HumeGard Technical Manual

7/31/2019 HumeGard Technical Manual

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HumeGard GPT technical manual

Issue 1


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Contents

The HumeGard GPT 1

System operation 2

Bypass chamber 2

Treatment chamber 2

Independent verication testing 3

System options 4

Variants 5

Inundation/tidal applications 6

Design inormation 7

Conguration o the stormwater system 7

Location in the stormwater system 7

Catchment area 7

Sizing the HumeGard GPT 7

MUSIC/pollutant export model inputs 7

System installation 8

System maintenance 9

FAQs 10

Reerences 10

Humes Water Solutions 11

Appendices 12

Precast solutions 31

Contact inormation 32


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HumeGard GPT 1

HumeGardGPT

The HumeGard system is a Gross Pollutant Trap (GPT) that is specically designed

to remove gross pollutants and coarse sediments 150 microns, rom stormwater

runo. A wide range o models are available to provide solutions or normal and

super-critical fow conditions.

The HumeGard GPT

The patented HumeGard GPT incorporates a unique

foating boom and bypass chamber to enable the

continued capture o foating material, even during peak

fows. The conguration also prevents re-suspension

and release o trapped materials during subsequentstorm events.

The HumeGard GPT is designed or residential and

commercial developments where litter and sediment are

the target pollutants. It is particularly useul in retrot

applications or drainage systems on fat grades where

low head loss requirements are critical, and in high

backwater situations.

The value o the HumeGard GPT has proven it to

be one o the most successul treatment devices in

Australia today:

The system provides high perormance with negligible

head loss

The HumeGard GPT has a head loss k actor o 0.2,

important or retrot and surcharging systems.

It captures and stores a large volume o pollutants

For pollutant export rates reported by Australia Runo

Quality (1 m3

/hectare/year), the HumeGard GPT issized or maintenance intervals up to annual durations.

It uses independently proven technology

The system was developed and tested by Swinburne

University o Technology, Australia, in 1998, to

demonstrate compliance with operational criteria rom

the Victorian EPA.

It has low operational velocities

Flow velocity in the storage chamber is


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2 HumeGard GPT

Treatment chamber

1. Once diverted into the treatment chamber, the

fow continues underneath the internal bafe wall,

passes through the stainless steel comb and fows

over the fow controlling weir to the outlet.2. Pollutants with a specic gravity less than water

(S.G.1) settle to the

bottom o the chamber. The design and depth o

the chamber minimises turbulent eddy currents

and prevents re-suspension o settled material.

The comb prevents any neutrally buoyant litter in

the treatment chamber rom escaping under the

bafe wall.

Figure 1 Operation during design ow conditions

System operation

The HumeGard GPT utilises the processes o physical

screening and foatation/sedimentation to separate the

litter and coarse sediment rom stormwater runo. It

incorporates an upper bypass chamber with a foatingboom that diverts treatable fows into a lower treatment

chamber or settling and capturing coarse pollutants

rom the fow.

Bypass chamber

1. Stormwater fows into the inlet (boom) area o the

bypass chamber (reer to Figure 1).

2. During fows up to and including the designtreatment fowrate, the angled boom directs the

total fow into the storage/treatment chamber.

3. During higher fow conditions, the angled boom

continues to direct all foating litter rom the bypass

chamber into the storage/treatment chamber. The

inlet area o the bypass chamber foor is angled

towards the treatment chamber to ensure the bed

load sediment material continues to be directed

into the storage chamber even when the boom

is foating.

4. At peak fows, the boom remains semi-submerged

and enables excess fow to pass underneath,

regulating the fow into the storage/treatment

chamber. This ensures that higher fows, which

could otherwise scour and re-suspend previously

trapped materials, are not orced into the storage/

treatment chamber. The foating boom bypass

ensures previously trapped foating materials are

retained. Each HumeGard GPT is designed to

achieve an operating velocity below 0.2 m/s through

the storage chamber to ensure the settling o coarse

sediment and keep the comb clean.


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HumeGard GPT 3

HumeGardGPT

Independent verifcation testing

Laboratory and eld testing o the HumeGard GPT or

hydraulic perormance and litter capture was conducted

in Australia by Swinburne University o Technology,

during 1996 and 1998.

Laboratory and eld testing (Waste Management

Council o Victoria 1998, Trinh 2007, Woods 2005,

Swinburne University o Technology 2000) has proven the

perormance outlined in Table 1 below.

