Computing Flood Volume of Dikpe Catchment using HEC-HMS

Yaw Danquah Twumasi; Edward Mathew Osei Jnr; Rev. John Ayer

Authors

Yaw Danquah Twumasi
Edward Mathew Osei Jnr
Rev. John Ayer

Keywords:

flood; watershed; rainfall; runoff; HEC-HMS; hydrological modeling

Abstract

Understanding the basic relationships between rainfall and runoff is vital for effective management of flood water. The Lawra District of the Upper West Region, the driest region in Ghana, has experienced periodic and devastating flash floods resulting from high intensity short duration rainfall, a characteristic of semi-arid and arid regions. However all these go waste leading to lack of water during the long dry season. Many methodologies have been applied such as using Digital Elevation Model (DEM) for hydrological modelling and watershed delineation. In this work delineated catchment area computed is used in HEC-HMS for flood volume computation. Annual rainfall for 2009 (a flood year) of 1178.38mm (46.393in) gives a runoff of 1.134m (44.652in) and a volume of 36,065,515.893m3. However a volume of 31,313,221.5m3 was obtained for August, September and October (months with heaviest rainfall) alone. Lumped Hydrological modelling with remote sensing data and GIS techniques for flood volume computation is possible using temperature, rainfall and flow rates values.

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How to Cite

Computing Flood Volume of Dikpe Catchment using HEC-HMS. (2015). Global Journal of Human-Social Science, 15(B2), 9-15. https://socialscienceresearch.org/index.php/GJHSS/article/view/1373

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