Adaptation to Rainfall Variation Considering Climate Change for the Planning and Design of Urban Stormwater Drainage Networks

Author(s): Mamo, T.

Climate change is a reality that planners and designers of drainage infrastructures must consider. The cumulative effects of gradual changes in hydrology due to climatic change are expected to alter the magnitude and frequency of peak flows over the service life of urban stormwater networks. Potential future changes in rainfall intensity are expected to alter the level of service of urban storm water networks, with increased rainfall intensity likely resulting in more frequent flooding of storm and surcharging of culverts.

The expected effects of climate change necessitate a change in the approach used to plan for and design urban stormwater networks. New development should ideally be served by both a minor storm drainage system, such as a traditional storm drainage system, and a major overland storm drainage system designed to convey the excess runoff when the capacity of the minor system is exceeded.

The planning and design of new urban stormwater networks should incorporate development features and sustainable urban drainage systems that provide multiple benefits such as a reduction of localized urban flooding and harmful environmental impacts, so the future urban stormwater networks design may be subject to a future rainfall regime that differs from current design standards.

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Technical Sessions

Session I Sedimentation
Session II Weather/Climate
Session III Coastal Resources
Session IV Surface Water Management
Session V Wetlands
Session VI Education
Session VII Management/Planning
Session VIII Wetlands
Session IX Delta Groundwater
Session X Nutrients
Session XI Delta Water Resources
Session XII Ports

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