Hydrogeology of Guinea Bissau - Revision history

LaurenGiles: /* References */ rocks for crops link

2023-12-13T09:49:37Z

References: rocks for crops link

← Older revision		Revision as of 10:49, 13 December 2023
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	Travi Y, Fall MD, Fall NKS, Hmeyade BL and Bacar SH. 2017. [https://www.iaea.org/sites/default/files/raf7011_senegalo-mauritanian_basin.pdf Senegalo-Mauritanian Basin: Integrated and Sustainable Management of Shared Aquifer Systems and Basins of the Sahel Region]. Report RAF/7/011. Reproduced by the IAEA, Vienna, Austria, 2017.		Travi Y, Fall MD, Fall NKS, Hmeyade BL and Bacar SH. 2017. [https://www.iaea.org/sites/default/files/raf7011_senegalo-mauritanian_basin.pdf Senegalo-Mauritanian Basin: Integrated and Sustainable Management of Shared Aquifer Systems and Basins of the Sahel Region]. Report RAF/7/011. Reproduced by the IAEA, Vienna, Austria, 2017.

	University of Guelph. [https://www.~~uoguelph~~.ca/~~~geology~~/~~rocks_for_crops/30guinea_bissau.PDF~~ Rocks for Crops].		University of Guelph. [https://www.researchgate.net/publication/315449015_Rocks_for_Crops_Agrominerals_of_sub-Saharan_Africa Rocks for Crops].

	UNICEF. [https://www.unicef.org/guineabissau/water-sanitation-and-hygiene Water, sanitation and hygiene: Guinea Bissau]. Webpage, accessed 10 October 2022		UNICEF. [https://www.unicef.org/guineabissau/water-sanitation-and-hygiene Water, sanitation and hygiene: Guinea Bissau]. Webpage, accessed 10 October 2022

LaurenGiles: /* Groundwater use */ Aquastat link pt.2

2023-12-13T09:47:28Z

Groundwater use: Aquastat link pt.2

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	Groundwater is the main source of rural water supply for drinking water in the dry season. Traditional groundwater abstraction supplies are largely from hand dug wells, water holes in low lying areas (called bolanhas), and artesian springs. Newer abstractions include improved dug wells, often equipped with a rope and bucket system; improved dug and drilled wells equipped with a handpump; and drilled wells equipped with wind or solar pumps (Visscher and van der Werff 1995). More detail on groundwater use practices, in rural and urban areas, can be found in a report by [https://www.ircwash.org/resources/towards-sustainable-water-supply-eight-years-experience-guinea-bissau Visscher and van der Werff (1995)].		Groundwater is the main source of rural water supply for drinking water in the dry season. Traditional groundwater abstraction supplies are largely from hand dug wells, water holes in low lying areas (called bolanhas), and artesian springs. Newer abstractions include improved dug wells, often equipped with a rope and bucket system; improved dug and drilled wells equipped with a handpump; and drilled wells equipped with wind or solar pumps (Visscher and van der Werff 1995). More detail on groundwater use practices, in rural and urban areas, can be found in a report by [https://www.ircwash.org/resources/towards-sustainable-water-supply-eight-years-experience-guinea-bissau Visscher and van der Werff (1995)].

	Groundwater is also used for small scale (garden) irrigation, traditionally via shallow, hand dug wells. Groundwater is not used much for large scale commercial irrigation, although in at least one area - Granja de Pessub - drilled boreholes up to 300 m deep are used for irrigation (https://www.fao.org/aquastat/en/ Aquastat]).		Groundwater is also used for small scale (garden) irrigation, traditionally via shallow, hand dug wells. Groundwater is not used much for large scale commercial irrigation, although in at least one area - Granja de Pessub - drilled boreholes up to 300 m deep are used for irrigation ([https://www.fao.org/aquastat/en/ Aquastat]).

