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Workshop on the Strategy and Action Plan of the WMO Flood Forecasting Initiative Geneva, 8 – 10 December 2009. Flood Forecasting Issues in Ghana by J. Wellens-Mensah hsd@ghana.com. FFI Workshop, Geneva, 8 – 10 December 2009.

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Workshop on the Strategy and Action Plan of the WMO Flood Forecasting InitiativeGeneva, 8 – 10 December 2009

Flood Forecasting Issues in Ghana

by

J. Wellens-Mensah

hsd@ghana.com

ffi workshop geneva 8 10 december 2009
FFI Workshop, Geneva, 8 – 10 December 2009
  • Summary of Main Regional Conclusions for WMO Region I (Africa) contained in Doc.3 are mostly relevant to the Ghanaian Situation
  • Additional Issues specific to Ghana include:
  • Ghana experiences both urban and rural/widespread flooding
  • inadequate infrastructure, instruments and equipment to collect and transmit hydro-met data in real time mode;
  • need for a network of calibrated radars for rainfall prediction and estimation;
ffi workshop geneva 8 10 december 20091
FFI Workshop, Geneva, 8 – 10 December 2009
  • Ghana also experiences flooding from dam spills in upstream country;
  • These spills are beneficial for filling up reservoirs for hydropower generation, but causes severe flooding on way to the reservoirs
  • need to synchronise spilling with conditions in downstream channels
  • need for timely communication of scheduled, controlled and phased spilling from upstream country
ffi workshop geneva 8 10 december 20092
FFI Workshop, Geneva, 8 – 10 December 2009
  • Flood Forecasts must save lives and limit flood damages; therefore forecasts should provide adequate warning and response measures
  • This, among others, requires delineation of flood plains in relation to flood magnitudes;
  • need to combine GIS with DEMs
  • in turn, requires digitised topographic maps at appropriate scale (currently exist in 1:2,500)
  • Need to control development in delineated natural flood plains eg. siting settlements and villages (keeping people and properties away from flood waters)
ffi workshop geneva 8 10 december 20093
FFI Workshop, Geneva, 8 – 10 December 2009
  • Ghana has streamflow forecasting models for inflows for management of hydropower, potable water supply and irrigation reservoirs;
  • There is no comprehensive Flood Forecasting System, except for ad hoc warnings based on levels in rivers;
  • Need to develop end-to-end flood forecasting systems taking advantage of state-of-the art observing systems, data transmission, modelling (eg. using NWP inputs), transmission of flood warnings, scenarios generation and response measures.