field blankfield boundary gullyfield capacityfield capacity zonefield capaciyfield datafield experiencesfield ground water velocityfield moisture deficiencyfield testfield wastefilamentfilamental velocityfilamentaryfillfill infilling processfilterfilter bedfilter cropfilter efficiencyfilter packfilter stripfiltering mediumfiltratefiltrationfiltration springfinal stagefine noncohesive soilfine rackfine sandfine screenfine texturefinesfing grainedfinite difference time stepingfinite differencesfinite elementsfinite increments methodfiordfirebreakfirmfirnfirst fillingfirst order climatological stationfirst significant precipitationfirthfissurefissure springfissure water