Concrete Washout Calculator
Estimate washout pit size and water volume for cleaning concrete trucks, pumps, and tools on site.
๐ฟ Concrete Washout Calculator
Results
Total Washout450 gal
Pit Volume60.16 cu ft
Min Pit Size6 ร 6 ft
Liner Needed100 sq ft
๐ก How to Calculate Concrete Washout Requirements
Concrete washout is required on any construction site that receives ready-mix deliveries. Each truck washout generates approximately 100โ200 gallons of washwater (including chute rinse and drum washout). EPA regulations and most local stormwater permits require containment of all washout water.
A washout pit should be lined with 10-mil polyethylene sheeting and sized to contain all expected washout water. Minimum pit depth is 2 feet. After the water evaporates, the hardened concrete residue can be broken up and disposed of as solid waste.
3 truck loads with 150 gal washout each: 450 gallons total. At 2 ft depth, pit needs about 30 sq ft โ roughly a 6ร6 ft excavation. Liner: about 100 sq ft.