effective 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 ratioeluvial horizoneluviationeluviumemagramemanometryembankmentembaymentembergerembouchureembrothermic diagramemergency spillwayemergency spilwayempiricistemulsoidencoding