Table 1 HumeGard GPT perormance summary

Pollutant Removal efciency Details

Gross pollutants

(litter, vegetation)

90% Annually

Sediment 99% Prior to bypass, or >150 micron particles

85% Annually (including bypass)

Hydrocarbons 90% In an emergency spill event

Nutrients (TN, TP) 20% Particulate-bound

Notes:

1. Nutrient removal is infuenced by individual catchment characteristics and partitioning between dissolved and particulate nitrogen.2. For urther details on perormance testing contact Humes Water Solutions.3. Gross pollutant traps are not specically designed to capture hydrocarbons, though may do so during emergency spill events. When this

occurs, maintenance is required immediately.4. The unique design o the HumeGard foating boom allows it to be modied to treat higher fows and capture more gross pollutants and

sediment on request.


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System options

A wide range o sizes are available to suit catchment

pollutant generation rates and Water Quality Objectives

(WQO). Table 2 belowpresents the standard model

dimensions and total pollutant capacities. Werecommend that designers contact Humes Water

Solutions or detailed sizing on each project and or

advice with larger units.

Pollutant export rates detailed in Australian Runo

Quality (Engineers Australia 2006) suggests that a typical

urban catchment will produce 1 m3/hectare/year o

gross pollutants and sediment. Humes Water Solutionsadvises that this be taken into account when selecting an

appropriate model.

Table 2 HumeGard model range and dimensions

HumeGard

model

Pipe diameter or box

culvert width

(mm)

Width

(m)

Length

(m)

Depth rom pipe

invert

(m)

Total pollutant

capacity

(m3)

HG12 300 - 375 1.8 2.0 1.39 2.0

HG15 450 - 525 1.8 2.0 1.36 2.0

HG18 525 - 675 2.0 2.1 1.10 2.5

HG22 675 - 825 2.5 2.5 1.25 6.0

HG24 600 - 825 2.7 2.5 1.70 6.8

HG27 750 - 900 3.0 2.5 1.60 6.7

HG30 750 - 900 3.4 2.5 2.20 10.6

HG30A 900 3.4 2.5 1.90 9.7

HG35 900 3.9 2.5 2.00 11.3

HG35A 1,050 3.9 2.5 1.80 10.2

HG40 900 4.4 2.9 2.00 14.5

HG40A 1,050 4.4 2.9 1.80 13.2

HG40B 1,200 4.4 2.9 1.60 8.9

HG45 1,200 4.9 2.9 2.10 18.3

HG45A 1,350 4.9 3.2 1.90 18.0

HG50 and larger >1,500 5.3 3.5 2.00 >20.0

Note:The unique design o the HumeGard foating boom allows it to be modied to treat a wide range o fowrates. Contact Humes Water Solutions

or details on the model to suit your project.

4 HumeGard GPT


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Variants

A number o additional innovations have been made to

the HumeGard GPT to acilitate their eective operation

in a wider range o applications:

Super-critical HumeGard GPT designed to operate

under supercritical fow conditions in steep, high

velocity drainage networks.

Angled HumeGard GPT designed to replace a 45

or 90 junction in a drainage network.

Dual outlet HumeGard GPT designed to divert the

treatment fow to downstream natural Water Sensitive

Urban Design (WSUD) elements such as wetlands and

bio-retention whilst bypassing excess fows through a

second outlet.

Super-critical HumeGard GPT

The super-critical HumeGard GPT (reer toFigure 2)

was borne out o the original HumeGard GPT, with

modications to deliver even greater perormance

under super-critical fow conditions. This model

replaces the foating boom with a broad-crested weir

that diverts the treatment fows into the treatment

chamber under super-critical fow (Fr>1) conditions

without creating hydraulic jumps and adversely

impacting on perormance.

Flow into the treatment chamber passes through a

stainless steel screen at a velocity


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Angled HumeGard GPT

The angled HumeGard GPT (reer toFigure 3), was

developed to acilitate the replacement o junction

pits while still providing the treatment capabilities o

the original HumeGard device. These units simply

alter the outlet location to allow or a change o pipedirection o 45 or 90. The Angled HumeGard GPT

can be supplied in any o the standard unit sizes,

however, the designer must allow or a minor head

loss actor k o 1.3 instead o 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 o natural

WSUD options such as constructed wetlands, ponds,

lakes, and bio-retention systems.