	===Groundwater management===		===Groundwater management===

LaurenGiles: /* Groundwater use and management */ Aquastat link

2023-12-13T09:47:05Z

Groundwater use and management: Aquastat link

← Older revision		Revision as of 10:47, 13 December 2023
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	Groundwater is the main source of rural water supply for drinking water in the dry season. Traditional groundwater abstraction supplies are largely from hand dug wells, water holes in low lying areas (called bolanhas), and artesian springs. Newer abstractions include improved dug wells, often equipped with a rope and bucket system; improved dug and drilled wells equipped with a handpump; and drilled wells equipped with wind or solar pumps (Visscher and van der Werff 1995). More detail on groundwater use practices, in rural and urban areas, can be found in a report by [https://www.ircwash.org/resources/towards-sustainable-water-supply-eight-years-experience-guinea-bissau Visscher and van der Werff (1995)].		Groundwater is the main source of rural water supply for drinking water in the dry season. Traditional groundwater abstraction supplies are largely from hand dug wells, water holes in low lying areas (called bolanhas), and artesian springs. Newer abstractions include improved dug wells, often equipped with a rope and bucket system; improved dug and drilled wells equipped with a handpump; and drilled wells equipped with wind or solar pumps (Visscher and van der Werff 1995). More detail on groundwater use practices, in rural and urban areas, can be found in a report by [https://www.ircwash.org/resources/towards-sustainable-water-supply-eight-years-experience-guinea-bissau Visscher and van der Werff (1995)].

	Groundwater is also used for small scale (garden) irrigation, traditionally via shallow, hand dug wells. Groundwater is not used much for large scale commercial irrigation, although in at least one area - Granja de Pessub - drilled boreholes up to 300 m deep are used for irrigation ([https://www.fao.org~~/nr/water~~/aquastat/~~countries_regions/GNB~~/ Aquastat]).		Groundwater is also used for small scale (garden) irrigation, traditionally via shallow, hand dug wells. Groundwater is not used much for large scale commercial irrigation, although in at least one area - Granja de Pessub - drilled boreholes up to 300 m deep are used for irrigation (https://www.fao.org/aquastat/en/ Aquastat]).

	===Groundwater management===		===Groundwater management===

LaurenGiles: /* Geology */ LNEG link

2023-12-13T09:45:04Z

Geology: LNEG link

← Older revision		Revision as of 10:45, 13 December 2023
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	The geology map below shows a simplified version of the geology of Guinea Bissau at 1:5 million scale (see the [[Geology \| Geology resources page]] for more details).		The geology map below shows a simplified version of the geology of Guinea Bissau at 1:5 million scale (see the [[Geology \| Geology resources page]] for more details).

	A more detailed geology map of Guinea Bissau is available to view and interrogate online at the [https://geoportal.lneg.pt/ '''Visualizador de Mapas geoPortal'''] (published 2014). This map was created by the Uidade de Informacao Geocientifica of the Portugese National Laboratory of Energy and Geology ([https://www.lneg.pt/~~Default.aspx~~ LNEG)].		A more detailed geology map of Guinea Bissau is available to view and interrogate online at the [https://geoportal.lneg.pt/ '''Visualizador de Mapas geoPortal'''] (published 2014). This map was created by the Uidade de Informacao Geocientifica of the Portugese National Laboratory of Energy and Geology ([https://www.lneg.pt/en/homepage/ LNEG)].

	This report provides more information on the Geology of Guinea Bissau: [https://repositorio.lneg.pt/handle/10400.9/1227?locale=en '''Geologia da Guiné-Bissau'''] (Alves 2010).		This report provides more information on the Geology of Guinea Bissau: [https://repositorio.lneg.pt/handle/10400.9/1227?locale=en '''Geologia da Guiné-Bissau'''] (Alves 2010).

LaurenGiles: /* Geology */ Visualizador de Mapas geoPortal link

2023-12-13T09:43:51Z

Geology: Visualizador de Mapas geoPortal link

← Older revision		Revision as of 10:43, 13 December 2023
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	The geology map below shows a simplified version of the geology of Guinea Bissau at 1:5 million scale (see the [[Geology \| Geology resources page]] for more details).		The geology map below shows a simplified version of the geology of Guinea Bissau at 1:5 million scale (see the [[Geology \| Geology resources page]] for more details).

	A more detailed geology map of Guinea Bissau is available to view and interrogate online at the [https://geoportal.lneg.pt/~~geoportal/mapas/index.html?mapa=CartaGuine~~ '''Visualizador de Mapas geoPortal'''] (published 2014). This map was created by the Uidade de Informacao Geocientifica of the Portugese National Laboratory of Energy and Geology ([https://www.lneg.pt/Default.aspx LNEG)].		A more detailed geology map of Guinea Bissau is available to view and interrogate online at the [https://geoportal.lneg.pt/ '''Visualizador de Mapas geoPortal'''] (published 2014). This map was created by the Uidade de Informacao Geocientifica of the Portugese National Laboratory of Energy and Geology ([https://www.lneg.pt/Default.aspx LNEG)].

