This document provides an executive summary of a proposed WaterProducer-Greenhouse Project for Grand Turk island. The system utilizes reverse geothermal gradients in ocean islands to obtain natural coolant from deep saline groundwater wells. This coolant is used in dehumidification processes to produce fresh water from air inside a greenhouse, along with crops. The project aims to improve water and food security while providing local business opportunities through various ventures like bottled water, produce sales, and greenhouse tours. A $5 million investment is estimated to establish the business, which is projected to be profitable within 3 years and benefit the regional economy.

1. Water + Food™
(a division of) Canadian Dew Technologies Inc.
© 2011, Water + Food (a division of) Canadian Dew Technologies Inc.
2116 Grand Boulevard, North Vancouver, BC V7L 3Y7 Canada
Telephone/Fax: 604.985.3720 E-mail: waterplusfood@shaw.ca Web site: www.waterplusfood.com
Turks and Caicos Islands: Séamus Day, 649.231.2849, seamusday@gmail.com
Page 1 of 4
Executive Summary
WaterProducer-Greenhouse Project for Grand Turk
Discover new business opportunities with our WaterProducer-Greenhouse —an innovative
system for improving water and food security on tropical small islands like Grand Turk.
Tropical small islands classified geologically as volcanic, limestone, or coral atolls situated
between 30°N to 30°S latitudes in the Pacific, Atlantic, and Indian Oceans are the focus of our
system’s design. Ocean water permeates small islands, especially those made of limestone.
Therefore, saline groundwater temperature decreases with depth— a reverse geothermal
gradient.* Deep wells, drilled to the 200–500 m depth can obtain natural coolant for the
dehumidification process in our system producing fresh water from the air.
* Inside the limits of continental shelves (water depths less than 200 m), groundwater temperatures increase with depth (normal
geothermal gradient) precluding groundwater use as a natural coolant for our system.
Airflow
Airflow
Water-chilled coils and
exhaust fans
Cool Zone
Water-producing greenhouse
zone between evaporator pads
© 2008, Roland V. Wahlgren
Natural coolant from saline groundwater exploits the reverse geothermal gradient—a sustainable resource—
with minimal environmental impact. Unlike desalination, no harmful brine is produced.
Designed for small
tropical islands
from 30°N to 30°S in
the Pacific, Atlantic,
and Indian Oceans.
Cool inside—by
evaporative cooling—
suits temperate climate
crops.
Clean water
production rate is
about 200,000 L/d by
condensing moisture
from the air.

2. Water + Food™
(a division of) Canadian Dew Technologies Inc.
© 2011, Water + Food (a division of) Canadian Dew Technologies Inc.
2116 Grand Boulevard, North Vancouver, BC V7L 3Y7 Canada
Telephone/Fax: 604.985.3720 E-mail: waterplusfood@shaw.ca Web site: www.waterplusfood.com
Turks and Caicos Islands: Séamus Day, 649.231.2849, seamusday@gmail.com
Page 2 of 4
Business opportunities
Entrepreneurs can use the WaterProducer-Greenhouse as the core of a successful
commercial enterprise profiting from diverse ventures including:
Import substitution for bottled water, fresh vegetables, and fruit;
Sales of fresh vegetables and fruits to distributors, wholesalers, retailers, restaurants,
and value-added manufacturers (e.g. salsas, juices);
Sales of fresh water to local government, water tankers, breweries, and water-bottling
businesses;
Export sales of premium brand 500 ml water bottles;
Sales of value-added "sports drinks" (electrolytes added); and
Selling greenhouse tours and bottled water to cruise ship tourists.
At the regional economic level, the WaterProducer-Greenhouse can have a positive
impact on regional economies, much as would a new resort, hotel, railway, or cruise ship
terminal.
The diagram shows a typical business model.
Local
operating
company
Local water
bottling
company
Local food
manufacturer
& exporter
Local
restaurateur
Local
commercial
nursery
Canadian
Dew
Technologies
Inc.
(Canada)
Batavia
Greenhouse
Builders Ltd.
(Canada)
Your formula for profit
Water + Food™ = Health + Self sufficiency + Sustainability
Socio-economic engine:
The WaterProducer-
Greenhouse can have a
positive impact on regional
economies, much as would
a new resort, hotel, railway,
or cruise ship dock.