The units are designed such that one outlet conveys

the treated fow into the natural WSUD measure and

the standard outlet bypasses the excess fow around

the downstream system (reer to Figure 4). Dual Outlet

HumeGard units are available in the same sizes as the

standard HumeGard units (reer Table 2 on page 4).

Figure 4 Dual Outlet HumeGard GPT

Inundation/tidal applications

The boom o the HumeGard GPT enables the capture

o foating pollutants even at peak fows, oten when

other xed weir devices are in bypass mode. This

unique eature also makes the HumeGard GPT ideal

or applications that are subject to both tidal and tail

water eects.

In tidal applications the foating boom eectively traps

the foating pollutants and prevents the loss o the

gross pollutants rom the system. In xed weir devices,

previously trapped foating litter may be backwashed out

o the GPTs during the rising phase, to later bypass the

GPT during the alling phase o the tide. As this happens

twice daily, spring tides could quickly empty devices

relying upon a xed weir.

Marine grade 316 stainless steel is used or all internals in

devices installed in tidal applications. In acidic/aggressive

environments, these may also be epoxy-coated. Contact

Humes Water Solutions or specic designs to suit

these applications.

A plinth can also be added to the alse foor under the

boom to ensure sediment loads are captured during

inundation.

Figure 3 Angled HumeGard GPT

6 HumeGard GPT


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Design inormation

To design a system suitable or your project it is

necessary to review the conguration o the stormwater

system, the location and purpose o other stormwater

management (WSUD) controls, the catchment area andthe hydrology.

Confguration o the stormwater system

The conguration o the stormwater system is important

since the HumeGard GPT operates with an in-line, 45

or 90 alignment. Inlet pipe grades between 0.5% and

5% are recommended or at least ve pipe diameters

upstream o the HumeGard GPT. The pipe grade andfow velocity will determine whether a super-critical unit

is required.

Location in the stormwater system

Depending upon the site, the GPT can be oriented to

have the treatment chamber on the let or right side o

the pipe to suit constraints. Humes Water Solutions can

work closely with stormwater designers to select the

appropriate location and orientation or their system.

Catchment area

Research presented in Australian Runo Quality

(Engineers Australia 2006) concluded that roughly

1 m3/hectare/year o gross pollutants and sediment

could be expected rom a typical residential catchment.

Thereore, GPTs designed or an annual maintenance

interval should have a pollutant storage capacity roughly

equal to the number o hectares o catchment it treats

(e.g. 10 hectare catchment = 10 m3 pollutant storage).

Sizing the HumeGard GPT

The large storage volumes o the HumeGard GPT

enables more pollutants to be captured beore

maintenance is required, which greatly reduces its

liecycle costs. In accordance with accepted hydraulicprinciples the larger volumes in the HumeGard GPT

results in lower velocities through the device, minimising

scour and re-suspension o sediment.

Humes Water Solutions has developed a design

request orm (see page 30) or stormwater designers to

complete and return to obtain a detailed design o the

appropriate device.

MUSIC/pollutant export model inputs

Many local authorities utilise MUSIC or other pollutant

export models to assist in stormwater treatment train

selection, and recommend generic inputs or GPTs.

Considering these against the independent research

results, the ollowing conservative removal eciencies

(reer to Table 3 below) are recommended or the

HumeGard GPT on an annual basis (i.e. no bypass).

Table 3 MUSIC inputs or the HumeGard GPT

Pollutant Removal efciency

Gross pollutants

(litter, vegetation)

90%

TSS 50%

Nutrients (TN, TP) 20%

HumeGard GPT 7

HumeGardGPT


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System installation

The installation o the HumeGard unit should conorm

to the local authoritys specications or stormwater

pit construction. Detailed installation instructions are

dispatched with each unit.

The HumeGard unit is installed as ollows:

1. Prepare the excavation according to plans.

2. Prepare the geotextile and aggregate base.

3. Install the main treatment chamber section.

4. Install the main bypass chamber

section/s (i required).

5. Fit the stainless steel comb (i required).

6. Connect the inlet and outlet pipes.

7. Place the main chamber lid.

8. Install the rame and access covers.

9. Backll to specied requirements.

8 HumeGard GPT

Top:Preparing theaggregate base(Step 2)

Middle:Installing the mainbypass chamber(Step 4)

Bottom:Placing the mainchamber lid (Step 7)


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System maintenance

The design o the HumeGard GPT means that

maintenance is best perormed by vacuum trucks or

removable baskets (available upon request), both o

which avoid entry into the unit.

