ECOSOL SOAKWELL LITTER TRAP

WATER SENSITIVE URBAN DESIGN & CONSTRUCTED WETLANDS

IN-LINE PRIMARY TREATMENT SOLUTION

Increasingly stringent environmental best management practice requires planners and developers to apply a fit-for-purpose treatment-train approach to stormwater treatment to achieve today’s water quality objectives (WQO’s).

Soakwells are designed to provide on-site detention and infiltration of stormwater run-off. The implementation of soakwells enables stormwater runoff from impervious surfaces to infiltrate back into the water table as close as possible to its predevelopment hydrology and is an integral part of today’s urban stormwater best management practice.

The captured stormwater is slowly released into the ground via weep holes or an open base within the soakwell system.  They are generally available as circular steel reinforced pre-cast concrete pits ranging from 600mm to 1800 mm in diameter with depths below surface level of 600mm – 1800mm and with storage volumes up to 4,580L. Generally they are designed to service an impervious catchment area of approximately 375m2.

Essential to maintaining the infiltration properties of your soakwell is regular preventative maintenance and pre-treatment of the stormwater flows.  Ecosol a specialist stormwater filtration provider has designed a purpose built Soakwell Litter Trap for pre-screening of stormwater flows entering your soakwell. The installation of this pre-treatment litter trap within the main soakwell structure significantly enhances the life and infiltration properties of your soakwell.

The Ecosol Soakwell Litter Trap is able to be custom built to suit most diameter soakwells and can be easily retrofitted.  It is designed to capture and retain all pollutants conveyed in stormwater runoff larger than 3mm in diameter. The stainless steel filtration basket is a robust design that will increase the life of the infiltration layer by preventing larger gross litter and vegetation from blinding the porous base of the soakwell.

SOAKWELL LITTER TRAP KEY FEATURES AND BENEFITS

Cost efficient and effective primary treatment solution
Visually unobtrusive, fully self-contained underground system
Easily maintained by vacuum truck
Durable, robust product, engineered for the environment in which it operates

At Ecosol we can site measure, fabricate, install and maintain your Soakwell Litter Trap making the whole process seamless.

The Ecosol Soakwell Litter Trap is able to be custom built to suit most diameter soakwells and can be easily retrofitted.  It is designed to capture and retain all pollutants conveyed in stormwater runoff larger than 3mm in diameter. The stainless steel filtration basket is a robust design that will increase the life of the infiltration layer by preventing larger gross litter and vegetation from blinding the porous base of the soakwell.

Ecosol SOAKWELL LITTER TRAP TYPICAL PRODUCT DIMENSIONS & WEIGHTS
Ecosol Soakwell Litter Trap Typical Product Dimensioning and Weights
Soakwell Diameter (mm)Suits pipe sizes up toSoakwell depth below inlet pipe invert levelMinimum litter trap depth below pipe invert level
mmmmmmmm
600150600300
900150600300
150900600
1501200600
1070225600300
2251200600
1200300600300
300900600
3751200600
3751500750
1500450600300
4501200600
4501500750
1800525600300
525900600
6001200600
6001500750
6001800750
6002400750

Notes:
All Ecosol Soakwell Litter Traps are suspended 300mm above the base of your soakwell floor to enable retained material to drain between rain events.

Ecosol SOAKWELL LITTER TRAP INDICATIVE TREATABLE FLOW RATES & MAXIMUM BY-PASS CAPACITIES
Ecosol Soakwell Litter Trap Indicative Treatable Flow Rates & Maximium By-pass Capacities
Soakwell Diameter (mm)Suit pipe sizes up toSoakwell depth below inlet pipe invert levelDesigned Treatable flow rate1Maximum By-pass Capacity2
mmmmmmlitreslitres
600150600922
150900922
1501200922
10702256001863
22512001863
12003006003080
3009003080
375120041148
375150041148
150045060075241
450120075241
450150075241
180052560082364
52590082364
6001200138520
6001500138520
6001800138520
6002400138520
  1. Treatable Flow Rate (TFR) is the maximum flow the unit can treat without by-pass. It is important to note that the TFR will decline as the basket fills with pollutants.
  2. By-pass capacity is the maximum flow that can pass through a full system. As an indicative guide the system will have a headloss coefficient of approximately 1.3k.

Ecosol recognises that modelling of stormwater treatment systems is an integral part of WSUD engineering procedures today.  To assist you with your next project we are pleased to provide you with some indicative capture efficiency values for the Ecosol Soakwell Litter Trap.

Ecosol SOAKWELL LITTER TRAP CAPTURE EFFICIENCY PERFORMANCE SUMMARY
Ecosol Soakwell Litter Trap Capture Efficiency Performance Summary - 2018
PollutantsPollutant Capture Efficiency (%)Description
Gross Litter98%Anthropogenic material such as cans, bottles, plastic bags and packing material (generally >3mm in diameter).
Vegetation 98%Organic matter such as leaves and grass clippings.
Coarse Sediment 98%Solid material varying in size (generally >3mm in diameter) both mineral and organic.

One of the key advantages of the Ecosol Soakwell Litter Trap is that a vacuum truck can easily remove all captured and retained pollutants.  This eliminates any risks associated with manually handling captured pollutants.    As the Ecosol Soakwell Litter Trap is predominately installed as a dry system there is a reduced likelihood of captured contaminants causing any significant adverse environmental impact or nuisance (such as odours and putrefaction).

The key benefit of this primary treatment device is its low capital cost along with its low ongoing cleaning and maintenance cost.

It is recommended that your Ecosol Soakwell Litter Trap is regularly cleaned out of all retained pollutants and at a minimum should be cleaned every year. Cleaning is by vacuum method using commercial eductor trucks.  Cleaning of the unit is completed from the surface level by moving the snorkel over the retained pollutants.

Ecosol SOAKWELL LITTER TRAP INDICATIVE CATCHMENT SIZE & RECOMMENDED CLEANING FREQUENCIES
Ecosol Soakwell Litter Trap Indicative Cleaning Frequencies - 2018
Ecosol Soakwell Litter Trap DiameterIndicative Inlet Pipe DiameterSoakwell Litter Trap DepthIndicative Maximum Gross Pollutants Holding CapacityOptimal Catchment Area (Ha)Recommended Cleaning Frequency
mmmmm3HaPer Annum
600mm1503000.3391.201
900mm1506000.3811.301
1070mm2256000.5391.801
1200mm3757500.8482.901
1500mm4507501.3204.701
1800mm6007501.9006.901

Cleaning frequencies are based on typical pollution loads of 0.280m3/ha/year for gross pollutants generated on a typical fully developed urban catchment. For larger catchments increase cleaning frequencies may be required

lvenessEcosol Soakwell Litter Trap