Drinking water supply on Langeoog - situation and problems

Drinking water supply on Langeoog-

situation and problems

Holger HinnahOOWV - The water board of

Oldenburg and East Frisia

The OOWV

institution with legal standing

founded in 1948 as a water and soil board

since 1999: new department sewage disposal

OOWV- Area

The OOWV in figuresgeneral company

year of foundation 1948

clients ca. 1 Mill.

employees 651

thereof trainee 30

total assets

(drinking water and sewage) ca. 500 Mill. EUR

Stand:1/2004

2area 7.850 km

sewage disposal since 1999

Fields of activity

drinking water supply

groundwater protection

assumption of further tasks possible

sewage disposal

Department of drinking water waterworks

waterworks

water storage tank

& water storage tanks

Department of drinking waterin figures

members9 rural districts2 cities1 municipality

length of pipe system 13.000 km

accesses to households 320.000

clients 880.000

drinking water release 69 Mill. m / year3

capacity of the 15 waterworks 251.000 m / day3

Stand: 4/2003

consumption per head 121 l / day

An

kau

f &

Au

ffo

rstu

ng

Ko

op

erat

ion

mit

Lan

dw

irte

n

Öko

log

isch

er L

and

bau

purchase of land &

afforestation

cooperation with

farmers

organic farming

Groundwater protection

publicity

pur

chas

e o

f la

nd

& a

ffore

stat

ion

Coo

pera

tion

with

far

mer

s

Org

anic

far

min

g

groundwater protection

Information centres

Old waterworks Langeoog

Kaskade-information centrein Diekmannshausen

Freshwater teaching trail in Nethen

Service centre in the T.A.Z.in Oldenburg

Organic farm „Bakenhus“in Großenkneten

Tree and nature teaching trailin Holdorf

Island Langeoog

An

kau

f &

Au

ffo

rstu

ng

Ko

op

erat

ion

mit

Lan

dw

irte

n

Öko

log

isch

er L

and

bau

Freshwater lens

rainfall

evaporation

North Sea

clay

clay

clay

sand + salt water

freshwater lens

sand +freshwater

wadden sea

well

Water protection area

Main problems

1. unsecure old deposition of harmful substances

Endangering

old domestic garbage dump

well with hydrocarbons

Main problems

1. unsecure old deposition of harmful substances

2. stability of freshwater lens

Chloride concentrationWaterworks Langeoog: chloride concentration

average of all conveying wells in mg/l

0

50

100

150

Jan

90

Jan

91

Jan

92

Jan

93

Jan

94

Jan

95

Jan

96

Jan

97

Jan

98

Jan

99

Jan

00

Jan

01

Jan

02

Jan

03

chlo

rid

e co

nce

ntr

atio

n [

mg

/l]

Main problems

1. unsecure old deposition of harmful substances

2. stability of freshwater lens

3. danger of flooding

Endangered catchment area

catchment area

Endangered catchment area

Questions?

Thank you for your attention!