Fog Nets can be used to harvest water from fog or during rainy drizzle, store it and use it as filtered water for human or animal use or irrigation.
Sizing
Using correct fog netting, harvests 3L/sqm /day, or during rain you could fill a 200L tank in one day.
Assuming drizzle… Targeting 200L caught over 5 days, so catching 40L/day. Requires 13sqm of net.
200L drum/3L per day net harvesting = nets of 66sqm/day. So over 5 days = 13sqm.
Requiring only
- 3 of 3mx2m (6sqm) fog catches that each catch 18L per day. Or
- 4 of 2mx2m (4sqm) that each catch 12L per day.
Placement
Along fencing, high up for gravity water flow, inbetween tree planting paces. It should not block sunlight to plants.
2 at top of hill ridge offering 2x 200L
1 at Avacado road side
Design
- Two erected posts. 5m long,
- (1m inground, +1.6m above ground, +2.4m net height).
- Netting has wire rope sewn onto hem, all 4 sides.
- Wire is tightened inbetween posts using turnbuckles. Or stretched taught using rubber bungee hooks.
- A PVC Gutter is at bottom, ends capped, angled for gravity flow. Piped to tank storage.
Materials
Need:
- 2 log posts
- Steel wire,
- Wire fastners, turn buckles, swage tool
- Permeable Sunscreen shade cloth mesh
- UV resistant String as thread for edging.
- Long cable ties.
- PVC pipe as gutter.
- Angled down for water gravity flow.
- Gutter opening minimised to reduce evaporation, but can’t make contact with net, to avoid external leakage.