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    • Insurance; see if your drainage problems can be claimed for through your insurance
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    • Contact Just Surveys Ltd.
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    • High Power Water Jetting, site maintenance and gully sucking
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    • Vacuum Excavation for safe excavations in sensitive no dig areas.
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    • House Purchase Survey ensures that there are no nasty surprises after you have purchased your property.
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    • Domestic Jetting used for planned, regular maintenance to avoid blockages and flooding >
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      • Waste Disposal, Septic Tanks in Gloucester £160
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Percolation Testing

Just Surveys Drainage Specialists
01452 730185
OUT OF HOURS ~
07712526297
A Percolation test (also called a porosity test) should be carried out prior to the installation of a septic tank and / or drainage field.
​

​The purpose of the test is to establish the suitability of the ground for the installation of the drainage field.
Sometimes the ground can be unsuitable if there is a high water table or the soil is mainly clay.

If the soil is suitable, the test will prove the rate at which the water will disperse.
Depending on what the calculation determines we will be able to design a drainage field accordingly.
​
All tests should be carried out during normal weather conditions and if undertaken in summer an allowance should be made for winter weather.
​
The test is carried out over two days, the first day is to saturate the ground and the second to record the seepage.
​
​DAY 1
  • Excavate three holes approx 1m x 1m and 1m deep. This allows for the smaller excavation of 300mm square and 300mm below the proposed outlet from the septic tank in which to measure the perosity.
  • Dig the test hole to the correct depth. Remove all loose debris.
  • Fill the test hole with water and allow to seep away overnight.
​DAY 2
  • Refill the test section with water. Observe the time, in seconds, for the water to seep away from 75% full to 25% full.
  • Divide this time by 150mm.
  • The answer gives average time in seconds (Vp) required for the water to drop 1mm.
  • Carry out the test at least 3 times to take the average on each excavation.
​
If the average value of Vp falls below 15 or over 100 the ground will not be suitable for a drainage field.

The installation of a packaged treatment plant may be a better option in this situation.


The drainage field must be a minimum of 10m from a watercourse, 15m from a building and 50m from a borehole or spring.
Also they should not be constructed under driveways, parking areas or buildings.
Tress in the vicinity will potentially cause a problem.


For full building regulations please click below.


CLICK HERE

Gloucester


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Just Surveys Ltd. Dexter 1, Linton Farm. Highnam, Gloucester. GL2 8DF
​Company Registered in England. Company Number: 05745451
​Copyright ©  2006-2023 Just Surveys Ltd
  • Home
    • Quick Purchase >
      • TO PAY AN INVOICE >
        • Invoice-£1200 + VAT
        • Invoice-£900 + VAT
        • Invoice-£800 + VAT
        • Invoice-£750 + VAT
        • Invoice-£600 + VAT
        • Invoice-£500 + VAT
        • Invoice-£400 + VAT
        • Invoice-£300 + VAT
        • Invoice-£240 + VAT
        • Invoice-£160 NO VAT
        • Invoice-£150 + VAT
        • Invoice-£120 + VAT
      • Drainage Services >
        • CCTV Drain Camera Survey with High Pressure Water Jetting for Handover
        • CCTV Drain Camera Survey-Full Day
        • CCTV Drain Camera Survey-Half Day
        • High Pressure Water Jetting-Full Day
        • High Pressure water Jetting-Half Day
      • Pre Build Over Survey
      • Post Build Over Survey
      • House Purchase Survey
      • Septic Tank Empty
      • Domestic Unblock
    • Just Surveys Ltd, a Gloucester based drainage company
    • Drainage Services Provided
    • Drainage Report Breakdown
    • Prices and Invoicing for our drainage customers
    • Insurance; see if your drainage problems can be claimed for through your insurance
    • Vacancies
    • Contact Just Surveys Ltd.
  • Commercial Drains
    • Drain Surveys
    • Environmental Drainage Issues
    • High Power Water Jetting, site maintenance and gully sucking
    • Commercial Unblocks
    • Waste Disposal from commercial properties including pump treatment plants, grease traps and gullies.
    • Vacuum Excavation for safe excavations in sensitive no dig areas.
    • Utility Mapping >
      • GPR >
        • PAS128
  • Domestic Drains
    • Build Over Surveys for house extensions over or near to drain runs.
    • House Purchase Survey ensures that there are no nasty surprises after you have purchased your property.
    • Problem Solving for both foul and storm drainage systems.
    • Environmental Drain Survey
    • Domestic Jetting used for planned, regular maintenance to avoid blockages and flooding >
      • Domestic Unblocks in Gloucester £120 plus vat.
      • Waste Disposal, Septic Tanks in Gloucester £160
  • Deltamec Pumps, pump servicing and replacement.
  • Drainage Repairs including patch liners.
  • Drainage Fields & Soakaways
    • Percolation Testing also called porosity test.
  • Health & Safety
  • Advice and Frequently Asked Questions
  • Accreditations
  • Clients
  • Area Covered, Gloucestershire, Herefordshire, Worcestershire, South Wales, Wiltshire, Avon, Somerset.
  • Policies
    • GDPR >
      • Cookiie Declaration
    • Blog
  • Category