158 EQ.TPTiJLJT A<*/!/cr//rURE. 



the year 1901 was 29*6 cubic metres per i'eddan per 24 

 hours. In Lower Egypt, for the whole area, including 

 cultivable land uncropped, the calculation was 9 cubic 

 metres per feddan for the year 1900. But that was an 

 extremely bad low Nile, and no rice was grown. In 1901 

 'when rice was grown the calculation rose to 11*67 cubic 

 metres. For the area cultivated with summer crop, ex- 

 clusive of rice, it may be accepted that 25 cubic metres 

 per feddan per 24 hours is sufficient. For rice, it is assumed 

 that 40 cubic metres per feddan per 24 hours is needed, 

 but this is admittedly an underestimate. During the first 

 week or 10 days of its growth rice is flooded to a depth 

 of 5 centimetres, generally more. The water is run off 

 each evening, and the field filled up next morning. The 

 daily supply during the first 10 days is therefore 200-300 

 cubic metres. Afterwards, when the rice plant is stronger 

 a current is kept running through the field and the quan- 

 tity used is unknown. 



The calculation of 25 cubic metres per feddan per 24 

 hours for irrigation, other than of rice, can be applied to 

 large Government canals, but for small agricultural canals 

 and irrigation channels the carrying capacity must greatly 

 exceed this rate. On a large estate, it may be necessary 

 to sow say 50 feddans of berseem in one plot of summer 

 fallow deeply cracked and very dry. If the little channel 

 only carried 25 x 50 = 1250 cubic metres it would irrigate 

 3 feddans a day of such land and the plot would take 17 

 djiys to sow. It should be done in about 3 days. 



When dealing with a block of 500 feddans we do not 

 require to sow the whole area at once ; it. is probably under 

 various crops, and only a part requires sowing at one time. 



Taking a still larger area such as 5000 feddans the canal 