Removable combs, step irons, and additional access

covers can be designed upon request.

A typical maintenance procedure includes:

1. Remove access covers.

2. With a vacuum hose, remove the foating litter rom

the treatment chamber.

3. Determine the depth o water and sediment layers.

4. Insert sluice gate into the upstream manhole.

5. Decant water rom the treatment chamber

into the upstream manhole until the sediment

layer is exposed.

6. Remove the sediment layer with the vacuum hose;

jet with a high pressure hose i required.

7. Remove sluice gate rom the upstream manhole and

allow water to return to the HumeGard GPT.

8. Replace access covers.

HumeGard GPT 9

HumeGardGPT

Let:Floating littercaptured in the

treatment chamber


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FAQs

Can the boom become stuck?

The smallest boom weighs 80 kg. Unless there is a

large branch, car wheel, or other large item carried

through the drainage network, the mass o the boomwill ensure it returns to the foor.

Will the gross pollutants bypass when the

boom oats?

All treatment measures are designed to treat a specic

fow. Once this is exceeded, any entrained pollutants

in the fow will bypass the treatment chamber. Oten

this is less than 5% o the annual load. Unlike xed

weir devices foating material is still retained behind

the boom even during bypass.

Will the retention o water in the treatment chamber

lead to the release o nutrients as pollutants

break down?

Over time, captured organic materials will breakdown

and release nutrients in all treatment measures

whether natural or manuactured. As part o a

treatment train, downstream vegetated measures

can remove the small proportion o nutrients released

during dry weather fows. A regular maintenance

program will reduce the amount o breakdown

occurring.

What is the design lie o a HumeGard GPT?

The entire product is designed to last a minimum o

50 years.

Why is the HumeGard GPT larger than other GPTs?

The design o the HumeGard GPT is to ensure a

velocity through the treatment chamber


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HumeGard GPT 11

HumeGardGPT

Humes Water Solutions

Humes Water Solutions is a specialist division within

the Humes business, dedicated to the provision o

stormwater treatment, harvesting and reuse, and

detention solutions.

Our team has been developed to provide an unparalleled

depth o knowledge and experience or our customers,

which takes Humes Water Solutions beyond the

traditional barriers o company-based solutions.

A combination o graduate and post graduate personnel

with working backgrounds in the private and public

sector ensures the delivery o well-measured and

practical advice or our customers.

We are dedicated to the development and protection

o our water resources and to this end, we undertake

rigorous research and development o our products, stay

abreast o stormwater issues and solutions around the

world, and publish peer-reviewed technical papers on

issues relevant to the stormwater industry.

As a part o the Humes business, Humes Water Solutions

has access to a national inrastructure, a dedicated

engineering design team, and over 100 years design,

manuacturing and construction experience.

Humes now operates 16 accredited plants (ISO9001)

and 20 sales oces to provide a truly national ootprint

and meet the needs o our customers irrespective o

their location.

Our range o stormwater solutions also includes our

multi-award winning* RainVault harvesting and reuse

system, and the new StormTrap detention system.

For Humes and its parent company, Holcim Ltd,

sustainable development is a key priority. Our stormwater

treatment products demonstrate our commitment to

protecting the environment.

For more inormation on any o our products, or or a

selection o technical papers published by Humes Water

Solutions, please visit us at humeswatersolutions.com.au.

*

2008 Winner - Excellence in Stormwater Harvest & Reuseor the Riverstone Crossing RainVault rom the StormwaterIndustry Association.

2008 Fieldorce Environmental Product o the Year Award romthe Master Plumbers and Mechanical Services Association

o Australia. 2006 CivEnEx - Most Innovative Product.


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Appendices

HumeGard GPT technical drawings

HumeGard GPT design request orm

12 HumeGard GPT


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HumeGard

system design request formProject information

Date: Total drainage area: Hectares

Project number: Impervious %

Project name: Upstream quantity control: YES NO

City/Town: Is the unit submerged: YES NO

Development type: Describe land cover:

State: Describe land use:

1. Water quality objectives

Units are sized for Gross pollutant and TSS removal.

