Vegetative Cover: Overtopping of Grassed Embankments
Vegetative Cover: Overtopping of Grassed Embankments
Vegetative Cover: Overtopping of Grassed Embankments
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Darrel TempleNational Dam Safety ProgramTechnical Seminar No. 20<strong>Overtopping</strong> <strong>of</strong> DamsFeb. 20‐21, 2013
<strong>Grassed</strong> WaterwaysVegetated Earth Spillways (SITES)<strong>Grassed</strong> <strong>Embankments</strong> (WinDAM)
SCS TP‐61
SCS TP‐61
Manning’s nC I2.5(h M1/3)n exp( CI[0.0133ln2( VR) 0.0954ln( VR) 0.297] 4.16)VR Product, ft 2 /s
e o ns( 1CF) n 2 e = Erosionally effective stress o = Gross hydraulic stress (dS)C F = Vegetal cover factorn s = Detachable particle roughness (Manning’s n)n = Total roughness (Manning’s n)(Temple et al., 1987)
Temple, 1980
GRASS LINED EARTH SPILLWAYS
dte .2 I 10w
<strong>Cover</strong> DiscontinuitiesMinorMajor
<strong>Cover</strong> Discontinuitiesn ( 1C) se o F n 2Minor discontinuities, Cf0Major discontinuities, Cf0 andn disc value
Embankment <strong>Overtopping</strong> Test
(Carter et al., 2010)
(Carter et al., 2010)
Grass may provide protectionMust be uniform over entire surface to be protectedMay not be adequate for protection in areas <strong>of</strong> concentrated attackProtective action is complex and current tools limited.Additional research needed to refine or replace current procedures
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