Dry Debris Buildup

Dry debris buildup is identified using device level readings over time to measure the depth of accumulated debris in the pit.

This helps councils and maintenance teams:

• Prioritize cleaning for heavily impacted pits.

• Optimize resources and reduce costs.

• Prevent flooding by keeping pits functional.

• The graph on the next page shows how debris levels are calculated to support effective stormwater management.

Calculation of Dry Debris

The graph above shows the minimum percentage reading from the bottom of the pit over a week, which is used to calculate the  dry debris buildup percentage. 

For this pit, the debris buildup is calculated to be 31%, as this represents the lowest reading recorded during the week. A new debris buildup percentage is recalculated at the start of each week, based on the updated minimum readings. This method helps track debris accumulation over time and supports maintenance planning.

Floating Debris Buildup

To identify floating debris buildup, Matter uses a defined debris threshold to measure the base water level in the pit, litter trap, or gross pollutant trap (GPT).

This measurement helps calculate the level of floating debris, allowing councils to monitor and maintain stormwater systems, optimise litter trap performance, and ensure GPTs remain effective. The graph on the next page illustrates this process.

Graph of Floating Debris

The graph above illustrates how floating debris buildup is calculated using Matter’s Capture Platform. Similar to the dry debris calculation, the minimum reading from the base of the pit is used. However, the debris threshold (water level) is subtracted from this reading to determine the level of floating debris (e.g., 33% - 24% = 9% debris buildup).

This approach accounts for factors like tides and rainfall, which can alter water levels and affect the debris threshold, ensuring accurate measurements of floating debris. As with the dry debris a new debris buildup percentage is recalculated at the start of each week.