Road Stormwater Drainage Inlets: Hydraulic Study
On-grade
Inlet Type:
Double Bay (1900mm), without Grate
Without deflectors
Capture Curves
Notes:
- Double Bay (1900mm)
- Without deflectors
- Upstream transition: 2000mm
- Downstream transition: 2000mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Curve Equations
Q = aXb+cX+d
Notes:
- Double Bay (1900mm)
- With no deflectors
- Upstream transition: 2000mm
- Downstream transition: 2000mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Pictures of test
Longitudinal grade (%) with Approach flow (l/s)
Grade 2% & flow 170l/s
Grade 6% & flow 120l/s
With deflectors
Capture Curves
Notes:
- Double Bay (1900mm)
- With deflectors
- Upstream transition: 2000mm
- Downstream transition: 2000mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Curve Equations
Q = aXb+cX+d
Notes:
- Double Bay (1900mm)
- With deflectors
- Upstream transition: 2000mm
- Downstream transition: 2000mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Pictures & drawings of test
Grade 1% & flow 70l/s
Grade 1% & flow 71l/s
Grade 8% & flow 70l/s
Single Pit (900mm), with Grate
Capture Curve
Notes:
- Single pit (900mm)
- With grate
- Without deflectors
- Without transition
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Capture Equation
Q = aXb+cX+d
Notes:
- Single pit (900mm)
- With grate
- Without deflectors
- Without transition
- Inlet depression: 50mm
- Kerb channel: 300mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Pictures & drawings of test
Grade 0.5% & flow 26l/s
Grade 0.5% & flow 73l/s
Grade 12% & flow 120l/s
Sag
Double Bay
Capture Curve
Notes:
- Single pit (900mm)
- Without deflectors and grate
- Upstream transition: 2000mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
