Hy was the basin system of irrigation largely abandoned by farmers near the nile river in modern times?

Because it only support the planting of one main crop, meanwhile perennial system allow the planting of multiple crops

The basin system can only supported one type of crops because it really depended on nile river's annual flooding, which make it far Less effective than the Perennial system. So many people in modern times started to switch to Perennial system

Answer: the philippines has suffered from an inexhaustible number of deadly typhoons, earthquakes, volcano eruptions and other natural disasters. this is due to its location along the ring of fire, or typhoon belt – a large pacific ocean region where many of earth's volcanic eruptions and earthquakes occur.

Here is a picture  of the net. its 4 squares in a row diagonal and on the third draw one square aove and under