Drainage System at King Abdulaziz University (KAU)
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Drainage System at King Abdulaziz University (KAU)
Osama El-Quqa, Luis Galindo, Sarah Seraj
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Flooding at Jeddah and King Abdulaziz University
Nov 25, 2009: 3.5” of rain in 4 hrs. 472 casualtiesJan 26, 2011: 4” of rain in 4 hrs. 160 casualties
Annual Rainfall = 2.1”
Area around university was badly hitNearby highway knocked downAECOM called to emergency action
Scott Edelman FloodList
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Location and Characteristics of KAU
Jeddah
Airport
KAU
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Basic Basemap
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Digital Elevation Model Basemap
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Proposed Project• Design drainage system at KAU
• Reduce probability of flooding
• Assuming one large watershed• Water flows to detention pond at lowest point
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Alternatives
Alternative Distance
A: To Northern Channel 8.7 km
B: To Southern Channel 8.5 km
C: To Red Sea 4.5 km
A
CB
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Time
Inte
nsity
(mm
/hr)
Jeddah Aggregated Rainfall
HEC-HMS Model
• Watershed Parameter Calculations • Area: ~6.138 Km2
• Impervious: 53%• Curve Number: 87• Initial Abstraction: 7.59 mm• Lag Time: 216 min
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HEC-HMS Model
10 year 50 year 100 year 500 year0
1
2
3
4
5
6
7
Precipitation Graph
P (mm) Pe (mm)
Prec
ipita
tion
(in)
0:00 6:00 12:00 18:00 0:000
10
20
30
40
50
Unit Hydrographs
Direct Flow, 10 yearDirect Flow, 50 yearDirect Flow, 100 yearDirect Flow, 500 year
Time (hour)Fl
ow m
3/s
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Detention Pond Design (100 year flood)Calculating storage volume using straight line method • Jeddah Stormwater Design Manual 2011• Surface water flow into Red Sea from West of Jeddah = 4.6m3/s (Subyani 2009)
19:59 23:59 3:59 7:59 11:59 16:00 20:000
5
10
15
20
25
30
Pre-project hydrographStraight line outflow
Time (hrs)
Flow
(m3/
s)
Q=4.6 m3/s
Storage volume reqd = 388,000 m3
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Future Work
• Complete HEC-HMS model
• Full design of detention pond
• Pipe/channel network
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