	This report provides more information on the Geology of Guinea Bissau: [https://repositorio.lneg.pt/handle/10400.9/1227?locale=en '''Geologia da Guiné-Bissau'''] (Alves 2010).		This report provides more information on the Geology of Guinea Bissau: [https://repositorio.lneg.pt/handle/10400.9/1227?locale=en '''Geologia da Guiné-Bissau'''] (Alves 2010).

LaurenGiles: /* Geology */ fixed typo in table 'seend'

2023-11-27T10:46:40Z

Geology: fixed typo in table 'seend'

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	\|\|Shales and sandstones over a large area in the east of the country, forming a northwest/southeast syncline.		\|\|Shales and sandstones over a large area in the east of the country, forming a northwest/southeast syncline.

	At the base of the series are Lower Devonian sandstones, ~~seend~~ in the Cusselinta-Saltinho area. These are mostly well-consolidated micaceous and feldspathic sandstones.		At the base of the series are Lower Devonian sandstones, seen in the Cusselinta-Saltinho area. These are mostly well-consolidated micaceous and feldspathic sandstones.

	Overlying this is the Middle to Upper Devonian Bafata Group, comprising argillaceous schists with intercalactions of fine grained quartz sandstone.		Overlying this is the Middle to Upper Devonian Bafata Group, comprising argillaceous schists with intercalactions of fine grained quartz sandstone.

Beod at 13:57, 20 October 2022

2022-10-20T13:57:27Z

← Older revision		Revision as of 14:57, 20 October 2022
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	[[File:Guinea-Bissau_Geology3.png \| center \| thumb\| 500px \| Geology of Guinea Bissau at 1:5 million scale. ~~Based on~~ map ~~described by~~ Persits et al. 2002~~/Furon and Lombard 1964~~. For more information on the map development and datasets see the [[Geology \| geology resource page]].]]		[https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html '''Download a GIS shapefile of the Guinea Bissau geology and hydrogeology map'''].

			[[File:Guinea-Bissau_Geology3.png \| center \| thumb\| 500px \| Geology of Guinea Bissau at 1:5 million scale. Developed from USGS map (Persits et al. 2002). For more information on the map development and datasets see the [[Geology \| geology resource page]]. [https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html Download a GIS shapefile of the Guinea Bissau geology and hydrogeology map].]]




	'''Summary'''		'''Summary'''
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	The hydrogeology map below shows a simplified version of the type and productivity of the main aquifers at a national scale (see the [[Africa Groundwater Atlas Hydrogeology Maps \| hydrogeology map]] resource page for more details).		The hydrogeology map below shows a simplified version of the type and productivity of the main aquifers at a national scale (see the [[Africa Groundwater Atlas Hydrogeology Maps \| hydrogeology map]] resource page for more details).

			[https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html Download a GIS shapefile of the Guinea Bissau geology and hydrogeology map].


	More information on the hydrogeology of Guinea Bissau is in the report [https://www2.bgs.ac.uk/africaGroundwaterAtlas/atlas.cfc?method=ViewDetails&id=AGLA060039 United Nations (1988)] (see References section, below).		More information on the hydrogeology of Guinea Bissau is in the report [https://www2.bgs.ac.uk/africaGroundwaterAtlas/atlas.cfc?method=ViewDetails&id=AGLA060039 United Nations (1988)] (see References section, below).

	[[File:Guinea-Bissau_Hydrogeology3.png\| center \| thumb\| 500px \| Hydrogeology of Guinea Bissau at 1:5 million scale. For more information on how the map was developed see the [[Africa Groundwater Atlas Hydrogeology Maps \| hydrogeology map]] resource page]]		[[File:Guinea-Bissau_Hydrogeology3.png\| center \| thumb\| 500px \| Hydrogeology of Guinea Bissau at 1:5 million scale. For more information on how the map was developed see the [[Africa Groundwater Atlas Hydrogeology Maps \| hydrogeology map]] resource page. [https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html Download a GIS shapefile of the Guinea Bissau geology and hydrogeology map].]]

