Formula for anti-seep collar
Formula for anti-seep collar
(OP)
Does anyone know the formula (or table) for calculating the size and number of anti-seep collars required to increase seepage length by 15% or better in a detention pond ? Also, are there anti-seep collars available for 8"ADS12 pipe ?





RE: Formula for anti-seep collar
For a non-critical application, use could use Lanes' weighted creep method. (E.W. Lane 1935)
the weighted creep distance is the sum of the vertical creep distances Lv, plus one third of the horizontal creep distances Lh. The weighted creep head ratio is given by the following formula:
Cw = (Lh+3Lv)/3Hdf
where Hdf is the effective hydraulic head
seepage is controlled by increasing the seepage length by using cutoff walls, collars such that Cw is increased to a conservative value. recommended values for various foundation materials are:
very fine sand/silt 8.5
fine sand 7.0
medium sand 6.0
coarse sand 5.0
fine gravel 4.0
medium gravel 3.5
coarse gravel, cobbles 3.0
boulders, cobbles, gravel 2.5
soft clay 3.0
medium clay 2.0
hard clay or hardpan 1.6
Chuck
cgopperton@stantec.com
http://www.stantec.com/
RE: Formula for anti-seep collar
RE: Formula for anti-seep collar
We usually use ten baffle plate pairs. There is plenty of info on the www.keyline.com.au web site. The particular page for baffle plates and the recommended placement is http://www.keyline.com.au/form02LP.html
Regards,
Ken Yeomans
yeomans@keyline.com.au
www.keyline.com.au
Agricultural consulting; property planning for sustainable agriculture; bio-organic soil regeneration and Landcare; contoured farm photomaps for remote planning; water conservation; flood irrigation of hillside & plains. Lay-pastor; publisher; computer &
RE: Formula for anti-seep collar
http://www.agridrain.com/pipeproduct.asp?prodtype=104