National Water Research Group Mauritius Research Council (MRC - - - PowerPoint PPT Presentation

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National Water Research Group Mauritius Research Council (MRC - - - PowerPoint PPT Presentation

Mauritius Research Council National Water Research Group Mauritius Research Council (MRC - Chair) Agricultural Research & Extension Unit (AREU) Albion Fisheries Research Centre (AFRC) Association des Hteliers et Restaurateurs de l'le


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SLIDE 1

Mauritius Research Council

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SLIDE 2

National Water Research Group

Mauritius Research Council (MRC - Chair) Agricultural Research & Extension Unit (AREU) Albion Fisheries Research Centre (AFRC) Association des Hôteliers et Restaurateurs de l'île Maurice (AHRIM) Central Water Authority (CWA) Irrigation Authority (IA) Manser-Saxon Contracting Ltd Mauritius Meteorological Services (MMS) Mauritius Standard Bureau (MSB) Ministry of Energy & Public Utilities (MEPU) Ministry of Environment and Sustainable Development (MoESD) National Environmental Laboratory (NEL) Road Development Authority (RDA) Scene-Ries Consult Ltd University of Mauritius (UoM) University of Technology (UTM) Water Research Co Ltd Water Resources Unit (WRU)

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SLIDE 3

Role of the NWRG

  • Interdisciplinary Steering Committee involving

public and private sector stakeholders

  • Looked at the current water crisis from a

Research Perspective

  • Identified possible research to be carried out

to try to alleviate water crisis in Mauritius

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SLIDE 4

Aims & Objectives of NWRG

  • Devising research avenues to alleviate water

shortage issue in short, medium and long term through the following:

  • Identifying critical issues on water resources

for Mauritius

  • Prioritising

research themes in water resources management

  • Coordinating

and facilitating research activities related to the water shortage issue

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SLIDE 5

Current Status

  • Annual rainfall of about 2000mm -

corresponds to an annual volume of about 3700 Mm3

  • Over last century, rainfall data recorded in

Mauritius shows a general decreasing trend

  •  groundwater recharge
  •  water demand
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SLIDE 6

Water Production

Zone Normal Production/m3 per day Port-Louis 100,000 North 123,000 East 72,000 South 75,000 Mare aux Vacoas – Upper 114,000 Mare aux Vacoas - Lower 110,000 Total 594,000

Courtesy: Central Water Authority

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SLIDE 7

Annual Rainfall Pattern (1990 - 2010)

Courtesy: Mauritius Meteorological Services

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SLIDE 8

Rainfall Pattern

Courtesy: Mauritius Meteorological Services

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SLIDE 9

Comparison between Mare aux Vacoas reservoir and Midlands Dam

20 40 60 80 100 2006 2007 2008 2009 2010 2011

MAV MDL

Water Level/% Year

Courtesy: Mr Prem Saddul

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SLIDE 10

Rainwater Utilisation

Courtesy: Water Resources Unit

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SLIDE 11

Rainwater Utilisation

35% 30% 12% 23%

Run-off to sea Evapotranspiration Resources to be developed Utilised water

35% 30% 2% 10% 23%

Run-off to sea Evapotranspiration Development by 2015 Resources to be developed Utilised water

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SLIDE 12

9 Areas of Research Prioritised

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SLIDE 13

Areas of Research identified by NWRG

  • 1. Investigating potential

ways to limit loss through runoff a) Impact of urbanization on recharge of aquifers by infiltrated rain-water. b) Solutions to limit water run-off caused by urbanisation c) Groundwater Basin modelling studies

  • 2. Revalorising Rainwater

Collection a) Investigating optimal practices for rainwater collection, storage and use. b) Sensitizing the population to make use of rainwater for some domestic activities. c) Testing irrigation systems in regard to water use efficiency and crop productivity d) Investigating new methods to

  • ptimize

irrigation water use under drought conditions while sustaining crop yield

  • 3. Investigating the causes of the

critical water level in Mare aux Vacoas reservoir a) Investigating the impact of deforestation and land use on the hydrological cycle of the Mare- aux-Vacoas region b) Devising Scientific guidelines to facilitate future planning of water resources of the MAV and also to develop appropriate adaptation strategies.

  • 4. Investigating novel ways

for optimal use of recycled waste water a) Proposing new ways to optimize the use of recycled waste water, e.g. for irrigation etc. b) Use of renewable energy and new technologies for water treatment c) Assessing the risks of contamination of fresh water by sewage and fertilisers

  • 5. Studying the feasibility of implementing larger

scale desalination of sea water as an alternative water supply a) Investigating the use of renewable energy for water desalination b) Recommendations for eco-friendly use or disposal of brine obtained from desalination

  • 6. Monitoring

surface & ground water resources a) Characterisation of the extent of the surface and ground-water interaction b) Investigating on a dynamic system to optimise exploitation of both Surface Water and Ground Water – (currently being carried out in part by the WRU)

  • 7. Evaluating the

impacts of water quality on Health

a) Studying the vulnerability of groundwater and surface water to land-use activities b) Identification of potentially acceptable measures to minimize the impacts of land-use activities. c) Study on the cost implications for water treatment in the future d) Assess the level of a range of commonly used herbicides and pesticides in our surface and ground water and identify eventual correlation with frequency of cancer and other diseases in target populations.