	'''Summary'''		'''Summary'''

Beod: /* Groundwater data */

2022-10-11T09:16:42Z

Groundwater data

← Older revision		Revision as of 10:16, 11 October 2022
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	A central groundwater database is held by DGRH (the national water authority). This database integrates groundwater data, including information on borehole drilling logs, groundwater levels and groundwater chemistry, into an existing national waterpoint database. Information from the database, including groundwater levels and quality, can be viewed in an online [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 '''MWater portal''']. The database can be updated by input from smartphones by field operators.		A central groundwater database is held by DGRH (the national water authority). This database integrates groundwater data, including information on borehole drilling logs, groundwater levels and groundwater chemistry, into an existing national waterpoint database. Information from the database, including groundwater levels and quality, can be viewed in an online [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 '''MWater portal''']. The database can be updated by input from smartphones by field operators.

	The groundwater database was supported by UNICEF and University Milano Bicocca during a project in 2018. This project systemised database design and operation and updated it with new information (see more in [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). Field teams ~~of mapping operators~~ from local NGOs ~~were trained to survey and provide~~ data to the database using MWater's field mapping tools; existing groundwater data were also collated from various fragmented sources in DGRH and from drilling companies. ~~It is unclear who has long term responsibility for~~ data collection and database update.		The groundwater database was supported by UNICEF and University Milano Bicocca during a project in 2018. This project systemised database design and operation and updated it with new information (see more in [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). Field survey teams from local NGOs collected new data that was entered into the database using MWater's field mapping tools; existing groundwater data were also collated from various fragmented sources in DGRH and from drilling companies. DGRH staff were trained in data collection, input and analysis to support long term database update and management.

	In 2018, there were 4300 registered boreholes in the database, but some boreholes have more information available than others. For example, only 20% of these had borehole logs available, and those logs that are available are not standardised and not always complete. Work is ongoing to improve the amount and quality of groundwater information in this database, between government agencies, UNICEF, drilling companies and researchers from Milano Bicocca and Padova universities in Italy ( eg [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). A further survey by UNICEF in 2018 of nearly 5250 waterpoints showed that 26% were boreholes equipped with pumps ([https://www.unicef.org/guineabissau/water-sanitation-and-hygiene UNICEF]).		In 2018, there were 4300 registered boreholes in the database, but some boreholes have more information available than others. For example, only 20% of these had borehole logs available, and those logs that are available are not standardised and not always complete. Work is ongoing to improve the amount and quality of groundwater information in this database, between government agencies, UNICEF, drilling companies and researchers from Milano Bicocca and Padova universities in Italy ( eg [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). A further survey by UNICEF in 2018 of nearly 5250 waterpoints showed that 26% were boreholes equipped with pumps ([https://www.unicef.org/guineabissau/water-sanitation-and-hygiene UNICEF]).

Beod: /* Groundwater data */

2022-10-11T09:13:54Z

Groundwater data

← Older revision		Revision as of 10:13, 11 October 2022
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	A central groundwater database is held by DGRH (the national water authority). This database integrates groundwater data, including information on borehole drilling logs, groundwater levels and groundwater chemistry, into an existing national waterpoint database. Information from the database, including groundwater levels and quality, can be viewed in an online [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 '''MWater portal''']. The database can be updated by input from smartphones by field operators.		A central groundwater database is held by DGRH (the national water authority). This database integrates groundwater data, including information on borehole drilling logs, groundwater levels and groundwater chemistry, into an existing national waterpoint database. Information from the database, including groundwater levels and quality, can be viewed in an online [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 '''MWater portal''']. The database can be updated by input from smartphones by field operators.

	The database ~~development~~ was supported by UNICEF and University Milano Bicocca during a project in 2018. This project systemised database design and operation and updated it with new information (see more in [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). Field teams of mapping operators from local NGOs were trained to survey and provide data to the database using MWater's field mapping tools. It is unclear who has long term responsibility for data collection and database update.		The groundwater database was supported by UNICEF and University Milano Bicocca during a project in 2018. This project systemised database design and operation and updated it with new information (see more in [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). Field teams of mapping operators from local NGOs were trained to survey and provide data to the database using MWater's field mapping tools; existing groundwater data were also collated from various fragmented sources in DGRH and from drilling companies. It is unclear who has long term responsibility for data collection and database update.

