FOG HARVESTING -INTRODUCTION

1.

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ho

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MESH CONCEPTS CC

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WR

M)

What is Fog Harvesting?

1.Fog is a familiar occurrence .

2.The m

oisture content of fog differs depending on

location

3.Mountain fog is wettest followed by Coastal fog.

4.Water droplets are collected on a net system.

5.On a good day as much as 18 litres per m2 of netting

can be collected.

6.Cape Colombine has 80 fog days per year.

7.The nets also catch and store rainfall.

8.Suitable for human consumption, reforestation,

working for fire, water bottling.

A TRIANGULATED SYSTEM

COMPARISON TO OTHER WATER SOURCES

Fog harvesting :

�is weather dependant.

�Is environmentally neutral.

�Quick to install.

�Is a complementarysystem that will provide clean potable

water.

�A triangulated system of 9 nets can produce up to 2000 litres a

day on average.

�Infrastructure costs for storage and piping can be expensive in

remote areasbut primarily gravity fed

�Cost benefit studies favour dams and desalination because of

the huge volumes of water involved .

�Dams and desalination not always viablein remote areas.

�Environmental d

amage –costs of rehabilitation are largely

ignored in desalination cost studies.

GLOBAL RESEARCH LOCALITIES ( WIKIPEDIA)

So

uth

Afr

ica

ha

s a

nu

mb

er

of

test

sit

es

an

d o

ne

op

era

tio

na

l sy

ste

m is

the

Tra

nsk

ei

WHERE IS THIS TECHNOLOGY BEING

APPLIED?

•O

the

r co

un

trie

s n

ot

on

ma

p-

Mo

rro

co,

Eri

tre

a,

Ve

nzu

ela

,

Cro

ati

a,S

pa

in,G

ua

tam

ala

POTENTIAL FOR FOG HARVESTING IN SOUTH AFRICA

POTENTIAL IS LARGELY UNDETERMINED.

�Potential has been investigated by W

RC.

�Astatistical model to determ

ine optimum site placement.

�An experimental system was tendered in M

phumalanga. Not

awarded. (2011).

�A fog m

ap has been published identifying possible sites

CRITERIA FOR THE SELECTION OF A FOG HARVESTING SITE

�Frequency and duration of fog events.

�Moisture content of fog.

�Altitude.

�Wind speed and direction

�Topography

�Efficiency of collection system

U-TUBE VIDEO –CABAZANA

EASTERN CAPE

www.youtube.com/watch?v=osYlqV2fcUs

DUNCAN EVANS

Cell 0734165279

Email

meshconcepts@

polka.co.za

THE WAY FORWARD

•DEAL WITH VESTED INTERESTS W

RC/UP/D

WA/INDIVIDUALS

•Review and m

onitor current research and expenditure

•Recognition of the research that has been done to date. (private & public)

•Accept technology in its context of being a complementary source of water.

•Recognition of patent rights.

•Im

plement working systems ( enough research local &

international)

•Monitor and document all sites.

•Review findings to improve technology and placing criteria.

•Set up a Carbon (green)Credit programme to attract private sector finance.