Hydrogeology of Sierra Leone: Difference between revisions

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{| class = "wikitable"
{| class = "wikitable"
|-
|-
|Estimated Population in 2013* || XXX
|Estimated Population in 2013* || 6,092,075
|-
|-
|Rural Population (% of total) (2013)* || XXX%
|Rural Population (% of total) (2013)* || 60.8%
|-
|-
|Total Surface Area* || XXX sq km
|Total Surface Area* || 72,180 sq km
|-
|-
|Agricultural Land (% of total area) (2012)* || XXX%
|Agricultural Land (% of total area) (2012)* || 56.8%
|-
|-
|Capital City || XXX
|Capital City || Freetown
|-
|-
|Region || XXX
|Region || Western Africa
|-
|-
|Border Countries || XXX
|Border Countries || Guinea, Liberia
|-
|-
|Annual Freshwater Withdrawal (2013)* || XXX Million cubic metres
|Annual Freshwater Withdrawal (2013)* || 212.2 Million cubic metres
|-
|-
|Annual Freshwater Withdrawal for Agriculture (2013)* || XXX%
|Annual Freshwater Withdrawal for Agriculture (2013)* || 21.5%
|-
|-
|Annual Freshwater Withdrawal for Domestic Use (2013)* || XXX%
|Annual Freshwater Withdrawal for Domestic Use (2013)* || 52.3%
|-
|-
|Annual Freshwater Withdrawal for Industry (2013)* || XXX%
|Annual Freshwater Withdrawal for Industry (2013)* || 26.2%
|-
|-
|Rural Population with Access to Improved Water Source (2012)* || XXX%
|Rural Population with Access to Improved Water Source (2012)* || 42.4%
|-
|-
|Urban Population with Access to Improved Water Source (2012)* || XXX%
|Urban Population with Access to Improved Water Source (2012)* || 87.1%
|}
|}


Line 88: Line 88:
==Geology==
==Geology==


This section provides a summary of the geology of Sierra Leone. More information is available in the report [http://www.bgs.ac.uk/africagroundwateratlas/fulldetails.cfm?id=AGLA060048 UN] (1988) (see References section, below).
The geology map shows a simplified version of the geology at a national scale. More information is available in the report [http://www.bgs.ac.uk/africagroundwateratlas/fulldetails.cfm?id=AGLA060003 UN (1988)] (see References section, below).


The geology map shows a simplified version of the geology at a national scale (see [[Geology | the Geology resources page]] for more details).
[[File:Sierra Leone_Geology.png | center ]]


[[File:Sierra Leone_Geology.png | right]]


{| class = "wikitable"
|+ Geological Environments
|Key Formations||Period||Lithology||Structure
|-
!colspan="4"|Geological Environment 1
|-
|Name of formation1
||Time period
||Description
||Structure
|-
|
||
||
||
|-
!colspan="4"| Geological Environment 2
|-
|
||
||
||
|-
|
||
||
||
|-
!colspan="4"| Geological Environment 3
|-
|
||
||
||
|-
|
||
||
||
|}


==Hydrogeology==


==Hydrogeology==
The hydrogeology map below shows a simplified version of the type and productivity of the main aquifers at a national scale (see [[Aquifer properties| the Aquifer properties resource page]] for more details).


This section provides a summary of the hydrogeology of the main aquifers in Sierra Leone. More information is available in the report [http://www.bgs.ac.uk/africagroundwateratlas/fulldetails.cfm?id=AGLA060048 UN] (1988) (see References section, below).
More information on the hydrogeology of Burundi is available in the report [http://www.bgs.ac.uk/africagroundwateratlas/fulldetails.cfm?id=AGLA060003 UN (1988)] (see References section, below).


The hydrogeology map shows a simplified version of the type and productivity of the main aquifers at a national scale (see [[Aquifer properties| the Aquifer properties resource page]] for more details).


