Crop coefficients were found to be higher than those of
traditional crops grown in the Mediterranean area for all growth stages.Water use efficiency (WUE) was
rather low on average,at0.94g/L for giant reed-unit and 0.66g/L for umbrella sedge-unit.Results showed
that greater or lesser amount of water atthe out flow of the CWs is always dependent upon the ET rate of
the species anditis essentialto estimate the ET when designing a CWs in those regions where prolonged
periods of drought can substantially reduce the amount of treated wastewater available for reuse in
agriculture.