Nadvišanje pregrade (krone pregrade nad normalno zajezitvijo)
Nadvišanje pregrade - Vertikalna razdalja med določeno vodno gladino in vrhom pregrade. Tako je čisto nadvišanje ali suho nadvišanje ali visokovodno nadvišanje vertikalna razdalja med gladino najvišje zajezbe in vrhom pregrade (slika 1).
Celotno nadvišanje pregrade je vertikalna razdalja med gladino normalne zajezbe in vrhom pregrade.
Tisti del nadvišanja pregrade, ki ga je pripisati visokovodni akumulaciji, se včasih imenuje mokro nadvišanje, vendar ta izraz ni priporočljiv, ker je bolje, da je nadvišanje podano v odnosu na vrh pregrade.
Freeboard
Freeboard - The vertical distance between a stated water level and the top of a dam. Thus Net freeboard or Dry freeboard or Flood freeboard is the vertical distance between the maximum water level and the top of the dam (Fig. 1)
Gross freeboard or Total freeboard is the vertical distance between the retention water level and the top of the dam.
That part of the Gross freeboard attributable to the depth of flood surcharge is sometimes referred to as the Wet freeboard, but this term is not recommended as it is preferable that freeboard be stated with reference to the top of dam.
