entraining agententrainmententranceentrance channelentrance galleryentrance headentrance lossentrance loss coefficiententrance rampentrance ramp terminalentrance transitionentrapped airentrechedentropyentry controlentry headenumerationenumeration districtenvelopeenvelope curveenvelope frameenveloping curveenveloping valueenvironmentenvironmental evaluationenvironmental factorenvironmental impactenvironmental impact studyenvironmental loadenvironmental studyenvironmental tracerenvironmental water headenzymeeolianephemeral lakeephemeral streamephemeris timeepicenterepilimnionepoxyepoxy cementepoxy concreteepoxy liningepoxy mortarepoxy resinequal angleequal legs angleequalization basinequationequation of characteristics