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HIDROENERGIA 2008 Bled, 12-13 June 2008

AN INTERDISCIPLINARY APPROACH FOR EVALUATION OF ENVIRONMENTAL FLOW REQUIREMENTS FOR sHPP IN SLOVENIA Nataša SMOLAR-ŽVANUT, PhD Darko BURJA, Bsc Civ Ing ALIDA REJEC, Msc Civ Ing


1. INTRODUCTION 2. EF ASSESSMENT 3. REVIEW OF EF IN SLOVENIA 4. CASE STUDIES 5. CONCLUSIONS


1980 s project 100 new SHPP– financial support from goverment

1995-2006: 1st or 2nd eco-morphological class

• •

• •

WFD 2000 (2000/60/EC): good ecological status / ecological potential EU Directive (2001/77/EC) on promotion of Electricity from Renewable Energy Sources SHPP: 457 SHPP on streams and rivers

Small effect?


1. INTRODUCTION Inadequate water management practices: WATER ABSTRACTION

HYDROLOGY MORPHOLOGY

PHYSICO-CHEMICAL PARAMETERS BIOLOGY RIPARIAN ECOSYSTEM

AQUATIC ECOSYSTEM


Damming

Sediment transfer Flow regime Phy-Chm parameters Water quality Sediment structure River morphology Phytobenthos Macrophytes

Zoobenthos Fish

Environmental problems

Water abstraction


0,015 m3/s

0,776 m3/s

0,235 m3/s

3,25 m3/s


Rapid

Run

Riffle

Glide

Ponded

0,776 m3/s Run

Pool

0,015 m3/s


Comparison in mesohabitats between 2005 and 2006

Average water width /river width (%)

No. of mesohabitats/km Mean water width (m) Q (m3/s)

2005 B1 43 9.20 0,776

B2 81 3.15 0,015

2006 B1 19 9.30 3,250

B2 38 6.40 0,235

B1

100

B2 80 60 40 20 0 2005

2006

Year



The objective environmental flow EF quantity and quality of water ensuring the preservation the aquatic ecosystem: structure and function water body sections of water body  Background: Water Act 2002 

- WFD - WFD and hydromorphological pressures, 2006 - WFD and HPP, 2007 - FAO Fisheries Report No.821 ... - Brisbane declaration, 2007

 The important part of RBMP and main contribution to

river revitalisation


2. EAF ASSESSMENT Process • definition the objectives: status of the river • definition of starting points, instream values, water abstraction scenarios • evaluation of critical parameters

Result Flow regime which has to be ensure at the river section: Morphology, habitats, aquatic and riparian flora and fauna

EF

EF

EF


Methods for EF determination: 1. Hydrological methods look up tables, indices

2. Hydraulic rating methods fieldwork, rapid desk - top analysis, combination hydrology, hydraulics, ecology

3. Habitat simulation relation flow: habitat

4. Holistic methodologies functional analysis, panels of experts


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