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Septic Tank and Pumped Effluent Drain Field

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Septic Tank and Pumped Effluent Drain Field – PowerPoint PPT presentation

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Title: Septic Tank and Pumped Effluent Drain Field


1
Septic Tank and Pumped Effluent Drain Field
  • Bruce Lesikar
  • Associate Professor
  • Agricultural Extension Service

2
Septic Tank and Pumped Drain Field
3
Pumped Effluent Drain Field
4
Pumped 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

5
Pumped Effluent Drain Field Materials / Trench
  • Trench Length maximum 70 feet
  • Width 6 minimum
  • Trench placed on the contour

6
Pumped 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

7
Pumped 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

8
Pumped 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.

9
Pumped Drain Field Separation Between Components
  • Minimum of 3 feet of undisturbed soil between
    trenches.

10
Pumped Drain Field Depth of Installation
  • Trench Depth
  • 18 Minimum Depth
  • 36 Maximum Depth

11
Pumped 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

12
Pumped Drain Field Pretreatment Required
  • Septic tank
  • Pump tank for storing the effluent

13
Pumped Drain Field Separation Distances
  • Restrictive Horizons 1 feet
  • Groundwater 2 feet

14
Pumped 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

15
Pumped 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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