Title: Septic Tank and Pumped Effluent Drain Field
1Septic Tank and Pumped Effluent Drain Field
- Bruce Lesikar
- Associate Professor
- Agricultural Extension Service
2Septic Tank and Pumped Drain Field
3Pumped Effluent Drain Field
4Pumped Effluent Drain Field
- Can be used on single family residences
- Not for use on commercial or institutional
structures - Not for use on sites with greater than 2 slope
5Pumped Effluent Drain Field Materials / Trench
- Trench Length maximum 70 feet
- Width 6 minimum
- Trench placed on the contour
6Pumped Drain Field Materials for Trench
- Pea Gravel is the minimum size and can go to 2
measured along the greatest dimension - Chipped Tires
- Other Materials, Does Not Dissolve
- Chamber systems
7Pumped Drain Field Materials / Distribution
- Manifold or header pipe diameter of 1.25 to 1.5
- Lateral pipes have a diameter of 1.25 to 1.5
- 3/16 ¼ inch diameter holes for wastewater to
exit pipe are facing down - 5 foot spacing on the holes.
- 6 of media below the pipe and 9 minimum of
media
8Pumped Drain Field Materials / Pump
- Pump tank sized to have dosing volume plus 1/3 of
daily flow above the alarm on float activation. - Minimum pump size is ½ horsepower.
9Pumped Drain Field Separation Between Components
- Minimum of 3 feet of undisturbed soil between
trenches.
10Pumped Drain Field Depth of Installation
- Trench Depth
- 18 Minimum Depth
- 36 Maximum Depth
11Pumped Drain Field Treatment Method
- Small diameter pipe distributes wastewater to
trench - Pores in media store wastewater until percolation
into the soil - Geotextile fabric keeps soil out of media
- Soil provides treatment of the wastewater
12Pumped Drain Field Pretreatment Required
- Septic tank
- Pump tank for storing the effluent
13Pumped Drain Field Separation Distances
- Restrictive Horizons 1 feet
- Groundwater 2 feet
14Pumped Drain Field System Sizing / Area
Required
- Based on number of bedrooms
- Two bedroom home requires 1000 linear feet of
trench - 400 additional linear feet for each additional
bedroom
15Pumped Drain Field System Sizing
Requirements/ Determine the Number and Length of
Trenches
- Evaluate lot dimensions
- Evaluate required setback distances
- Evaluate the slope of the lot
- Select trench lengths which fit the site
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