Sewage treatment plant and shaduf: what they have in common

1. Step 1. Sewage treatment plant — is part of — Sewerage. Treatment plants.
2. Step 2. Sewerage — uses — Gravity flow. Waste water flows down a gradient.
3. Step 3. Gravity flow — is used in — Water wheel. Falling or flowing water turns the wheel.
4. Step 4. Water wheel — is used in — Noria. The current itself turns the wheel.
5. Step 5. Noria — is used in — Irrigation. Norias lifted water into canals.
6. Step 6. Irrigation — uses — Shaduf. The shaduf fed water into the canals.

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