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Ministry of Energy and Public Utilities

Water sector


Water Resources in Mauritius​

Ground Water Resources​

Main water indicators, 2011 - 2015​

Reservoir​

 

The Ministry of Public Utilities is responsible for the water sector. It formulates policy and strategy for the mobilization and conservation of water resources and management of supply and distribution of water. It is also responsible for implementation of projects for the construction of reservoirs and related infrastructure.

The Water Resources Unit operates within the Ministry and is responsible for implementation of water mobilization projects. It was established in May 1993. Its functions are:-

​a. To study and formulate policy in relation to the control and use of water  resources;

b.   To keep a data base of water resources;

c.  To prepare and follow up plans for the conservation, utilisation, control and development of water resources.

d.    To co-ordinate and scrutinise the projects undertaken by any person   relating to the conservation, utilisation and development of water resources and to assess the technical possibilities, benefits and socio-economic feasibility of the project.

e.   To conduct and co-ordinate research and investigation on the economic use of water.

f.   To promote, design and construct, in consultation with appropriate authorities, schemes and works for the purpose of conservation and development of water resources

g.   To ensure that water supply conforms with such standards as are laid by law.

h.   To monitor the construction of major dam projects

i.     To ensure the regular maiantenance of the dams

j.     To implement integrated water resources management

 


 

Water resources in Mauritius

The main source of water supply is  ground water (54%) – abstracted through 112 boreholes. The balance (46%) is derived from surface sources – impounding reservoirs and river in takes. 25 major catchment areas

Water resources

        •         22 minor river basins

        •         107 flow measuring station

        ·         350 river-run off takes

        ·         3 major river abstractions

        ·         6 major impounding reservoirs total capacity = 77.4 Mm3 annual yield = 137 Mm3


 

Ground water resources

There are 5 main aquifers in Mauritius.

 429 boreholes -  133 domestic (90%) , 157 irrigation (5%),  139 industrial (5%)


 

Main water indicators1/, 2011 - 2015

Details

Unit​

2011

2012

2013

2014

2015

Mid-year population

thousand

1,212  

1,215  

1,217  

1,219  

1,263  

Mean annual rainfall

 

 

            Island of Mauritius2/

Millimetres

1,948  

1,621  

2,126  

2,094  

2,377  

            Island of Rodrigues
                          Pte Canon2/

Millimetres

849  

1,041  

978  

1,145  

1,272  

                          Plaine Corail2/

Millimetres

842  

853  

871  

1,143  

1,338  

Potable water produced

Mm3

203  

215  

217  

229  

245  

Potable water consumed

Mm3

96  

95  

96  

97  

98  

Potable water produced per capita per day

litres

458  

484  

487  

514  

549  

Potable water consumed per capita per day

litres

218  

214  

216  

218  

220  

Consumption per capita  per day for 'Domestic' tariffs

litres

167  

164  

165  

167  

168  

Average price per m3

Rs/m3

8.75  

11.90  

12.12  

12.21  

11.79  

1/ All data refer to Island of Mauritius, except for rainfall where figures are available for Rodrigues as well.

2/   Revised


 

 



 



RESERVOIRS

Mare aux Vacoas Reservoir

Mare aux Vacoas is the largest reservoir in Mauritius. It is located in Plaines Wilhems, in the southwest of the island, to the south of the town of Curepipe. It has a capacity of 25.89 million cubic metres and provides water to the upper Plaines Wilhems and to Moka.




Description: http://images.boomsbeat.com/data/images/full/42283/6-jpg.jpgDescription: http://bungalowvanille.com/gfx/pages/forum/misc/mare-aux-vacoas-full.jpg 

 

In 1885, a masonry dam of one metre height was built across Riviere du Tamarin in the marshy land at Mare aux Vacoas draining an area of 13 km2. . In 1892, the level of the dam was raised to an elevation of 558.54 m (amsl) and the capacity of the reservoir to 2.58 Mm3 . In 1915, after a prolonged drought, the level of the dam was raised to an elevation of 560.06 m and the storage capacity to 5.27 Mm3 . The purpose of the dam was to store water for domestic water supply.  In 1922, Tatamaka feeder canal was constructed to divert water from Riviere du Poste into the MAV reservoir. The carrying capacity of the canal is presently 4.25 m3 /s and the annual contribution is of the order of 15 Mm3 .

 In 1928, with the contribution of the Tatamaka Feeder Canal, the reservoir capacity was further raised to 16.15 Mm3 , and  in 1961 to 27.63 Mm3 with a water spread area of 5.6 km2  In 1971, Parc aux Cerf Feeder Canal was constructed to divert flow from the upper catchment area of River Citron and North East part of the local catchment. The average annual contribution of the canal is 1.75 Mm3 .

 In 2002, the Pradier Canal was constructed to increase the inflow into MAV reservoir.

Purpose : Potable Water Supply

A hydrographic survey of the reservoir was carried out for the first time in the year 1996, and the gross storage capacity of the reservoir determined as 25.89 Mm3 and finally in

 

La Nicoliere Reservoir

Description: https://i.ytimg.com/vi/LGYS3ZJ_-To/maxresdefault.jpg 

La Nicolière Reservoir , constructed in the year 1929 across River du Rempart, near Grande Rosalie, is one of the main sources of water supply to the northern districts of Mauritius and part of Port Louis. Its water is used for domestic, industrial and irrigation.

 The reservoir has a storage capacity of 5.26 Mm3 . The annual average regulated yield from the reservoir of the order of 30 Mm3 has increased by about 41 Mm3 after the contrustion of Midlands Dam in December 2002. It is fed by the La Nicolière Feeder Canal (LNFC), River du Rempart and eleven small streams. RIVER G.R.S.E And R. Rempart FRANCOISE * diverted to La Nicolière Feeder Canal VACOAS On River du Rempart (North), in the district of Pamplemousses about 5 kms North East of Port Louis.

