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- Around these cities they practiced runoff agriculture .
- Runoff is also governed by the number and the length of streams in the basin .
- This runoff, of course, was absorbed by the accumulated soils of the farm plots .
- Stripping the land in these ways allows faster surface runoff and exacerbates flooding .
- The cultivated field received not only its own share of rainfall but all of the runoff from the catchment .