Ecosol Storm Pit – Class 1

The EcosolTM Storm Pit (Class 1) (at-source or in-line solution) is designed to provide pre-treatment of stormwater for the removal gross pollutants, sedimentation and hydrocarbons through physical filtration

Key Features


Ecosol Storm Pit View of Parts  Ecosol Storm Pit – Class 1 Ecosol Storm Pit Class 1 4 300x194Two distinctive systems are available as compact, treatment train systems.  The first, the a primary treatment system designed specifically to provide pre-treatment of stormwater run-off either at-source or in-line.  The system utilises the process of physical filtration along with gravitational separation to efficiently remove gross pollutants, sedimentation and hydrocarbons.

The second system, the EcosolTM Storm Pit (Class 2) is an all-in-one primary and secondary filtration system that helps overcome the need for multiple treatment measures on small catchments.

For information on the EcosolTM Storm Pit (Class 2) please refer to the Secondary Treatment Solutions section of our website.

Ecosol Storm Pit Internal Workings  Ecosol Storm Pit – Class 1 Ecosol Storm Pit Class 1 2 300x194THE ECOSOLTM STORM PIT (CLASS 1)

This compact at-source or in-line system is designed specifically to provide primary treatment of stormwater flows in one fully self-contained underground device. It consists of a primary treatment filtration basket for retention of sedimentation larger than 200 micron, a series of baffles and detention bay for retention of free floating hydrocarbons and gravitational separation of finer sedimentation.

It is designed to treat 100% of incoming flows up to its designed treatable flow rate, capturing and retaining pollutants conveyed from impervious areas in a rain event, either at point of source or in-line.

Ecosol Storm Pit Internal Section View  Ecosol Storm Pit – Class 1 Ecosol Storm Pit Class 1 3 300x194Compact and flexible and installed underground the EcosolTM Storm Pit (Class 1) system is designed for use in hardstand and trafficable car parks in typical, high to medium-density housing estates and small commercial developments up to one hectare in size. It suits pipe sizes from 100mm to 225mm in diameter.

The EcosolTM Storm Pit (Class 1) is easily cleaned using a small vacuum truck.

Ecosol-Storm-Pit-Class-1-Benefits  Ecosol Storm Pit – Class 1 Ecosol Storm Pit Class 1 Benefits


The EcosolTM Storm Pit (Class 1) Key Features and Benefits



Under Construction



Key Dimensions

The EcosolTM Storm Pit product range has been designed to help practitioners meet today’s stringent water quality objectives.  Whether installed at-source, in-line, or in-line the system is adaptable to most applications.

EcosolTM Storm Pit (Class 1) is designed specifically to target gross pollutants, coarse sediment, hydrocarbons and attached pollutants conveyed in stormwater run-off.  It is categorised as a primary treatment system.  The below table highlights the key dimensions for the EcosolTM Storm Pit (Class 1).


Ecosol-Storm-Pit-Class-1-Key-DimensionsEcosolTM Storm Pit (Class 1) Key Dimensions

Please Note: This system requires a minimum drop from the grated inlet or inlet pipe invert to the outlet pipe invert level of 430mm

      Ecosol Storm Pit View of Parts          Ecosol Storm Pit Internal Section View


Collection Efficiencies

In recent years modern Water Sensitive Urban Design (WSUD) objectives and principles now applied to most urban development’s require more onerous water quality objectives (WQO’s) specifically targeting the removal of suspended solids, nitrogen, phosphorus and heavy metals.

The EcosolTM Storm Pit (Class 1) provides engineers with a compact treatment measure that when implemented with other measures such as rain gardens or swales will achieve the necessary Water Quality Objectives.  EcosolTM Storm Pit (Class 1) is the ideal treatment solution for applications where space is limited. 


The EcosolTM Litter Basket is an integral part of the EcosolTM Storm Pit - (Class 1) providing essential pre-screening of stormwater run-off.  

1Figures quoted are mean pollutant removal efficiencies based on available product testing data.  It is important to note that these values are indicative only, given that the product is designed as a primary treatment system and as such the removal of chemical constituents is largely dependent of the composition of the particles retained within the system and the bonding of constituents to these retained particles.



EcosolTM Storm Pit - (Class 1) Pollutant Removal Efficiencies

Particle Size Distribution Collection Efficiency for the EcosolTM Storm Pit - Class 1

In order to determine a meaningful characterisation of the products collection efficiency, an extensive verification phase was undertaken by Avocet Consulting Pty Ltd, Ecosol Pty Ltd and EngTest (The University of Adelaide).  To best summarise the capture efficiency results of extensive product testing a regression of the data points using a sigmoidal regression curve was selected as it provided a conservative fit to the wide scatter of data collected.



