Submerged weir formula
Excerpt from: Rajaratnam, N., Muralidhar, D., 1969. Flow below deeply submerged rectangular weirs. Journal of Hydraulic Research 7, 355–374.
In submerged flow, the flow rate depends on the upstream water level
With:
- L the weir width in m
- hamont the upstream head on the weir in m
- haval the downstream head on the weir in m
- Cd the discharge coefficient (equal to 0.9 by default).
This formula is not recommended for flooding below 80%.
Rajaratnam, N., Muralidhar, D., 1969. Flow below deeply submerged rectangular weirs. Journal of Hydraulic Research 7, 355–374.