x4.08 Farming the Desert

Government policies actively promoted desert expansion across the region

Trees were cleared for farms, firewood, and construction, removing vegetation that retained water in soil

Increased rainfall and flooding damaged the soil structure

Natural climate cycles created periodic droughts lasting several centuries

The tunnels created a barrier that stopped evaporation from the soil surface

The tunnels prevented rainwater from flowing away and allowed it to sink deep into the soil

The tunnels attracted more rainfall to the region during dry seasons

The tunnels redirected groundwater toward the surface for plant roots

He imported fertile topsoil from neighboring regions to replace degraded land

He constructed underground channels to redirect all water directly to his crops

He used stone walls to slow runoff, planted trees to protect soil, and relied on tree roots to help retain water

He created shallow ponds that would evaporate water slowly over the season