EnvironmentalEngineeringI:Hydrology
1
2Hydrologic Cycle
3
Flooding 4
5
Beijing,China– July2012
http://www.youtube.com/watch?v=y_JyC8oDtgc
6
MississippiRiver– May2011
7
8
Erosion 9
10
11
Pollution 12
Precipitation
Watershed
StormwaterSystem
Detention Ponds
Creeks, Rivers, Lakes
These two determine demand on the stormwater system.
The capacity of these two must be adequate for the demand and to manage peak flow going to creeks, rivers, and lakes.
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WatershedsDefinition: Areaoflandthatdrains
watertoacommonpoint
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15
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Hydrographs
Describeflowpatternoverasettimeperiod,andidentifyQp
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IdealizedHydrographforRationalMethod
MoreFlow
Volume
Lessflow
0 time 24
18
BBCWebsite
19
20
RationalMethod
• 𝑸𝒑 = 𝑪𝒊𝑨
21
2
5
10
25
50
100
20.0
19.0
10.0
8.0
6.0
4.0
2.0
1.0
0.8
0.6
0.4
0.2
0.1
0.08
0.06
0.04
0.02
Rai
nfal
l Int
ensi
ty [i
nch/
hr]
Madison, WI1905-1951
5 10 15 20 30 40 50 60 2 3 4 5 6 8 10 12 18 24
minutes hoursStorm Duration
Recurrence Interval [years]
24
http://www.tcpalm.com/news/2008/jun/01/travel-411-new-jewfish-creek-
bridge-opens/
SystemsSnapshot
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