BERGISCHE UNIVERSITÄT WUPPERTAL

Questionnaire Campaign Floods and Flash Floods Analysis of public survey, only Dortmund

Research Study

by Dr.-Ing. Mario Oertel

March 2009

Hydraulic Engineering Section Civil Engineering Department University of Wuppertal Pauluskirchstr. 7 42285 Wuppertal e-Mail: [email protected] Web: www.bauing.uni-wuppertal.de/hydro Fon: +49 202 439 4133 Fax: +49 202 439 4196 2 Contents

Contents

1 Statistics 3

2 Quantity 4

3 Block I – General questions to habitation 4

4 Block II – Questions to natural phenomena 6

5 Block III – Questions to floods and flash floods 8

6 Block IV – Questions to questionnaire campaigns 12

7 Block V – Personal questions 13 1 Statistics 3

1 Statistics

Date and time of questionnaire campaign Wuppertal: 17.03.2009, 09:00 to 14:00 Uhr Dortmund: 18.03.2009, 09:00 to 13:30 Uhr Cologne: 19.03.2009, 09:00 to 13:00 Uhr D¨usseldorf: 19.03.2009, 13:30 to 16:30 Uhr

Place of questionnaire campaign Wuppertal: Inner city Elberfeld, inner city Barmen Dortmund: Inner city Platz von Netanya Cologne: Inner city Schildergasse D¨usseldorf: Inner city Heinrich-Heine-Allee

Quantity of feedbacks All: 339 Wuppertal: 135 Dortmund: 60 Cologne: 72 D¨usseldorf: 72 4 2 Quantity

2 Quantity

Quantity of questionnaire campaign feedbacks: 60

100% Dortmund

3 Block I – General questions to habitation

Distance of habitation to place of questionnaire campaign (km) < 1% 7% 3%

32% 13%

45% < 5 5−20 21−50 51−100 > 100 no answer 3 Block I – General questions to habitation 5

Habitation character < 1% Residential area < 1% 10%

28% 37% 37%

5% 3%

17% 62% single−familiy house with basement single−familiy house without basement inner city multi−family house, basement outside multi−family house, ground floor rural multi−family house, upper floor no answer no answer

Living time at habitation (years) River or stream around? 2% < 1% 13% 10%

45%

40%

90% < 1 1−5 yes > 5 no no answer no answer 6 4 Block II – Questions to natural phenomena

4 Block II – Questions to natural phenomena

Interest in natural phenomena? 2%

17%

82%

yes no no answer

Already water in basement/ground floor? Resulting protective measures? < 1% 13%

25%

33%

< 1%

75%

53%

yes, by heavy rainfall yes, by river flood yes no no no answer no answer 4 Block II – Questions to natural phenomena 7

Former damage amount (EUR) Was the former damage insured?

20% 25% 27%

44%

25%

6% 53% < 1.000 yes 1.000−10.000 no > 10.000 no answer no answer

Could basement/ground floor be affected? Do you know affected relatives/neighbours?

8% 7%

48% 52% 42% 43%

yes yes no no no answer no answer 8 5 Block III – Questions to floods and flash floods

5 Block III – Questions to floods and flash floods

Do you know the term "flood"? Do you know the term "flash flood"? < 1% < 1%

35%

65%

100% yes yes no no no answer no answer

What do you figure out by the term "flash flood"?

What do you figure out by the term "flood"? 10% < 1%2% 3%

7%

42%

57%

80%

extreme water level in a river flooding due to heavy rainfall flooded area close to a river flooding due to overloaded sewage system other other no answer no answer 5 Block III – Questions to floods and flash floods 9

Term−understanding after staff discussion? << 1%1%

100% yes, familar with terms yes, but not familar with terms before no no answer

Information source "flood" < 1% Information source "flash flood" 16% < 1% 9% < 1% 33% << 1%1%

39%

28%

29%

20% 23% TV, news TV, news TV, documentation TV, documentation newspaper, magazine newspaper, magazine informative meeting informative meeting flyer flyer friends friends no answer no answer 10 5 Block III – Questions to floods and flash floods

Participation informative meeting "flood"? Participation informative meeting "flash flood"? 2% 2% 3% 10%

20%

25%

70%

68%

yes yes no, but I know about existent meetings no, but I know about existent meetings no, and I didn't know about existent meetings no, and I didn't know about existent meetings no answer no answer

Can a "flood" affect you?

10% 5% Can a "flash flood" affect you?

13% 18%

17%

15% 27% 50%

18%

27% yes, already been affected yes, already been affected yes, definitely yes, definitely yes, imaginable yes, imaginable no, unlikely no, unlikely no answer no answer 5 Block III – Questions to floods and flash floods 11

Would you insure yourself against "flood"? Would you insure yourself against "flash flood"?

7% 3% 7% 10%

45% 37% 45% 47%

yes, for damage > 10.000 EUR yes, for damage > 10.000 EUR yes, generally yes, generally no no no answer no answer 12 6 Block IV – Questions to questionnaire campaigns

6 Block IV – Questions to questionnaire campaigns

Desire for more informative meetings? 3% 12% Is this the right place for this questionnaire campaign? 2%2%3% 27% 13% 10%

8%

37%

22% 62%

yes, it's a flood plain yes, practicable everywhere yes, affected yes, other yes, interest no, it's no flood plain no, not affected no, not required no, no interest no, other no answer no answer 7 Block V – Personal questions 13

7 Block V – Personal questions

Persons in household < 1% Gender 18% < 1%

47% 55% 53% 27%

1 male 2 female > 2 no answer no answer

Age (years) 5%< 1% 17% Club member 2%

28%

13% 38%

27% 70% < 16 16−25 26−40 41−55 yes > 55 no no answer no answer 14 7 Block V – Personal questions

Do you read local news of your daily newspaper? < 1%

27%

73%

yes no no answer