face plantingfacingfactorfactor of turbulencefactorial designfactors of rain erosionfaculative erosionfacultative organismfahrenheit scalefahrenheit temperature scalefall diameterfall velocityfalling head permeameterfalling massfalling tidefallowfallowingfanfanya juufarmfarm managementfarm pondfarm tenancyfarmabilityfarmlandfascine rock brushfascinemattressfast geological erosionfate modelingfathomfathometerfaultfault dam springfault springfault waterfaulted clayey materialfaunafeasibilityfeasibility studyfeedbackfeedforwardfellenius method of slicesfenfending groinfertilityfertilizationfertilizerfertilizer placementfetchfetch length effect