8 Impacts of climate change

  • n Mauritius

Studying the impact of climate change and climate variability on rainfall in Mauritius

  • 9. Investigating innovative

ways to reduce evapotranspiration a) Finding sub-terrain reservoirs to store water b) Assessment of measures to reduce evapotranspiration, for example:  Floating covers  Shade structures  Chemical covers  Biological covers

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SLIDE 14

Existing Alternatives

  • Desalination Technologies
  • Rainwater Harvesting
  • Cloud Seeding
  • Solid Rain
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SLIDE 15

Desalination Technologies

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SLIDE 16

Small Scale Solar Desalination in Mauritius

UNDP Funded Project

  • Name: Solar Water

Desalination in Coastal Villages

  • Location: Rodrigues, Mauritius
  • Date: September 1997
  • Cost of equipment: $200-$250

per still

  • Capacity: Produces 3-7 liters of

drinkable water per 10 liters of seawater in one day

  • Number Served: 21

households

Source: http://sgp.undp.org/download/SGP_Mauritius.pdf

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SLIDE 17

Typical Seawater Desalination Facility within Coastal Zones

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Financial Investment

  • 3 levels of energy recuperation strategy

Energy used (kWh/m3) Energy costs (MUR/m3) Total Cost per m3

  • f water produced

(MUR/m3)

i)

No energy recuperation 7-8 43 58

ii)

Turbine energy recuperation 4-4.5 28 43

iii)

Pressure exchanger energy recuperation 2.2–2.5 14 29

Courtesy: Scene-ries

Capital Costs 500m3-600m3/day plant (with top-of-range pressure exchanger energy recuperation) MUR 22-25 million Operating Costs % of overall cost Costs of chemicals 20-25% Costs of cartridges and membranes 15-20% Electricity costs 60-65%

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SLIDE 19

Carnegie CETO Wave Energy Desalination

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SLIDE 20

Global Potential Site Pipeline

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SLIDE 21

Rainwater Harvesting (RWH)

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RWH – Initiative of the MRC

  • Small-scale

rainwater collection systems to provide individual households or single communities with a primary or supplementary water supply

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RWH – Initiative of the MRC

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RWH Potential in Mauritius

  • Can be considered as a short-term solution
  • Both public and private buildings in Mauritius
  • ffer high surface exposure for rainwater

capture

  • Water collected to be used primarily for

cleaning and irrigation purposes

  • Water treatment is required to obtain potable

water, which would entail additional cost

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SLIDE 25

aquapura Water Treatment Systems

Implementation at Yusuf Meherally Centre, Tara Village, District Raigad, Maharashtra Courtesy of

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SLIDE 26

Waterloc – Storm Water Collection

Courtesy: waterloc-nicoll

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SLIDE 27

Waterloc – Storm Water Collection

Courtesy: waterloc-nicoll

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SLIDE 28

Cloud Seeding

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SLIDE 29

Cloud Seeding Overview

Aerial Cloud Seeding Ground-Based Cloud Seeding More efficient and accurate

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Scope for Cloud Seeding in Mauritius

  • Feasibility study carried out by MRC, 1999

– 10 to 20 % increase in seasonal rainfall can be expected through a well-designed seeding program

  • Priority 1: Dynamic cloud seeding

– Designed to make the most significant rain

  • Priority 2: Hygroscopic cloud seeding

– Can allow Mauritius to seed warm clouds (>0oC) and can beneficially modify colder clouds

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SLIDE 31

Solid Rain

  • Captures water in a solid for irrigation
  • Potassium Polyacrylate – Chemical substance

capable of adhering to plant roots that stores water by transforming it into a gel

  • Each kilogram can gel 500 liters of water
  • Blocks of water placed underground and they

replenish themselves after each shower

  • Useful lifetime of between 8 and 10 years
  • Enables development of more economical

new irrigation systems, particularly in drought zones

Potassium Polyacrylate

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Concluding Remarks

  •  water footprint per capita in Mauritius – water-stressed nation
  • Each and every citizen should contribute towards alleviating the

water problem

  • Requires education, mobilization and involvement of the Mauritian

society Recommended measures to facilitate research activities:

  • Improving and sharing knowledge and information on climate,

water and adaptation measures

  • Investing in comprehensive and sustainable data collection and

monitoring systems

  • Advocating for enhanced funding towards optimal use and

management of water resources

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SLIDE 33

Acknowledgement

(Steering Committee NWRG) Agricultural Research & Extension Unit (AREU) Albion Fisheries Research Centre (AFRC) Association des Hôteliers et Restaurateurs de l'île Maurice (AHRIM) Central Water Authority (CWA) Irrigation Authority (IA) Manser-Saxon Contracting Ltd Mauritius Meteorological Services (MMS) Mauritius Standard Bureau (MSB) Ministry of Energy & Public Uitilities (MEPU) Ministry of Environment and Sustainable Development (MoESD) National Environmental Laboratory (NEL) Road Development Authority (RDA) Scene-Ries Consult Ltd University of Mauritius (UoM) University of Technology (UTM) Water Research Co Ltd Water Resources Unit (WRU)

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SLIDE 34

Mauritius Research Council Level 6, Ebene Heights 34, Cybercity Ebene Mauritius Tel: (230) 465 1235 Fax: (230) 465 1239 Email: mrc@intnet.mu Website: http://www.mrc.org.mu

(All correspondence should be addressed to the Executive Director)