3. Water + Food™
(a division of) Canadian Dew Technologies Inc.
© 2011, Water + Food (a division of) Canadian Dew Technologies Inc.
2116 Grand Boulevard, North Vancouver, BC V7L 3Y7 Canada
Telephone/Fax: 604.985.3720 E-mail: waterplusfood@shaw.ca Web site: www.waterplusfood.com
Turks and Caicos Islands: Séamus Day, 649.231.2849, seamusday@gmail.com
Page 3 of 4
Financial and Commercial Information
Establishing the proposed business requires USD 5 million (estimate from 2003).
Candidate crops include tomatoes, sweet peppers, cucumbers, eggplants, beans, herbs,
lettuces, and strawberries. Cut flowers such as chrysanthemums and Asiatic lilies may be
grown. The greenhouse can fill demand for a population of 3500 for the listed produce.
Revenue would be derived from sales of vegetables/fruit (25%) and bottled /piped water
(75%).
Required Financing & Sources for a Water-producing Greenhouse installation including an
autonomous wind-diesel power supply (USD, Grand Turk Business Plan; 2003)
$4,948,120 Required to establish and operate the business
$1,440,355 Start-up, buildings, construction
$72,760 Land (leased); site improvements
$3,085,005 Equipment/mechanical/electrical
$100,000 Intellectual property rights (non-
exclusive)
$250,000 Operating capital
$469,812 Equity capital
$4,478,308 Borrowed capital
Projected Income, Net Worth, and Return on Investment (USD, Grand Turk Business Plan; 2003)
Item Year 1 Year 2 Year 3
Revenue 5,801,166 9,038,758 12,026,771
Net Income -494,416 309,329 1,062,100
Net Worth -122,911 599,505 1,825,623
Return on
Investment
-10.6% 6.0% 16.8%
Project History
In August 2001, the Canadian International Development Agency approved a Contribution
Agreement* (approx. $160,000) to Batavia Greenhouse Builders Ltd. of Aldergrove, British
Columbia, Canada. Our design for a water-producing greenhouse, which manufactures freshwater
for vegetable crop irrigation, was the basis for a comprehensive viability study (approx.
$200,000) for a proposed facility on Grand Turk, Turks and Caicos Islands. The reports,
completed in 2003, addressed technical feasibility, financial and commercial viability, analysis of
the regulatory framework, environmental impact, a training plan, gender issues and social
integration, and ultimately, a joint venture agreement for operating a commercial greenhouse. The
experience gained in the Grand Turk study was invaluable and applies to other tropical small
island projects. Please visit our web site www.waterplusfood.com for summaries of all our
reports. Full text copies available on request.
*Contribution Agreement: E4936-K060831
Disclaimer: Financial values are
illustrative only, and are subject to
change with material and labour
costs, land costs, and financing
arrangements.

4. Water + Food™
(a division of) Canadian Dew Technologies Inc.
© 2011, Water + Food (a division of) Canadian Dew Technologies Inc.
2116 Grand Boulevard, North Vancouver, BC V7L 3Y7 Canada
Telephone/Fax: 604.985.3720 E-mail: waterplusfood@shaw.ca Web site: www.waterplusfood.com
Turks and Caicos Islands: Séamus Day, 649.231.2849, seamusday@gmail.com
Page 4 of 4
Technical Information
Twenty-seven exhaust fans force humid tropical air at 1.52 m/s through a 3,500 m2
greenhouse.
There is one air change every minute. Pumps cause cool (13–15°C) salty (35-36‰) groundwater
from four wells* 300–500 m deep to flow through 27 water-cooled coils. Total flow is 256 L/s.
The aluminum-finned copper-nickel coils are colder than dew point. Airflow moisture turns into
pure fresh water collected in a reservoir for crop irrigation and distribution as drinking water.
Modeled energy consumption is 5200 kWh daily, with a power requirement of 220 kW. Fresh
water energy cost is 25 kWh / m3
(compare this with reverse-osmosis needing 17-23 kWh/m3
).
Coefficient of performance is 2–17 depending on weather conditions.
*Wells need to be as deep as 500 m to access saline groundwater below the surrounding ocean’s thermocline. Water
temperature must be cool enough for efficient dehumidification of ambient outdoor air flowing through the
WaterProducer-Greenhouse system. Deep wells are feasible in limestone islands such as those in the Bahamas and
Turks and Caicos, examples of old carbonate islands. Permeability to water flow is quite high. At depths exceeding 15
m, coral atolls such as Nauru, Niue, many Tongan islands, Christmas Island, Kiribati, Tuvalu, Marshall Islands,
Maldives, some of the Seychelles, and the Cocos (Keeling) Islands are fundamentally limestone. Confirm sufficient
permeability at a site by drilling a test well before proceeding with a site-specific project. Volcanic rock at 100’s
of metres depth is usually not permeable enough for pumped wells. On an island with low permeability, pipelines or
bundles of hoses extending to a suitable ocean depth would pipe the natural coolant water to the WaterProducer-
Greenhouse system.
Viability Study undertaken with the financial support of the Government of Canada provided through the Canadian
International Development Agency (CIDA)
Proven technologies such as evaporative
cooling by fan & pad systems, industrial
dehumidification with water-chilled coils, soil-less
(hydroponic) horticulture, water-bottling and
autonomous wind-diesel power combine to make
an effective freshwater-producing system.
No salt residual
would remain in
our product water,
unlike reverse-
osmosis product
water, which
typically contains
300–500 ppm of
salt.