effective elevation or usable elevationeffective gust velocityeffective height of anemometereffective lengtheffective porosityeffective precipitable watereffective precipitationeffective prosityeffective rainfalleffective sizeeffective snow melteffective snowmeiteffective stresseffective temperatureeffective terrestrial radiationeffective veloctivyefficiencyefficiency of water jumpefficiency trapeffictive ground water velocityeffluenteffluent rivereffluent s treameffluent weireheigenvalueeivergence theoremel ninoelapsed timeelastic membraneelbowmeterelectric resistivityelectrical resistance blockselectrical sensorelectrical thermometerelectricity of precipitationelectrolysiselectrosoundelectrostatic chargeelementelevated tankelevationelevation angleelevation energyelevation headellipticelliptic projectionellison splash cupselnino southern oscillationelongation ratio