In December 2002, the Midlands Dam was constructed to serve as a buffer reservoir to La Nicolière Reservoir.

 (i) La Nicolière Feeder Canal from GRSE, designed capacity of 4.25 m3 /s and of length 27 km 7.75 km2 1929 Salient features of La Nicolière Reservoir 5.26 Mm3 after hydrographic survey of 1996 Homogenous Earthen Embankment 13.5 m above ground level Ungated ogee shaped concrete spillway 1.08 km2 30 Mm3 prior to Midlands dam and 71 Mm3 after Midlands Dam.

(ii) River du Rempart 819.08 m 249.02 m (amsl)

 (iii) Streams in local catchment Potable, industrial and irrigation water supply 36.58 m (2 bays of 18.29 m each) Nicoliere Feeder Canal from G.R.S.E Catchment Spills into Riv. Du Rempart Riv. Du Rempart (North) NP5 11 No. Small Streams

 

Piton du Milieu

Description: http://mauritius.voyaz.com/Assets2/galleries/images_galleries/Horizontal/piton_du_milieu.jpg 

 

Salient features of Piton du Milieu Reservoir Location : Year of Construction : 1952

Catchment Area : 6.30 km2

Mean Annual Rainfall : 3529 mm

Feeders : River Vacoas River Bateau Seasonal Streams Regulated

Annual Yield : 8.3 Mm3 Reservoir Capacity : 2.99 Mm3 after hydrographic survey of 1996 Dead Storage : 0.10 Mm3 Full Reservoir Level : 438 m (amsl)

Type of Dam : Earth dam Maximum height of dam : 13.5 m (above foundation level)

Length of Dam : 836.16 m

Type of spillway : Ungated concrete crest wall With of Spillway :

 Purpose : Domestic Water Supply 363.12 m (2 spillways)

 PITON DU MILIEU RESERVOIR NATURAL STREAMS River Bateau River Vacoas Piton du Milieu Reservoir is situated in the district of Moka. It is fed mainly from River Vacoas and Bateau. It serves water for domestic use in the East District Water Supply system. Piton du Milieu in Moka district, about 20 kms South East of Port Louis

Maximum height of dam : 13.5 m (above foundation level)

Length of Dam : 836.16 m

 Type of spillway : Ungated concrete crest wall With of Spillway :

Purpose : Domestic Water Supply 363.12 m (2 spillways)

PITON DU MILIEU RESERVOIR NATURAL STREAMS River Bateau River Vacoas Piton du Milieu Reservoir is situated in the district of Moka. It is fed mainly from River Vacoas and Bateau. It serves water for domestic use in the East District Water Supply system. Piton du Milieu in Moka district, about 20 kms South East of Port Louis .

 

La Ferme Reservoir

Description: http://africamoney.info/wp-content/uploads/2014/07/La-Ferme-reservoir.png 

 

 

Location : Near Bambous village in the Black River district

. Year of Construction : 1914

Catchment Area : 19.61 km2

Mean Annual Rainfall : 1380 mm

Feeders : (i) Trianon Grosses Roches Feeder Canal. (ii) La Fenêtre Feeder Canal Annual Regulated Yield : 17 Mm3 Reservoir Capacity : 11.52 Mm3 after hydrographic survey of 1996 Dead Storage : 0.2 Mm3 Full Reservoir Level : 146.0 m (amsl)

Type of Dam : Earth cum masonry

Maximum height of dam : (i) above ground level - Earth dam = 8 m = 8.62 m - Earth dam = 10 m = 12.1 m Length of Dam : 1526.54 m

Type of spillway : Ungated masonry with concrete hearting Width of Spillway : 145.26 m

Purpose : Irrigation

 

Midlands dam

Description: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR3HNEOqC4VkkXBy2FCZUxoq6ShBnwmHi7kMud0UhhIdyDpjwKeDescription: https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSUtSaUjs6cKB5MLQr7HDg5NqiTLLYa8q6tqH78m2ULQrKIbZX6Cg 

Location : Year of Construction : December 2002

Catchment Area : 17.2 km2 Mean Annual Rainfall : 4000 mm Feeders :

Regulated Annual Yield : 41 Mm3

Reservoir Capacity : 25.5 Mm3

Full Reservoir Level : 395.00 m (amsl)

Maximum Reservoir Level : 398.24 m (amsl) Dam Crest Level : 399.00 m (amsl)

 Type of Dam : Rockfill with upstream asphalt concrete surface sealing and cutoff wall Maximum height : 19.5 m above ground level 30.0 m above foundation level

Length of Dam : 2449 m including spillway

Type of Spillway : Ungated concrete ogee shaped spillway

Height of Spillway above foundation: 30 m

Purpose : Potable and Irrigation Water Supply History Notes

The Midlands Dam site was chosen at the beginning of the twentieth century to create a reservoir. Works started in 1926 but were stopped in 1931 due to scarcity of funds. Due to an increase in water requirement, the Government commissioned a study in 1991 with a view to finding an optimal solution to meet the water demand of the northern districts of Mauritius. The dam was finally constructed in December 2002 on Grand River South East near Midlands Village.

 

Bagatelle dam

The Bagatelle Dam Project consists of the construction of a reservoir of storage capacity of 14 million cubic metre with an annual yield of 25 Mm3 to mobilize additional water resources and meet the increasing water demand of Port Louis district, the lower parts of the Plaines Wilhems district (Quatre Bornes, Rose Hill, Stanley, Beau Bassin, Coromandel).

 

Construction started in 2012 and was completed in 2017.

 

 Streams – River Terre Rouge and River Cascade

 

Description: Image result for bagatelle dam