Crop coefficients were found to be higher than those of
traditional crops grown inthe Mediterranean area for all growth stages.Wateruse efficiency (WUE) was
rather lowonaverage,at0.94g/L forgiant reed-unitand0.66g/L forumbrellasedge-unit.Results showed
that greater or lesser amount of water atthe outflowofthe CWs is always dependent upon the ET rate of
the species anditis essentialto estimate the ET whendesigning aCWs inthose regionswhereprolonged
periods of drought can substantially reduce the amount of treated wastewater available for reuse in
agriculture.