Road Stormwater Drainage Inlets: Hydraulic Study
On-grade
Inlet Type
Double Bay (1900mm)
Without deflectors
Capture Curves
Notes:
- Double Bay (1900mm)
- Without deflectors
- Upstream transition: 1200mm
- Downstream transition: 600mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Extended apron-300mm
- Crossfall: 3%
Curve Equations
Q = aXb+cX+d
Notes:
- Double Bay (1900mm)
- Without deflectors
- Upstream transition: 1200mm
- Downstream transition: 600mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Extended apron-300mm
- Crossfall: 3%
Pictures & drawings of test
Longitudinal grade (%) with Approach flow (l/s)
Grade 0.5% & flow 69l/s
Grade 1% & flow 70l/s
Grade 2% & flow 68l/s
Inlet drawing details
With deflectors
Capture Curves
Notes:
- Double Bay (1900mm)
- With deflectors
- Upstream transition: 1200mm
- Downstream transition: 600mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Extended apron-300mm
- Crossfall: 3%
Curve Equations
Q = aXb+cX+d
Notes:
- Double Bay (1900mm)
- With deflectors
- Upstream transition: 1200mm
- Downstream transition: 600mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Extended apron-300mm
- Crossfall: 3%
Pictures & drawings of test
Grade 4% & flow 70l/s
Grade 8% & flow 120l/s
Grade 16% & flow 36l/s
Inlet drawing details
Sag
Double Bay
Capture Curve
Notes:
- Double Bay (1900mm)
- Without deflectors
- Upstream transition: 1200mm
- Downstream transition: 600mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Extended apron-300mm
