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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Methodology for determining the optimum return period of design for flood
Methodology for determining the optimum return period of design for flood
Author : JUAN PABLO QUIJANO (1), MARIO DIAZGRANADOS (2)
ABSTRACT
Damage and flooding events derive in the need of cost-effective investments for prevention and control. Computer
programs have been turned in useful tools to support decision making. This study proposes a methodology applied in
Bogota River upper watershed to find an optimal return period for design of levees in river banks, using several of these
tools. A register of land uses was made determining urban, agricultural, animal breeding, flower crops, educational and
other zones. At the same time, unit costs, quantities and assets inventory were established for each lot in the study area.
Flood footprints, water height, velocities and levee height for different return periods flows (2, 3, 5, 10, 20, 50, 100, 200,
500 and 1000 years) were determined. Flooded areas were crossed with land use and damage costs were calculated.
Since the construction of any levee does not eliminate completely all the risk of damage, expected cost of damage were
estimated. Based on the levee heights and lengths, construction costs were generated as the sum of workforce, materials
and machinery costs. Finally, total costs were established (expected cost plus levee construction costs for each return
period) whose minimum was the optimal return period for design. This methodology was applied in two scenarios in
Bogota River upper watershed and it resulted in an optimal return period of 150 years for the current scenario and 125 for
the prospective scenario.
File Size : 1,957,079 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 17/08/2015
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