1877. ============+======+========+======+======+======+======+=============== Date at |Gauges| Dis- |Water |Trough| Dis- |Gauges| Date at Assuân. | at | charges| con- | of |charge| at | Cairo. | As- | at | sump-| Nile | at |Cairo.| | suân.| Assuân.| tion |Assuân|Cairo.| | | | |Assuân| to | | | | | | to |Cairo.| | | | | |Cairo.| | | | ------------+------+--------+------+------+------+------+--------------- August 5| 4·8 | 4200 | -800 | -300 | 3100 | 3·9 |10th August. „ 10| 5·4 | 5100 |-1020 | do | 3780 | 4·6 |15th „ „ 15| 5·8 | 5700 | do | do | 4380 | 5·0 |20th „ „ 20| 6·4 | 6500 | do | do | 5180 | 5·5 |25th „ „ 25| 6·1 | 5800 | do | do | 4480 | 5·1 |31st „ | | | | +------+------+--------------- „ 31| 6·2 | 6000 | do | do | 4680 | 5·2 | 5th September. ------------+------+--------+------+------+ | | September 5| 6·3 | 6200 | do | do | 4880 | 5·3 |10th „ „ 10| 6·1 | 5800 | do | +200 | 4980 | 5·5 |15th „ „ 15| 6·1 | 5700 | do | do | 4880 | 5·4 |20th „ „ 20| 6·0 | 5700 | do | do | 4880 | 5·4 |25th „ „ 25| 6·3 | 6200 | do | do | 5380 | 5·6 |30th „ | | | | +------+------+--------------- „ 30| 6·1 | 5800 | do | do | 4980 | 5·4 | 5th October. ------------+------+--------+------+------+ | | October 5| 5·6 | 5100 | do | do | 4280 | 5·0 |10th „ „ 10| 5·2 | 4500 | do | do | 3680 | 4·6 |15th „ „ 15| 4·9 | 4200 | -950 | do | 3450 | 4·4 |20th „ „ 20| 4·6 | 3800 | -900 | do | 3100 | 4·0 |25th „ „ 25| 4·5 | 3600 | -850 | do | 2950 | 3·9 |31st „ | | | | +------+------+--------------- „ 31| 4·0 | 3100 | -800 | do | 2500 | 3·5 | 5th November. ------------+------+--------+------+------+ | | November 5| 3·7 | 2800 | -700 | do | 2300 | 3·3 |10th „ ============+======+========+======+======+======+======+=============== TABLE LII.--_Calculated Cairo gauges corresponding to Assuân gauges if basin irrigation were to be changed into perennial irrigation._