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 Urban Asset Solutions 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 | |||
|---|---|---|---|
| Soakwell Diameter (mm) | Suits pipe sizes up to | Soakwell depth below inlet pipe invert level | Minimum litter trap depth below pipe invert level |
| mm | mm | mm | mm |
| 600 | 150 | 600 | 300 |
| 900 | 150 | 600 | 300 |
| 150 | 900 | 600 | |
| 150 | 1200 | 600 | |
| 1070 | 225 | 600 | 300 |
| 225 | 1200 | 600 | |
| 1200 | 300 | 600 | 300 |
| 300 | 900 | 600 | |
| 375 | 1200 | 600 | |
| 375 | 1500 | 750 | |
| 1500 | 450 | 600 | 300 |
| 450 | 1200 | 600 | |
| 450 | 1500 | 750 | |
| 1800 | 525 | 600 | 300 |
| 525 | 900 | 600 | |
| 600 | 1200 | 600 | |
| 600 | 1500 | 750 | |
| 600 | 1800 | 750 | |
| 600 | 2400 | 750 | |
| Ecosol Soakwell Litter Trap Typical Product Dimensioning and Weights | |||
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 | ||||
|---|---|---|---|---|
| Soakwell Diameter (mm) | Suit pipe sizes up to | Soakwell depth below inlet pipe invert level | Designed Treatable flow rate1 | Maximum By-pass Capacity2 |
| mm | mm | mm | litres | litres |
| 600 | 150 | 600 | 9 | 22 |
| 150 | 900 | 9 | 22 | |
| 150 | 1200 | 9 | 22 | |
| 1070 | 225 | 600 | 18 | 63 |
| 225 | 1200 | 18 | 63 | |
| 1200 | 300 | 600 | 30 | 80 |
| 300 | 900 | 30 | 80 | |
| 375 | 1200 | 41 | 148 | |
| 375 | 1500 | 41 | 148 | |
| 1500 | 450 | 600 | 75 | 241 |
| 450 | 1200 | 75 | 241 | |
| 450 | 1500 | 75 | 241 | |
| 1800 | 525 | 600 | 82 | 364 |
| 525 | 900 | 82 | 364 | |
| 600 | 1200 | 138 | 520 | |
| 600 | 1500 | 138 | 520 | |
| 600 | 1800 | 138 | 520 | |
| 600 | 2400 | 138 | 520 | |
| Ecosol Soakwell Litter Trap Indicative Treatable Flow Rates & Maximium By-pass Capacities | ||||
- 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.
- 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.
Urban Asset Solutions 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 | ||
|---|---|---|
| Pollutants | Pollutant Capture Efficiency (%) | Description |
| Gross Litter | 98% | 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. |
| Ecosol Soakwell Litter Trap Capture Efficiency Performance Summary - 2018 | ||
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 Diameter | Indicative Inlet Pipe Diameter | Soakwell Litter Trap Depth | Indicative Maximum Gross Pollutants Holding Capacity | Optimal Catchment Area (Ha) | Recommended Cleaning Frequency |
| mm | mm | m3 | Ha | Per Annum | |
| 600mm | 150 | 300 | 0.339 | 1.20 | 1 |
| 900mm | 150 | 600 | 0.381 | 1.30 | 1 |
| 1070mm | 225 | 600 | 0.539 | 1.80 | 1 |
| 1200mm | 375 | 750 | 0.848 | 2.90 | 1 |
| 1500mm | 450 | 750 | 1.320 | 4.70 | 1 |
| 1800mm | 600 | 750 | 1.900 | 6.90 | 1 |
| Ecosol Soakwell Litter Trap Indicative Cleaning Frequencies - 2018 | |||||
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