TSS% annualremoval

Gross pollutants% annualremoval

2. Pipeline details

Pipe diameter/RCBCdimensions

Pipe grade and type(e.g. uPVC/RCP)

Velocity

Inlet IL

Design SL

Design headloss (k) factor

Treatment flowrate (L/s)

Pipefull flowrate (L/s)(circle one)

Q2 Q5 other___

3. Outlet configuration (circle one)

Standard Angled Dual

4. Orientation (circle one)

5. Unit type (circle one)

Traditional(floating boom)

Super-critical(broad-crested weir)

Notes/instructions__________________________________________

__________________________________________

__________________________________________

__________________________________________

__________________________________________

__________________________________________

__________________________________________

__________________________________________

__________________________________________

__________________________________________

HumeGard system design request orm HumesHolcim (Australia) Pty LtdABN 87 099 732 29718 Little Cribb stMilton QLD 4064

Australia

Phone 1300 361 601

Fax (07) 3364 2835www.humes.com.au

Storage let Storage right


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HumeGard GPT 31

HumeGardGPT

Precast solutions

Stormwater

Stormwater treatment

Primary treatment

HumeGard Gross Pollutant Trap

Secondary treatment

HumeCeptor hydrodynamic separator

Tertiary treatment

The HydroFilter system

Detention and inltration

The StormTrap system

Soakwells

Harvesting and reuse

The RainVault system

The ReserVault system

The RainVault Mini system

Precast concrete cubes

Segmental shats

Precast concrete tanks above ground

Stormwater drainage

Steel reinorced concrete pipes trench

Steel reinorced concrete pipes salt water cover

Steel reinorced concrete pipes jacking

Corrugated Metal Pipe (CMP)

Box culverts

Uniculvert modules

Headwalls

Stormwater pits

Access chambers/Manholes

Kerb inlet systems

Floodgates

Geosynthetics

Sewage transer and storage

Bridge and platorm

Tunnel and shat

Walling

Potable water supply

Irrigation supply

Trafc management

Cable and power management

Rail

Livestock management

Top:The StormTrap

system

Middle:

The RainVaultsystem

Bottom:Segmental shat


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National sales 1300 361 601

humeswatersolutions.com.au

[email protected]

Contact inormation

Melbourne

Ph: (03) 9360 3888

Fax: (03) 9360 3887

Tasmania

Invermay

Ph: (03) 6335 6300

Fax: (03) 6335 6330

South Australia

Adelaide

Ph: (08) 8168 4544

Fax: (08) 8168 4549

Western Australia

Gnangara

Ph: (08) 9302 8000

Fax: (08) 9309 1625

Perth

Ph: (08) 9351 6999

Fax: (08) 9351 6977

Northern Territory

Darwin

Ph: (08) 8984 1600

Fax: (08) 8984 1614

Head Ofce

18 Little Cribb St

Milton 4064 QLD

Ph: (07) 3364 2800

Fax: (07) 3364 2963

Queensland

Brisbane/Gold Coast

Ph: (07) 3866 7100

Fax: (07) 3866 7101

Bundaberg

Ph: (07) 4152 2644

Fax: (07) 4152 5847

RockhamptonPh: (07) 4924 7900

Fax: (07) 4924 7901

Sunshine Coast

Ph: (07) 5472 9700

Fax: (07) 5472 9711

Toowoomba

Ph: (07) 4694 1420

Fax: (07) 4634 3874

Townsville

Ph: (07) 4758 6000

Fax: (07) 4758 6001

New South Wales

Canberra

Ph: (02) 6285 5309

Fax: (02) 6285 5334

Graton

Ph: (02) 6644 7666

Fax: (02) 6644 7313

Kempsey

Ph: (02) 6562 6755

Fax: (02) 6562 4235

Lismore

Ph: (02) 6621 3684

Fax: (02) 6622 1342

NewcastlePh: (02) 4032 6800

Fax: (02) 4032 6822

Sydney

Ph: (02) 9832 5555

Fax: (02) 9625 5200

Tamworth

Ph: (02) 6763 7300

Fax: (02) 6763 7301

Victoria

Echuca

Ph: (03) 5480 2371

Fax: (03) 5482 3090

32 HumeGard GPT


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National sales 1300 361 601

humeswatersolutions.com.au

[email protected]

A Division o Holcim Australia

Documents

HumeGard Technical Manual