International Journal of
Water Resources and Environmental Engineering

  • Abbreviation: Int. J. Water Res. Environ. Eng.
  • Language: English
  • ISSN: 2141-6613
  • DOI: 10.5897/IJWREE
  • Start Year: 2009
  • Published Articles: 347

Full Length Research Paper

Assessment of the dry and wet period severity with hydrometeorological index

Fatih Keskin1* and Ali Unal Sorman2
  1State Hydraulic Works, Investigation and Planning Department, Inonu cad. No: R-7 Yucetepe/Ankara/Turkey. 2Middle East Technical University, Civil engineering Department, Water Resources Laboratory Ankara/Turkey.
Email: [email protected]

  •  Accepted: 28 December 2009
  •  Published: 31 March 2010



The paper examines the existing condition of water resources for the basin of Çamlidere dam in the vicinity of capital city of Ankara, Turkey and highlights the hydrological elements that are mostly prone to the change of atmospheric conditions. After the evaluation of environmental conditions, the standardized precipitation index (SPI), standardized runoff index (SRI) and standardized potential evapotranspiration index (SEI) have been calculated with monthly air temperature, precipitation and stream runoff records in and around the basin. The calculated index values are used for defining the hydrometeorological dryness and wetness severity in the basin named as Aggregated Drought Index (ADI). The aggregated drought index was able to clarify the long wet and dry periods with a high correlation between the North Atlantic Oscillation (NAO) and El-Nino Southern Oscillations (ENSO) indices. The determined monthly ADI values provide an indication to predict wet or dry conditions in advance for the study basin.


Key words: Drought, wetness, north Atlantic oscillation, southern oscillation, aggregated drought index, camlidere dam, Turkey.

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