sales@althon.co.uk01603 488700www.althon.co.uk

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3www.althon.co.uk

High Capacity ChannelDrainage System

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High Capacity Channel Drainage System

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High Capacity Channel Drainage System

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High Capacity Channel Drainage System

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High Capacity Channel Drainage System

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573 NOHTLA052 NOHTLA051 NOHTLARainfall rate

Channelgradient

Flat/0%

1:500/0.20%

1:400/0.25%

1:300/0.33%

1:200/0.50%

1:100/0.10%

1:50/2%

1:20/5%

Flow rate l /s

25

28

30

33

40

60

86

140

25mm/hr

Area drained m2

3350

4032

4320

4752

5760

8640

12384

20160

50mm/hr

Area drained m2

1750

2016

2160

2376

2880

4320

6192

10080

75mm/hr

Area drained m2

1150

1344

1440

1584

1920

2880

4128

6720

100mm/hr

Area drained m2

850

1008

1080

1188

1440

2160

3096

5040

Flow rate l /s

40

60

71

75

95

140

190

300

25mm/hr

Area drained m2

5200

8640

10224

10800

13680

20160

27360

43200

50mm/hr

Area drained m2

2600

4320

5112

5400

6840

10080

13680

21600

75mm/hr

Area drained m2

1700

2880

3408

3600

4560

6720

9120

14400

100mm/hr

Area drained m2

1250

2160

2556

2700

3420

5040

6840

10800

Flow rate l /s

100

180

195

220

250

380

520

850

25mm/hr

Area drained m2

14000

25920

28080

31680

36000

54720

74880

122400

50mm/hr

Area drained m2

7500

12960

14040

15840

18000

27360

37440

61200

75mm/hr

Area drained m2

5000

8640

9360

10560

12000

18240

24960

40800

100mm/hr

Area drained m2

3400

6480

7020

7920

9000

13680

18720

30600

006 NOHTLA525 NOHTLARainfall rate

Channelgradient

Flat/0%

1:500/0.20%

1:400/0.25%

1:300/0.33%

1:200/0.50%

1:100/0.10%

1:50/2%

1:20/5%

Flow rate l /s

190

360

400

450

550

800

1200

1750

25mm/hr

Area drained Ha

2.40

5.18

5.76

6.48

7.92

11.52

17.28

25.20

50mm/hr

Area drained Ha

1.40

2.59

2.88

3.24

3.96

5.76

8.64

12.60

75mm/hr

Area drained Ha

0.90

1.73

1.92

2.16

2.64

3.84

5.76

8.40

100mm/hr

Area drained Ha

0.70

1.30

1.44

1.62

1.98

2.88

4.32

6.30

Flow rate l /s

290

460

570

610

750

1200

1600

2500

25mm/hr

Area drained Ha

3.50

6.62

8.21

8.78

10.80

17.28

23.04

36.00

50mm/hr

Area drained Ha

2.20

3.31

4.10

4.39

5.40

8.64

11.52

18.00

75mm/hr

Area drained Ha

1.40

2.21

2.74

2.93

3.60

5.76

7.68

12.00

100mm/hr

Area drained Ha

1.05

1.66

2.05

2.20

2.70

4.32

5.76

9.00

Storage capacity ofchannel to underside of

lid for attenuation

Channel size Capacity l /m

150 51

250 87

375 184

525 325

600 412

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