Identification

Title

Long-term groundwater-level anomalies across Sub-Saharan Africa (NERC grant NE/M008932/1)

Abstract

Multi-decadal time series of groundwater levels were compiled by the authors from records of observation wells initiated and maintained by government departments and research institutions in nine countries in sub-Saharan Africa. The pan-African collation of these hydrographs was initiated at the 41st Congress of the International Association of Hydrogeologists (IAH) in Marrakech (Morocco) on 14th September 2014. All records were subjected to a rigorous review by the authors during which the integrity, continuity, duration and interpretability of records were evaluated. This process included dedicated workshops in Benin, Tanzania, and Uganda, and records failing these tests were discarded from the analysis. Procedures included taking of the first time derivative to identify anomalous spikes in records commonly associated with errors of data-entry. Where multiple records in same geographic and climate zone were available (e.g. Benin, South Africa) we prioritized records remote from potential areas of intensive abstraction. Statistical clustering of records was also used in the Limpopo Basin of South Africa to identify the representativity of employed records at Modderfontein and Sterkloop.

Resource type

dataset

Resource locator

https://www.bgs.ac.uk/services/ngdc/accessions/index.html#item127973

function: download

https://www.bgs.ac.uk/services/ngdc/citedData/catalogue/a6d78c2e-3420-4346-9182-4fd437672412.html

function: information

https://www.nature.com/articles/s41586-019-1441-7

function: information

Unique resource identifier

code

http://data.bgs.ac.uk/id/dataHolding/13607465

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

Ground water level

originating controlled vocabulary

title

reference date

date type

revision

effective date

2011

Keyword set

keyword value

NERC_DDC

Geographic location

West bounding longitude

-1.5000

East bounding longitude

35.7400

North bounding latitude

13.5500

South bounding latitude

-24.2900

Extent

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

BEN

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

BENIN [id=630000]

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

BF

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

BFA

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

BJ

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

BURKINA FASO [id=626000]

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

GH

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

GHA

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

GHANA [id=632000]

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

NA

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

NAM

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

NAMIBIA [id=665000]

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

NE

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

NER

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

NIGER [id=627000]

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

SOUTH AFRICA [id=670000]

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

TANZANIA [id=685000]

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

UG

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

UGA

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

UGANDA [id=689000]

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

ZA

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

ZAF

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

ZIMBABWE [id=677000]

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

ZW

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

ZWE

Temporal reference

Temporal extent

Begin position

1955-01-01

End position

2017-12-31

Dataset reference date

date type

creation

effective date

2019-05-21

Frequency of update

notApplicable

Quality and validity

Lineage

Infilling of occasional gaps of less than a week in daily groundwater-level records was achieved by linear interpolation. Because permission to enable access to absolute values of groundwater levels and precipitation at all locations in this dataset has not been granted, both datasets are provided as anomalies with respect to the long-term value for the period of observation.

Conformity

Conformity report

specification

title

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Conformity report

specification

title

reference date

date type

publication

effective date

2010-12-08

degree

false

explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Data format

name of format

Text File

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Responsible organisations

Responsible party

contact position

Department of Geography

organisation name

University College London

full postal address

Gower Street

London

WC1E 6BT

email address

not available

responsible party role

pointOfContact

Responsible party

contact position

Department of Geography

organisation name

University College London

full postal address

Gower Street

London

WC1E 6BT

email address

not available

responsible party role

principalInvestigator

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey

full postal address

Environmental Science Centre,Keyworth

NOTTINGHAM

NG12 5GG

United Kingdom

telephone number

+44 115 936 3100

email address

enquiries@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2022-05-25

Metadata language