EcosolTM Storm Pit (Class 1) - Particle Size Distribution results.


Sigmoidal regression curve graph for the EcosolTM Storm Pit (Class 1) Particle Size Distribution results.




Hydraulic Specification

Treatable Flow Rate
Treatable Flow Rate (TFR) is defined as the maximum flow rate through the EcosolTM Storm Pit before flows surcharge and commence by-passing the system untreated.  The TFR is constrained by the friction capacity and size of the outlet conduit and the percentage of unit fill.  For the purpose of assisting designers we have adopted conservative values and recommend designing the system with an outlet at 1% gradient to achieve optimal capture efficiencies and maximum treatable flow rates.  Further each system has been designed specifically to cater for peak flow by-pass conditions in the event that the system is full of contaminants and a significant storm event is occurring.  This fail safe by-pass eliminates the risk of potential localised flooding. 


This system is designed specifically as a primary treatment system to treat stormwater runoff for typical urban catchments of 100 – 750m2 based on a 100% impervious catchment area. The system provides essential pre-screening of stormwater flows.


EcosolTM Storm Pit - (Class 1) Hydraulic Specification



One of the key advantages of the EcosolTM Storm Pit (Class 1) is that a small vacuum truck can easily and efficiently remove all captures pollutants from both the primary litter basket and secondary treatment wet sump silo.  This eliminates any risks associated with manually handling captured pollutants.

As the primary litter basket in the EcosolTM Storm Pit (Class 1) is a dry storage basket there is a reduced likelihood of captured contaminants causing any significant adverse environmental impact or nuisance (such as odors and putrefaction).


Cleaning and Maintenance Ecosol Storm Pit View of Parts

As with all filtration systems, the EcosolTM Storm Pit should be cleaned regularly. The cleaning frequency, and the cost, depends heavily on the surrounding environment, the unit’s proximity to a waste facility and the quality and quantity of stormwater run-off conveyed to the system.

EcosolTM has a very competitive cleaning service. After each clean we provide a report detailing the volume and type of pollutants removed. We believe that it is in your best interests for EcosolTM staff to clean and maintain the unit, not only because we are specialists, but also because proper monitoring and maintenance enhances the unit life significantly.

Should you use another company to clean the unit, or undertake this work yourself, we request that it be conducted according to Ecosol’s specifications. Otherwise, you may invalidate your warranty, as damage caused by inappropriate cleaning procedures is not covered. The advantages of using EcosolTM to clean and maintain your unit are that you get:

• regular inspections of your unit;
• a comprehensive cleaning service with removal and disposal of all captured pollutants;
• a detailed report provided on completion of each clean;
• trained and experienced staff; and remedial work completed, if required. 

The table below give a broad guideline about the number of cleans required annually for each treatment element within the EcosolTM Storm Pit (Class 1) and EcosolTM Storm Pit (Class 2).



EcosolTM Storm Pit - (Class 1) Maintenance Frequencies



The EcosolTM Storm Pit (Class 1) can be installed either at-source or in-line on pipes ranging in diameter from 100mm up to 375mm, usually in small commercial and high-density catchments ranging in size from 0.010Ha to 0.075Ha. For larger pipe sizes contact your local Ecosol office.


The EcosolTM Storm Pit (Class 1) system is a compact at-source or in-line system that is designed specifically to provide primary treatment of stormwater flows in one compact device.

Typical applications include:

• small commercial developments;
• urban roads kerbside inlets; and
• high density residential developments.

Often this system is used in conjunction with tertiary treatment systems as part of a total treatment train WSUD.  For example vegetated swales are broad, shallow channels with a dense stand of vegetation covering the side slopes and bottom. They can be natural or man-made, and are designed to trap particulate pollutants, such as suspended solids and trace metals, enable infiltration, and reduce the flow velocity of stormwater runoff. 

By design all vegetated swales require primary treatment as they cannot cope with large volumes of gross pollutants. An EcosolTM Storm Pit (Class 1) located upstream of a swale provides essential primary treatment to remove both litter and vegetative pollutants thereby providing designers with cost-effective and efficient pre-screening. 



Ecosol Storm Pit Technical Specifications

EcosolTM Storm Pit -  Technical Specifications

Ecosol Storm Pit Installation Guide

EcosolTM Storm Pit -  Installation Guide

Ecosol Storm Pit Maintenance Guide

EcosolTM Storm Pit -  Maintenance Guide

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