Road Stormwater Drainage Inlets: Hydraulic Study
Inlet Type: Double Bay (1900mm) With "Abrupt" Transition
On-grade
With & without deflectors
75 mm Lid without support
Capture Curves
- "Abrupt" transition
- 75mm lid without support
Notes
- Double Bay (1900mm)
- 75mm lid
- Without support to lid
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Curve Equations
- "Abrupt" transition
- without central support
Q = aXb+cX+d
Notes
- Double Bay (1900mm)
- 75mm lid
- Without support to lid
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Pictures of test
Standard
1900mm inlet opening - (75mm lid "abrupt" transition without support)
Longitudinal grade (%) with Approach flow (l/s)
Grade 0.5% & flow 70.5l/s
Grade 2% & flow 122l/s
Grade 8% & flow 320l/s
50 mm Lid with central front support
Capture Curves
- “Abrupt” transition
- 50mm lid with central front support
Notes:
- Double Bay (1900mm)
- 50mm lid with central front support
- Inlet with deflectors, if grade>=1%
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Curve Equations
-"Abrupt" transition
-Central front support
Q = aXb+cX+d
Notes:
- Double Bay (1900mm)
- 50mm lid with central front support
- Inlet with deflectors, if grade>=1%
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Pictures of test
Grade 0.25% & flow 241l/s
Grade 1% & flow 169l/s
Grade 6% & flow 121l/s
Grade 10% & flow 121l/s
Grade 16% & flow 70l/s
Single Bay (900mm)
With deflectors
Capture Curves
Notes
- Single Bay (900mm)
- With deflectors
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Kerb and channel: barrier- 300mm
- Kerb: channel-300mm,
- Crossfall: 3%
Curve Equations
Q = aXb+cX+d
Notes
- Single Bay (900mm)
- With deflectors
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Without deflectors
Capture Curves
Notes
- Single Bay (900mm)
- Without deflectors
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Kerb and channel: barrier- 300mm
- Kerb: channel-300mm,
- Crossfall: 3%
Curve Equations
Q = aXb+cX+d
Notes
- Single Bay (900mm)
- With deflectors
- Upstream transition: 1500mm
- Downstream transition: 500mm
- Inlet depression: 50mm
- Barrier Kerb and channel: 300mm
- Crossfall: 3%
Sag
Double Bay Sag Test with 50mm lid & 75 mm lid
Capture Curves
Notes
- Double Bay (1900mm)
- 75mm lid with no support vertical transition
- 50mm lid with back watertable support vertical transition
- Upstream transition: 1500mm
- Inlet depression: 50mm
- Kerb and channel: barrier- 300mm
- Kerb: channel-300mm
- Crossfall: 3%
Pictures of test
