating pollutants even at peak flows, often when
                                                                    other fixed weir devices are in bypass mode. This
                                                                    unique feature also makes the HumeGard® GPT ideal
    Figure 3 – Angled HumeGard® GPT                                 for applications that are subject to both tidal and tail
                                                                    water effects.


                                                                    In tidal applications the floating boom effectively traps
                                                                    the floating pollutants and prevents the loss of the
                                                                    gross pollutants from the system. In fixed weir devices,
                                                                    previously trapped floating litter may be backwashed out
                                                                    of the GPTs during the rising phase, to later bypass the
                                                                    GPT during the falling phase of the tide. As this happens
                                                                    twice daily, spring tides could quickly empty devices
                                                                    relying upon a fixed weir.


                                                                    Marine grade 316 stainless steel is used for all internals in
                                                                    devices installed in tidal applications. In acidic/aggressive
                                                                    environments, these may also be epoxy-coated. Contact
                                                                    Humes Water Solutions for specific designs to suit
                                                                    these applications.


                                                                    A plinth can also be added to the false floor under the
                                                                    boom to ensure sediment loads are captured during
                                                                    inundation.




6   HumeGard® GPT