<Dl> <Dd> * Period 1 March to 31 July . 1 feddan is 0.42 ha or about 1 acre . </Dd> <Dd> * Data from the Egyptian Water Use Management Project (EWUP) </Dd> </Dl> <Dd> * Period 1 March to 31 July . 1 feddan is 0.42 ha or about 1 acre . </Dd> <Dd> * Data from the Egyptian Water Use Management Project (EWUP) </Dd> <P> The salt concentration of the water in the Aswan reservoir is about 0.25 kilograms per cubic metre (0.42 lb / cu yd), a very low salinity level . At an annual inflow of 55 cubic kilometres (45,000,000 acre ⋅ ft), the annual salt influx reaches 14 million tons . The average salt concentration of the drainage water evacuated into the sea and the coastal lakes is 2.7 kilograms per cubic metre (4.6 lb / cu yd). At an annual discharge of 10 cubic kilometres (2.4 cu mi) (not counting the 2 kilograms per cubic metre (3.4 lb / cu yd) of salt intrusion from the sea and the lakes, see figure "Water balances"), the annual salt export reaches 27 million ton . In 1995, the output of salt was higher than the influx, and Egypt's agricultural lands were desalinizing . Part of this could be due to the large number of subsurface drainage projects executed in the last decades to control the water table and soil salinity . </P>

Which flower has been the national flower of egypt for the last 4000 years