WATER BALANCE OF SLOVENIA 1971 2000

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WATER BALANCE OF SLOVENIA 1971 2000
Peter Frantar mag. Marjan Bat Mojca Dolinar Bla
Kurnik Environmental Agency of the Republic of
Slovenia Ljubljana, Slovenia
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INTRO

• WHY WATER BALANCE 1971 2000 ???
• CLIMATE CHANGES
• MORE ACCURATE DATA (as 61-90)
• USE OF GIS TOOLS
• BASE FOR YEARLY WB
• UNDERSTANDING OF PROCESSES ...

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GEO LOCATION POSITION
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GEOGRAPHICAL VARIETY
PANONIAN
ALPS
KARST, DINARIC
ADRIATIC
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MAJOR WATERSHEDS
MURA
DRAVA
SAVA
SOCA
REST ADRIA
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WATER BALANCE 71-00
INPUT OUTPUT 0 BASIC EQUATION P E Q
dS USED EQUATION P E Q PREPOSITON The
water withdrawals and the storage changes can be
neglected due to long term period and small
amounts compared to overall water quantities.
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CLIMATE MONITORING (RR, ETP)
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PRECIPITATION

• CORRECTED PRECIPITATION FOR DIFFERENT SLOVENIAN
  GEOREGIONS
• DATA ALSO FROM NEIGHBOUR STATES

Relative frequency distribution of precipitation
measuring sites and DEM according to altitude
classes
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PRECIPITATION 1971 - 2000
800 mm
3500 mm
1300 mm
2700 mm
1000 mm
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EVAPOTRANSPIRATION

• ONLY FEW DIRECT MEASUREMENTS
• CALCULATED VALUES

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EVAPOTRANSPIRATION 71-00
750 mm
lt 500 mm
gt 800 mm
gt 800 mm
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RUNOFF

• runoff data is considered the most reliable and
  accurate data
• procedure selection of water gauging stations
  (monthly average discharge), correlations of
  missing values,...
• selection of hydrometrical units
• calculation of specific discharge

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HYDROLOGICAL MONITORING
ALL STATIONS - gt 700
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HYDROLOGICAL MONITORING
WORKING STATIONS cca. 200
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HYDROMETRICAL UNITS
SELECTION
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SPECIFIC RUNOFF
lt 10 lt/s
gt 60 lt/s
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WATER BALANCECONCLUSIONS

• IMPORTANT INTERDEPENDENCE OF ALL MAJOR WB
  ELEMENTS
• PRECIPITATION
• EVAPORATION
• RUNOFF

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WHATS NEXT...

• COMPARISON OF ALL ELEMENTS
• DEFINITIONS OF ERRORS AND CORRECTIONS
• DETAILED STUDIES
• PUBLICATION
• YEARLY WATER BALANCE CALCULATIONS

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... MORE INFO IN THE ARTICLE and on
internet www.arso.sigov.si THANK YOU