For inspection purposes only. Consent of copyright owner required ...

100 Year incl. 10%CC
81 m³
Filter Drain providing Storage of= 72 m 3
Rainfall Data as Recorded by Met Eireann in FSU - OPW
Allowable Discharge =
Total
PRELIMINARY - SURFACE WATER STORAGE CALCULATIONS FOR
Proposed Landfill Development Filter Drain for Access Road - Naul
Storm Return Period =
Maximum Storage Required =
2.64 l/s/ha 0.32 l/s
Proposed Impermeable Areas Gross Unit Impermeability Nett
Roads 0.150 ha @ 100% 0.150
Duration Rainfall Intensity Rainfall
Proposed
Imperm.
Area
Proposed
Run-off
Storage
Required
(min) (mm) (mm/hr) (m³/ha) (ha) (m³) (m³) (m³)
15 19.6 784.00 196 0.15 29 0.3564 29.0
30 24.1 482.00 241 0.15 36 0.7128 35.4
60 29.6 296.00 296 0.15 44 1.4256 43.0
120 36.4 182.00 364 0.15 55 2.8512 51.7
180 41.1 137.00 411 0.15 62 4.2768 57.4
240 44.8 112.00 448 0.15 67 5.7024 61.5
360 50.5 84.17 505 0.15 76 8.5536 67.2
540 57.1 63.44 571 0.15 86 12.8304 72.8
720 62.2 51.83 622 0.15 93 17.1072 76.2
1080 70.2 39.00 702 0.15 105 25.6608 79.6
1440 76.8 32.00 768 0.15 115 34.2144 81.0
2880 90.2 18.79 902 0.15 135 68.4288 66.9
4320 101.3 14.07 1013 0.15 152 102.6432 49.3
5760 111 11.56 1110 0.15 167 136.8576 29.6
8640 127.9 8.88 1279 0.15 192 205.2864 -13.4
11520 142.8 7.44 1428 0.15 214 273.7152 -59.5
14400 156.4 6.52 1564 0.15 235 342.144 -107.5
17280 169 5.87 1690 0.15 254 410.5728 -157.1
23040 192.3 5.01 1923 0.15 288 547.4304 -259.0
28800 213.6 4.45 2136 0.15 320 684.288 -363.9
36000 238.4 3.97 2384 0.15 358 855.36 -497.8
For inspection purposes only.
Consent of copyright owner required for any other use.
Storage Required =
Outflow
81 m³
0.150
EPA Export 24-08-2012:23:55:52