Articles | Volume 4, issue 3
Nat. Hazards Earth Syst. Sci., 4, 375–387, 2004
Nat. Hazards Earth Syst. Sci., 4, 375–387, 2004

  28 May 2004

28 May 2004

Establishment of IDF-curves for precipitation in the tropical area of Central Africa - comparison of techniques and results

B. Mohymont1, G. R. Demarée1, and D. N. Faka2 B. Mohymont et al.
  • 1Department of Meteorological Research and Development, Royal Meteorological Institute of Belgium, Ringlaan 3, B–1180 Brussels, Belgium
  • 2National Agency of Météorology and Télédétection by Satellite (METTELSAT), Kinshasa, Congo

Abstract. The establishment of Intensity-Duration-Frequency (IDF) curves for precipitation remains a powerful tool in the risk analysis of natural hazards. Indeed the IDF-curves allow for the estimation of the return period of an observed rainfall event or conversely of the rainfall amount corresponding to a given return period for different aggregation times.

There is a high need for IDF-curves in the tropical region of Central Africa but unfortunately the adequate long-term data sets are frequently not available. The present paper assesses IDF-curves for precipitation for three stations in Central Africa. More physically based models for the IDF-curves are proposed. The methodology used here has been advanced by Koutsoyiannis et al. (1998) and an inter-station and inter-technique comparison is being carried out.

The IDF-curves for tropical Central Africa are an interesting tool to be used in sewer system design to combat the frequently occurring inundations in semi-urbanized and urbanized areas of the Kinshasa megapolis.