EnvironmentalEngineeringI:Hydrology

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2Hydrologic Cycle

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Flooding 4

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Beijing,China– July2012

http://www.youtube.com/watch?v=y_JyC8oDtgc

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MississippiRiver– May2011

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8

Erosion 9

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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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Hydrographs

Describeflowpatternoverasettimeperiod,andidentifyQp

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IdealizedHydrographforRationalMethod

MoreFlow

Volume

Lessflow

0 time 24

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BBCWebsite

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RationalMethod

• 𝑸𝒑 = 𝑪𝒊𝑨

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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