Compute spillway discharge Q by the weir-flow formula from weir type, head over crest, width and composite discharge coefficient, for quick flood-release checks.
Q:泄流量(m³/s)
m:流量系数(实用堰 0.42~0.50,宽顶堰 0.32~0.385)
L:堰顶净宽(m),H:堰上水头(m)
ε:侧收缩系数(0.9~1.0),σ:淹没系数(自由出流=1)
g = 9.81 m/s²,综合系数 C = σ·ε·m·√(2g)
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Spillway discharge | Q = m·b·√(2g)·H0^(3/2) with m ≈0.45–0.50 | SL 319-2018 spillway hydraulic design |
| WES crest profile | WES profile y = Hs/2 × (x/Hs)^1.85 fitted to design head | US Army WES crest curves |
| Discharge capacity | Flood routing over combined outlets sets the crest elevation | SL 104-2015 Water-Resources Computation Code |
| Energy dissipation | Hydraulic jump length ≈6.1 hc″; ski-jump erosion estimated by trajectory | SL 265-2016 energy-dissipation clauses |
溢洪道泄流能力计算器 - 实用堰与宽顶堰泄流量计算,基于堰流公式。。科学研究工具,采用标准科学公式,计算精准。