INSTALLATION GUIDE
SYSTEM DRAINAGE AREAS: GRADIENT AGAINST RAINFALL INTENSITY BY NOMINAL BORE
Gradient
Rainfall intensity (discharge l/s)
Area drained 30mm/hr
Area drained 40mm/hr
Area drained 50mm/hr
Area drained 75mm/hr
Nominal bore (mm)
125
125
125
125
125
1:50 (2.00%)
15.1
1860
1400
1120
740
1:100 (1.00%)
10.9
1310
980
790
520
1:200 (0.50%)
7.7
920
690
550
370
1:300 (0.33%)
6.2
750
560
450
300
1:400 (0.25%)
5.4
650
480
390
260
1:500 (0.20%)
4.8
580
430
350
230
1:1000 (0.10%)
3.3
400
300
240
100
Class A 15kN
Class B 125kN
Class C 250kN
Class D 400kN
Class E 600kN
Class F 900kN
Unit weight (kg)
Unit/bore (mm)
Main units DBA/125
•
•
102
DBM/125
•
•
•
•
•
•
106
DBG/DI/125
•
•
•
•
107
DBK HB2/125
•
•
•
•
129
Accessories Type A silt box top
•
•
•
115
Type H silt box top
•
•
•
•
•
•
148
Inspection unit DBG/DI/125
•
•
•
•
107
Inspection unit kerb HB2/125
•
•
•
•
129
Manhole cover kerb HB2/125
•
•
•
•
175
Transition kerb HB2/125
•
•
•
•
109
• indicates suitability Key to unit abbreviations: HB half batter, DI ductile iron BS EN 1433 standard classifications Class A (15kN): Pedestrian areas, walkways and cycle tracks. Class B (125kN): Pedestrianised areas and car parks with limited vehicle access. Class C (250kN): Kerbside drainage to public highways, parking areas, service stations and pedestrian areas.
Class D (400kN): Public highways and general parking areas. (Note: Grid systems should not be used for fast moving traffic.) Class E (600kN): Heavy industrial sites, dockyards and lorry parks. Class F (900kN): Airport taxiways and specialist industrial sites.
145
TECHNICAL INFORMATION: charcon.technical@aggregate.com
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