frequency curvefresh breezefresh waterfreshetfriblefrictionfriction barrierfriction factorfriction headfriction lossfriction measuring weirfriction slopefrictional convergencefrictional divergencefrictional motionfrictional resistancefrictional velocityfrigidfringe waterfrontfront smokefrontal basinfrontal cyclonefrontal fogfrontal overflowfrontal precipitionfrontal surfacefrontogenesisfrontolysisfrostfrost beltfrost blisterfrost boilfrost climatefrost dayfrost heavefrost point temperaturefrostbitefrostburnfrostless zonefroud lawfroud numberfroude numberfroude similarity lawfrozen groundfugitive waterfuler methodfull dischargefull flowfull flow pipe