easement curveeasterlyeasterly windebbebb currentebb tideebbing and flowing springecentricityecho sounderecho soundingecofallowecofarmingecological catenaecological climatologyecologyeconomic feasibilityeconomic justificationeconomic lifeeconomic life of a projectecosphereecosystemecotypeectotrophic mycorrhizaedaphicedaphiligyeddyeddy currenteddy floweddy losseddy viscosityeddy windeffationeffective aquifereffective areaeffective atmosphereeffective elevation or usable elevationeffective gust velocityeffective height of anemometereffective lengtheffective porosityeffective precipitable watereffective precipitationeffective prosityeffective rainfalleffective sizeeffective snow melteffective snowmeiteffective stresseffective temperatureeffective terrestrial radiation