Flood Risk Management in the People's Republic of China by Yoshiaki Kobayashi John W. Porter

Author:Yoshiaki Kobayashi, John W. Porter [Yoshiaki Kobayashi, John W. Porter]
Language: eng
Format: epub
Tags: Social Science, Disasters & Disaster Relief, Technology & Engineering, Civil, Flood Control
ISBN: 9789290925316
Google: GxI_CQAAQBAJ
Publisher: Asian Development Bank
Published: 2012-04-01T05:38:36+00:00

Box 8 Flood Forecasting with Infrastructure Operations

Flood forecasting can be complicated by the need to consider operations of flood control infrastructure within river basins, such as gated dams used for flood mitigation or controlled diversions to flood detention areas. Both are common in the People’s Republic of China. The problem is alleviated if thorough analysis using standard design floods is conducted in advance of the passage of floods through dams and diversions of floodwaters to flood detention areas. Such analysis should be undertaken at the design stage and then the standard operating procedures can be hard-wired into the forecast methods. However, problems arise because the downstream conditions assumed during design may have changed over time or because the design analysis was not thorough. In any case, during real floods, there may be significant departures from the standard floods used in design and planning. Therefore, it may be desirable to include algorithms in forecasting models that permit the user to test alternative modes of infrastructure operation and provide the flexibility to adapt to evolving flood conditions in real time. In this case, the forecasting tool would also be used as a decision support tool. This can substantially increase the iteration time of forecasts, and becomes most practical in larger river basins with longer warning times.

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