Water

1. Collecting rainwater

2. Recycling dirty water

3. Drainage system

4. Irrigation system

5. Dehumidifier

6. Water filtration

6.1. Ceramic filter

6.1.1. Reverse Osmosis

6.1.1.1. Alkaline/Water Ionisers

6.1.1.1.1. UV Filter

7. Improving efficiency of already made designs (e.g-Groundwater pumps)

7.1. Moisture readers for farmland to control soil moisture, preventing over watering crops

7.1.1. Water meter

7.2. Reducing energy usage

8. Storage of water

8.1. Tank

9. Improving drainage systems

9.1. Pipe work

9.1.1. Increasing water flow

9.1.2. Valves

10. Wind turbines