upper level ridgeupper managementupper plastic limitupper wind chartuprushupslope fogupstreamupward atmospheric radiationupward terrestrial radiationupward total radiationupwind slopeurban climateurban climatologyurban wasteusable volumeuseful storageusticv notch measuring weirv notch sharpe crest weirv shape sharp crested weirv shaped depressionvacummvacuolarvacuolatevacuolationvadoes zonevadosevadose watervalidationvalleyvalley fillvalley springvalley storagevalley trainvalley windvalu elementvalvevan allen radiation beltvan contractionvaporvaporimetervaporizationvapourvapour pressurevapour transportationvariabilityvariablevariancevaried flowvarnish = desert varnish
