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Filtration within the Landfill Cell

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Introduction

The hydraulic conductivity of an aggregate drainage blanket is important in both the initial phase and the long term. Selection of an appropriate stone is important in the long term drainage performance of the system.

Environment agency R&D report P1-397 recommends the use of a course aggregate as a drainage medium in order to reduce the potential for biological clogging.

The recommended grading for aggregate in this application is BS 13242:2002 20/40, shown below.

British Standard Sieve

Size (mm)

Percentage Passing (%)
6398-100
4080-99
31.520-70 (+/-15)
200-20
14
100-5
4

Grading of drainage material 20-40mm

It is recognised that this approach is not always a viable option, lack of available stone within close proximity lack of a suitable protection geotextile etc., and on this basis a finer graded 10/20 drainage aggregate is permitted for use.

British Standard Sieve

Size (mm)

Percentage Passing (%)
63
40100
31.598-100
2080-99
1420-70 (+/-15)
100-20
40-5

Grading of drainage material 10-20mm

When a 10/20mm aggregate is used, there is a requirement to use a geotextile filter to reduce the potential for biological clogging within the drainage system.

HPS 3.3 has been developed by GEOfabrics to meet the specific requirements of this application, and when used in conjunction with a 10/20mm stone it can provide a designer with additional confidence that the risk of clogging within the drainage system has been dramatically reduced.

HPS 3.3/EA Requirement Comparison

PropertyTest MethodEA AcceptanceHPS 3.3
PolymerPolypropylenePolypropylene
Tensile StrengthISO 1031922kN/m
Tensile ElongationISO 1031980%
Static Puncture (CBR)ISO 122363300N3300N
Cone DropISO 91813mm
Opening SizeISO 1295650-120 µm60 µm
Water PermeabilityISO 11058>40 l/m2/s70 l/m2/s
ThicknessEN 964-1>1.5 mm3.3 mm
DurabilityAnnex B of EN 13252100 years100 years
Resistance to UVEN 12224> 1 month> 1 month

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