	In 2018, there were 4300 registered boreholes in the database, but some boreholes have more information available than others. For example, only 20% of these had borehole logs available, and those logs that are available are not standardised and not always complete. Work is ongoing to improve the amount and quality of groundwater information in this database, between government agencies, UNICEF, drilling companies and researchers from Milano Bicocca and Padova universities in Italy ( eg [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). A further survey by UNICEF in 2018 of nearly 5250 waterpoints showed that 26% were boreholes equipped with pumps ([https://www.unicef.org/guineabissau/water-sanitation-and-hygiene UNICEF]).		In 2018, there were 4300 registered boreholes in the database, but some boreholes have more information available than others. For example, only 20% of these had borehole logs available, and those logs that are available are not standardised and not always complete. Work is ongoing to improve the amount and quality of groundwater information in this database, between government agencies, UNICEF, drilling companies and researchers from Milano Bicocca and Padova universities in Italy ( eg [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). A further survey by UNICEF in 2018 of nearly 5250 waterpoints showed that 26% were boreholes equipped with pumps ([https://www.unicef.org/guineabissau/water-sanitation-and-hygiene UNICEF]).

Beod: /* Groundwater data */

2022-10-11T09:10:01Z

Groundwater data

← Older revision		Revision as of 10:10, 11 October 2022
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	====Groundwater data====		====Groundwater data====

	A ~~'''national waterpoint~~ database~~'''~~ is held by DGRH (the national water authority). ~~It includes some~~ groundwater data, including information on borehole drilling logs, groundwater levels and groundwater chemistry. Information from the database, including groundwater levels and quality, can be viewed in an online [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 '''MWater portal'''].		A central groundwater database is held by DGRH (the national water authority). This database integrates groundwater data, including information on borehole drilling logs, groundwater levels and groundwater chemistry, into an existing national waterpoint database. Information from the database, including groundwater levels and quality, can be viewed in an online [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 '''MWater portal''']. The database can be updated by input from smartphones by field operators.

	The database development ~~has been~~ supported by UNICEF~~, including systemising~~ database design and operation and ~~updating~~ it with new information (eg [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). ~~The~~ database ~~can be updated by input from smartphones~~. In 2018, there were 4300 registered boreholes in the database, but some boreholes have more information available than others. For example, only 20% of these had borehole logs available, and those logs that are available are not standardised and not always complete. Work is ongoing to improve the amount and quality of groundwater information in this database, between government agencies, UNICEF, drilling companies and researchers from Milano Bicocca and Padova universities in Italy ( eg [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). A further survey by UNICEF in 2018 of nearly 5250 waterpoints showed that 26% were boreholes equipped with pumps ([https://www.unicef.org/guineabissau/water-sanitation-and-hygiene UNICEF]).		The database development was supported by UNICEF and University Milano Bicocca during a project in 2018. This project systemised database design and operation and updated it with new information (see more in [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). Field teams of mapping operators from local NGOs were trained to survey and provide data to the database using MWater's field mapping tools. It is unclear who has long term responsibility for data collection and database update.

			In 2018, there were 4300 registered boreholes in the database, but some boreholes have more information available than others. For example, only 20% of these had borehole logs available, and those logs that are available are not standardised and not always complete. Work is ongoing to improve the amount and quality of groundwater information in this database, between government agencies, UNICEF, drilling companies and researchers from Milano Bicocca and Padova universities in Italy ( eg [https://www.researchgate.net/publication/327917281_GROUNDWATER_DATABASE_FOR_SUSTAINABLE_WATER_DEVELOPMENT_IN_GUINEA_BISSAU Fussi et al. 2018]). A further survey by UNICEF in 2018 of nearly 5250 waterpoints showed that 26% were boreholes equipped with pumps ([https://www.unicef.org/guineabissau/water-sanitation-and-hygiene UNICEF]).

	[[File:GB-BhPortal.png \| center \| thumb\| 500px \| [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 MWater portal] showing outputs from groundwater borehole database for Guinea Bissau.]]		[[File:GB-BhPortal.png \| center \| thumb\| 500px \| [https://portal.mwater.co/#/dashboards/9c20165c8763489b85baf898bda1dca3?share=2bb0050028d540298277e50208717545 MWater portal] showing outputs from groundwater borehole database for Guinea Bissau.]]