Where is the rainfall centered since 7000 bc in the month of january

Before 1000 bc the sahara region received abundant rainfall, from 10 to 50 times as much as it does today. As a result, may groups of people once inhabited this lush and fertile section of Africa. Areas of heavy rainfall around 10,000 – 7000 bc july is the in the central Africa.

answer:

tanner dumping, drying up and urban sewer drainage