Completed in 1972 it has achieved both, but the fertility of Egyptian farming land is now falling as it is cut off from the yearly layer of fresh nutrients brought by the flood.
Before 1972, the flood would often wash away crops on Egyptian farming land.
mnli hypothesis: Before 1972, the flood would often wash away crops on Egyptian farming land. premise: Completed in 1972 it has achieved both, but the fertility of Egyptian farming land is now falling as it is cut off from the yearly layer of fresh nutrients brought by the flood.