HomeMy WebLinkAbout2660021 - F.I. Received Doc. - Soakway DesignSoakaway Design to BRE 365 sept 1991 Project: PONA Drumbear
Project No:P2588 Date: 25.06.2026
Compiled By Ciarán Kennedy, Barrett Mahony Consulting Engineers, October 2002 Area:Soakaway No. 1
Site particulars Selected Soakaway Details Effective Depth 1.75 m
Drained area (A)950 m2 (Measured Off Plan Drawing)Length 29.6 m
Site Location Monaghan Breadth 0.8 m
Void Ratio (due to Stone Infill etc)0.95
Available Storage Volume 39.368 m3
Percolation Test Details (full sized test)
Pit depth below outfall D m Storm 1in 10 Year Rainfall + 20% Inflow Outflow Storage Req
Plan Dimensions W m Duration =A.R a x f x D I - O
L m D =R m3 m3 m3
Test Results (Percolation Times ( mins )) 1
2
D %Test 1 Test 2 Test 3 5 8.60 10.32 9.80 0.10 9.70
T Full 100 10 10.90 13.08 12.43 0.20 12.22
T 75 75 15 12.60 15.12 14.36 0.30 14.06
T 50 50 30 15.90 19.08 18.13 0.61 17.52
T 25 25 60 20.20 24.24 23.03 1.22 21.81
Empty 0 est 120 25.60 30.72 29.18 2.44 26.75
240 32.40 38.88 36.94 4.87 32.06
tp75-25 0 0 0 360 37.20 44.64 42.41 7.31 35.10
Tp75-25 0 min (max result)720 47.20 56.64 53.81 14.62 39.19
1440 59.80 71.76 68.17 29.24 38.93
2880 70.3 84.36 80.142 58.49 21.66
Max Storage Required (m3)39.19
Storage Volume Greater Than Required Therefore Satisfactory
Check Time for Soakaway to Half empty =57890 Seconds
16.08 Hours
Half Empty Time less than 24Hours Therefore Satisfactory
as-50 0 m2
Vp75-50 0 m3
f=Infiltration Rate 6.36E-06 m/s
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5% FullTime (Mins)
Percolation rates
surface area of 50% of
effective depth excluding
base
Volume percolated
between 75% and 25%
Readings
Remarks:
Selected Size 1.5 x 1.5 x 35m Long is deemed adequate.
Half empty time less than 24 hours,
Therfore Adequate, select as final design.RECEIVED: 25/08/2026