Flow depth at the spillway toe
Flow depth at the spillway toe
(OP)
This is probably an easy one but...
What is a suitable method for determining the flow depth at the toe of a dam spillway.
Should it be based on Manning formula or an energy method or else.
What is a suitable method for determining the flow depth at the toe of a dam spillway.
Should it be based on Manning formula or an energy method or else.





RE: Flow depth at the spillway toe
RE: Flow depth at the spillway toe
RE: Flow depth at the spillway toe
I have this...:
V1 = (2g(Z+Ha-y)^0.5
Where
V1 = Theorical velocity at the toe of the spillway
Z = is the fall or vertical distance in ft from the upstream reservoir level to the floor at the toe
Ha = Upstream velocity head
y1 = Depth of flow at the toe
The actual velocity is always less than the theorical velocity due to energy loss involved.
RE: Flow depth at the spillway toe
V=Q/(yB) F=V/(gy)0.5 y2/y1 = 0.5 [(1+8F12 )0.5 - 1]
L = 220 y1 tanh[(F1-1)/22] h = (y2-y1)3 /(4y1y2)
where:
B=Channel width (m), F=Froude number (dimension-less), g=acceleration due to gravity (9.8066 m/s2), h=Head loss (m), L=Length of jump (m), Q=Discharge (m3/s), tanh=Hyperbolic tangent trigonometric function, V=Velocity (m/s), y=Water depth (m)