Overview Representation Description of Study A rea Process HECHMS Modeling Evaluation Change How to alter current channel Impact How change would effect flooding Decision What solutions are most efficient ID: 1025632
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1. Northern Channel JeddahBy: Julia Cavell, Peter Erni, and Sam Kunz
2. Overview RepresentationDescription of Study AreaProcessHEC-HMS ModelingEvaluationChangeHow to alter current channelImpactHow change would effect floodingDecisionWhat solutions are most efficientFurther Work and Planning
3. RepresentationBase Map for Study Area
4. Map Showing Mountainous Regions Surrounding Jeddah
5. New Channels Implemented by AECOM
6. Description of JeddahJeddah is a arid city with a coastal plainSurrounded by mountainsFlat and steep set of mountains around the cityWhen rainfall occurs it goes down the mountainThen goes through the city
7. Process3.5 Million people 2.1 inches of rainfall annuallyExcept on two days when Jeddah experienced heavy rainfallNovember 26th, 2009 Jeddah was inundated with 4.37 inches of rainThis was approximately 1.46 inches per hour of rainfall
8. Current SituationAECOM built channels to bring flow through the city to Red SeaChannels allow for 500 year floodsThere is still a chance of greater floods due to dam breaches, extreme rainfalls, and climate change
9. Evaluation AECOM’s work does not account for 1000 year flood periodsAccording to HEC-HMS models, the losses and flow calculated were extremely close to recorded data from the region.Due to high level intensity rainfall, the city of Jeddah has periods/days where severe flooding occursMountainous regions around the city contribute to this floodingRainfall from mountains flow directly into citySteep slopes lead to faster flows
10. Data for 100 Year Flood (1.5 in/hr)Peak Discharge of 46.6 m^3/s(Source: Ben Pope)
11. HEC-HMS ModelWadi Bani Malik Basin
12. Known DataOur calculated peak discharge was 186.4 m^3/s for a 24-hour design storm
13. LossesCalculated losses = 37.338 mmThis falls within the range of Total Losses (32.4 - 42.4 mm)
14. Scope of Work and ChangeShow the resulting flow through JeddahReduce flooding of the city during heavy rainfall eventsFocus on two drainage areas: Wadi Bani Malik and Wadi MraikDams within each drainage areaLead to channel which lead to Northern ChannelNorthern Channel leads to Red Sea
15. Solutions & AlternativesWe must account for the additional 9.4 m^3/s peak dischargeDesign new channel that can allow for 1000 year flood dischargeGiven the width of the basin to be 5.3 miles, we propose an increase to 5.7 miles (~30,000 ft) in basin width to reduce
16. Wadi Bani Malik Area DrawingCross Section of Improved Northern Channel
17. ImpactBuilding a bigger channel leads to:Less floodingLess loss of livesSecurity for citizens of JeddahIncrease in tourism of people travelling to MeccaKing Abdullah Aziz:Human life cannot be measured by moneyMust do all we can to limit lives lostBudget not a problem
18. Decision Build a bigger channel that leads to the Red SeaAllow for great flow through the channel Minimize impacts on the cityMinimize loss of life in Jeddah
19. Further plansDesign a channel in AutoCAD that can hold the discharge for a 1000 year flood Research chances of higher precipitation days in JeddahImplement data from Wadi MraikhUnderstand how dams impact basin area and dischargeCost analysis for upgrading the channelShow impact of less flooding on city and tourism