@article{fdi:010010997,
  title = {{W}ater table fluctuation and recharge in semi-arid climate : some results of the {HAPEX}-{S}ahel hydrodynamic survey ({N}iger)},
  author = {{L}educ, {C}hristian and {B}romley, {J}. and {S}chroeter, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{G}roundwater level measurements taken over a 4-year period from an extensive network of wells and boreholes within the {HAPEX}-{S}ahel ({H}ydrologic {A}tmospheric {P}ilot {E}xperiment in the {S}ahel) degree square (south {N}iger), together with existing data, have provided an insight into infiltration and recharge processes taking place in the porous phreatic aquifer of the {C}ontinental {T}erminal formation. {D}espite high spatial and temporal variability of aquifer response to rainfall (rises of between 0 and 9 m are recorded), a pattern of recharge can be recognised. {A}quifer responses vary from site to site, but the type of response at any single point tends to be consistent from year to year. {R}echarge is dominated by infiltration from temporary drainage networks (pools and streams) and aquifer response depends to a large extent on aquifer hydraulic characteristics and distance from the nearest infiltrating zone. {I}n many wells, for which data extending back to 1987 is available, water levels show a consistent year by year rise. {T}his is interpreted as a process of aquifer recovery following the severe drought of the 1970s and early 1980s, though part may also be attributable to changing patterns of land management (e.g. woodland clearance). {I}nitial estimates of regional recharge are from 50-60 mm/y, or in other words about 10% of annual rainfall. {T}he figure is supported by other methods of investigation (hydrochemical analyses ; water budgets of pools). ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{BILAN} {HYDROLOGIQUE} ; {AQUIFERE} ; {ECOULEMENT} {SOUTERRAIN} ; {INFILTRATION} ; {VARIATION} {SPATIALE} ; {VARIATION} {TEMPORELLE} ; {NIGER} ; {ZONE} {SEMIARIDE}},
  booktitle = {{HAPEX}-{S}ahel},
  journal = {{J}ournal of {H}ydrology},
  volume = {188/189},
  numero = {},
  pages = {123--138},
  ISSN = {0022-1694},
  year = {1997},
  URL = {https://www.documentation.ird.fr/hor/fdi:010010997},
}