Required grease interceptor capacity:
The size of the leach field are determined by two main factors.
The adsorption capacity of the soil can be determined by tests which are required in some jurisdictions. Typical absorption capacities for different types of soils are indicated below.
|Type of soil||Typical Absorption Capacity for a 24-hour period|
|Clay with small amount of sand or gravel||1 - 1.5||40 - 60|
|Clay with small amount of sand or gravel||1.5 - 2||60 - 80|
|Coarse sand or gravel||5||200|
The required area can be calculated by dividing the 24-hour amount of wastewater with the absorption capacity of the soil.
The total loading rate from a single family dwelling are 1200 gallons. The required leach field in a soil consisting of fine sand can be calculated as:
A = (1200 gallons) / (4 gallons/ft2)
= 300 ft2
The leach lines are made as trenches filled with washed rock/gravel to flow level with a perforated pipe on the top. Rock is added to cover the pipe and an approved filter material is used to keep soil from filtering down into the rock.
The leach line dimensions depends on the required capacity of the system. As a guideline
The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.
Cleanouts provides access to the sewer for rodding.
Volume of partly filled horizontal or sloped cylindrical tanks or pipes - online calculator.
Vents in draining systems protects traps against pressure differences that could cause them to siphon or blow out .
Drainage Fixture Units (DFU) connected to building drains and sewers.
Recommended drain trap sizes for different types of fixtures
Calculate expected volume flow load in sanitary drainage systems.
Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems.
Carrying capacities of sewer and wastewater pipes - gpm and liter per second.
In sewage piping and pumping systems the fluid flow rate must be kept within certain limits to avoid operating problems.
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