attenuation tank design 100 yrs + 30%
TRANSCRIPT
1.20 1.38 1.45
1.22 1.41 1.49
1.23 1.42 1.50
1.24 1.44 1.53
1.24 1.45 1.54
1.24 1.44 1.54
1.23 1.43 1.52
1.22 1.42 1.51
1.21 1.40 1.49
1.18 1.37 1.45
* Z2 is a growth factor from M5 rainfalls
1.45 1.60 1.84
1.49 1.65 1.91
1.50 1.67 1.94
1.53 1.70 1.99
1.54 1.72 2.02
1.54 1.72 2.02
1.52 1.71 1.99
1.51 1.70 1.97
1.49 1.68 1.94
1.45 1.62 1.87
* Z2 is a growth factor from M5 rainfalls
Spreadsheet provided by: www.YourSpreadsheets.co.uk calculations are based on CIRIA C697 2007: The SUDS Manual
YourSpreadsheets™ 2nd Floor, 52 Marcus Hill, London www.YourSpreadsheets.co.uk Tel: 020 7542 8734
Ordsall Primary BN16Revision
Job No: P.Y.BE.29224 Page: C/01
Section: Attenuation tank Prepared By: RS Date: 26/10/2016
GENERAL DATA SUMMARY OF CALCULATIONS
site location: England and Walesrequired storage volume for discharge rate 'v1' = 10.65 m3
60 min rainfall depth of 5 year return period 'R' [mm] = 19
M5-60 to M5-2d rainfall ratio 'r' = 0.40required storage volume for discharge rate 'v2' = 19.46 m3
proposed discharge rate 'v1' [litre/s] = 7.00
proposed discharge rate 'v2' [litre/s] = 5.00
allowance for climate change: 30%
AREA DATAimpermeability
[%]effective area
[m 2 ]
impermeable area 'A1' [m2 ] = 720 100.00 720
landscaping and/or green roof area 'A2' [m2 ] = 0 80.00 0
other partially permeable area 'A3' [m2 ] = 0 20.00 0
AREA DRAINED TO ATTENUATION TANK = 720 m2
REQUIRED STORAGE VOLUME PER RAINFALL DURATION FOR DISCHARGE RATE v 1
rainfall duration
[min]
rainfall factor Z1
M5-D rainfalls
[mm]
M10-D M20-D M30-D outflow from attenuation tank [m 3 ]
required storage
[m 3 ]Z2rainfalls
[mm]inflow [m 3 ]
Z2rainfalls
[mm]inflow [m 3 ]
Z2rainfalls
[mm]inflow [m 3 ]
5 0.37 7.09 11.09 7.98 12.73 9.17 9.65 2.10 7.55
10 0.52 9.94 15.77 11.35 18.22
15 0.63 12.03 19.21 13.83
13.40
10.65
13.12 19.25 13.86 4.20 9.66
28.58
22.25 16.02 23.54 16.95 6.30
60 1.00 19.00 30.63 22.05
30 0.80 15.26 24.60 17.72
2.19
20.58 30.31 21.82 12.60 9.22
43.04
35.77 25.75 38.04 27.39 25.20
240 1.45 27.49 43.95 31.65
120 1.21 22.93 36.96 26.61
0.00
30.99 45.82 32.99 50.40 0.00
56.16
51.10 36.79 54.43 39.19 100.80
600 1.79 34.07 53.50 38.52
360 1.60 30.46 48.26 34.75
47.66 252.00 0.00
40.44 59.85 43.09 151.20 0.00
75.79
62.18 44.77 66.19
54.57 80.49 57.95 604.80 0.00
REQUIRED STORAGE VOLUME PER RAINFALL DURATION FOR DISCHARGE RATE v 2
1440 2.24 42.56 65.56 47.20
rainfalls [mm]
rainfall duration
[min]
rainfall factor Z1
M5-D rainfalls
[mm]
M30-D M50-D M100-D
inflow [m 3 ]
14.73
outflow from attenuation tank [m 3 ]
required storage
[m 3 ]Z2rainfalls
[mm]inflow [m 3 ]
Z2rainfalls
[mm]inflow [m 3 ]
Z2
10 0.52 9.94 19.25 13.86
5 0.37 7.09 13.40 9.65
14.76
10.61 16.97 12.22 1.50 10.72
26.13
21.32 15.35 24.67 17.76 3.00
30 0.80 15.26 30.31 21.82
15 0.63 12.03 23.54 16.95
19.46
18.81 30.39 21.88 4.50 17.38
42.58
33.76 24.31 39.53 28.46 9.00
120 1.21 22.93 45.82 32.99
60 1.00 19.00 38.04 27.39
7.31
30.66 49.94 35.96 18.00 17.96
61.10
51.39 37.00 60.15 43.31 36.00
360 1.60 30.46 59.85 43.09
240 1.45 27.49 54.43 39.19
0.00
44.00 71.11 51.20 72.00 0.00
74.22
67.21 48.39 77.87 56.07 108.00
1440 2.24 42.56 80.49 57.95
600 1.79 34.07 66.19 47.66
0.00
53.44 85.82 61.79 180.00 0.00
89.89 64.72 103.44 74.47 432.00