  [[File:Sierra Leone_Hydrogeology.png]] [[File: Hydrogeology_Key.png | 500x195px]]
  [[File:Sierra Leone_Hydrogeology.png]] [[File: Hydrogeology_Key.png | 500x195px]]




====Unconsolidated====
{| class = "wikitable"
|Named Aquifers||Period||General Description||Water quality
|-
|
||
||
||
|}
==== Sedimentary - Intergranular Flow====
{| class = "wikitable"
|Named Aquifers||Period||General Description||Water quality
|-
|
||
||
||
|}
==== Sedimentary - Intergranular & Fracture Flow====
{| class = "wikitable"
|Named Aquifers||Period||General Description||Water quality
|-
|
||
||
||
|}
==== Sedimentary - Fracture Flow====
{| class = "wikitable"
|Named Aquifers||Period||General Description||Water quality
|-
|
||
||
||
|}
====Basement====
{| class = "wikitable"
|Named Aquifers||Period||General Description||Water quality
|-
|
||
||
||
|}
==Groundwater Status==
===Groundwater quantity===


===Groundwater quality===


==Groundwater use and management==
=== Groundwater use===


==Groundwater management==


=== Groundwater management===
Information on groundwater sources (water points) is collected in certain districts, but there is no central national database. Borehole logs with geological information are not readily available.


===Groundwater monitoring===


=== Transboundary aquifers===
=== Transboundary aquifers===

Revision as of 15:24, 28 September 2015

Africa Groundwater Atlas >> Hydrogeology by country >> Hydrogeology of Sierra Leone

Most of the textual information on this page was taken from the chapter on the Congo in the report ‘Groundwater in North and West Africa’ (UN 1988). This information is outdated. If you have more recent information on the hydrogeology of the Sierra Leone, please get in touch.


Compilers

Dr Kirsty Upton and Brighid Ó Dochartaigh, British Geological Survey, UK

Geographical Setting

Map of Sierra Leone (For more information on the datasets used in the map see the geography resources section)

General

Estimated Population in 2013* 6,092,075
Rural Population (% of total) (2013)* 60.8%
Total Surface Area* 72,180 sq km
Agricultural Land (% of total area) (2012)* 56.8%
Capital City Freetown
Region Western Africa
Border Countries Guinea, Liberia
Annual Freshwater Withdrawal (2013)* 212.2 Million cubic metres
Annual Freshwater Withdrawal for Agriculture (2013)* 21.5%
Annual Freshwater Withdrawal for Domestic Use (2013)* 52.3%
Annual Freshwater Withdrawal for Industry (2013)* 26.2%
Rural Population with Access to Improved Water Source (2012)* 42.4%
Urban Population with Access to Improved Water Source (2012)* 87.1%

* Source: World Bank


Climate

  • Koppen Geiger Climate Zones
    Koppen Geiger Climate Zones
  • Average Annual Precipitation
    Average Annual Precipitation
  • Average Temperature
    Average Temperature


Average monthly precipitation for Sierra Leone showing minimum and maximum (light blue), 25th and 75th percentile (blue), and median (dark blue) rainfall Average monthly temperature for Sierra Leone showing minimum and maximum (orange), 25th and 75th percentile (red), and median (black) temperature Quarterly precipitation over the period 1950-2012 Monthly precipitation (blue) over the period 2000-2012 compared with the long term monthly average (red)

For further detail on the climate datasets used see the climate resources section.

Surface water
Surface Water Map of Sierra Leone (For more information on the datasets used in the map see the surface water resources section)

Soil

Soil Map of Sierra Leone (For map key and more information on the datasets used in the map see the soil resources section)

Land cover

Land Cover Map of Sierra Leone (For map key and more information on the datasets used in the map see the land cover resources section)

Geology

The geology map shows a simplified version of the geology at a national scale. More information is available in the report UN (1988) (see References section, below).


Hydrogeology

The hydrogeology map below shows a simplified version of the type and productivity of the main aquifers at a national scale (see the Aquifer properties resource page for more details).

More information on the hydrogeology of Burundi is available in the report UN (1988) (see References section, below).



Groundwater management

Information on groundwater sources (water points) is collected in certain districts, but there is no central national database. Borehole logs with geological information are not readily available.


Transboundary aquifers

For further information about transboundary aquifers, please see the Transboundary aquifers resources page


References

The following report provides more information on the geology and hydrogeology of Sierra Leone. It, and others, can be accessed through the Africa Groundwater Literature Archive

United Nations. 1988. Groundwater in North and West Africa: Sierra Leone. United Nations Department of Technical Cooperation for Development and Economic Commission for Africa. Department of Technical Cooperation for Development and Economic Commission for Africa, Natural Resources/Water Series No. 18.


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Africa Groundwater Atlas >> Hydrogeology by country >> Hydrogeology of Sierra Leone

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