Rating Curve of a Grass-Lined, Open-Channel Spillway
Rating Curve of a Grass-Lined, Open-Channel Spillway
(OP)
Hi all,
I'm trying to get a feel for what methods engineers typically used to determine the stage-discharge rating curve of a grass-lined, open-channel spillway. Something you might see functioning as an emergency spillway at an earthfill dam or retention pond.
Please share what you normally use, not necessarily what can be used.
Thanks.
I'm trying to get a feel for what methods engineers typically used to determine the stage-discharge rating curve of a grass-lined, open-channel spillway. Something you might see functioning as an emergency spillway at an earthfill dam or retention pond.
Please share what you normally use, not necessarily what can be used.
Thanks.





RE: Rating Curve of a Grass-Lined, Open-Channel Spillway
RE: Rating Curve of a Grass-Lined, Open-Channel Spillway
n-value may be dependant on velocity - will the high velocity flow water rip out the grass? If so, what happens to your n-value?
Also depends on the approach conditions - will the flow be controlled by the spillway inlet control section? Is there a spillway training wall? How deep is the water upstream of the inlet control section?
Steepness - is the spillway channel steep, or will it flow subcritical? under all flow conditions?
RE: Rating Curve of a Grass-Lined, Open-Channel Spillway
RE: Rating Curve of a Grass-Lined, Open-Channel Spillway
Using Effective Length and an appropriate C.
RE: Rating Curve of a Grass-Lined, Open-Channel Spillway