Vegetative Cover: Overtopping of Grassed Embankments

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Vegetative Cover: Overtopping of Grassed Embankments

Darrel TempleNational Dam Safety ProgramTechnical Seminar No. 20Overtopping of DamsFeb. 20‐21, 2013


Grassed WaterwaysVegetated Earth Spillways (SITES)Grassed Embankments (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


Cover DiscontinuitiesMinorMajor


Cover Discontinuitiesn ( 1C) se o F n 2Minor discontinuities, Cf0Major discontinuities, Cf0 andn disc value


Embankment Overtopping 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 of concentrated attackProtective action is complex and current tools limited.Additional research needed to refine or replace current procedures

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