ENVIRONMENT > For experts and partner cities > Water

Surface water

(the text below is based on the chapter Surface water published in yearbook Prague Environment 2006)

The water quality assessment is every year performed according to the Czech Standard ČSN 75 7221 “Classification of Surface Water Quality”. The standard was made more exact on the basis of practical experience and at the same time it was closer harmonised with the surface water classification, which is in use in the EU Member States. The standard is focused on a uniform determination of quality classes of flowing surface water – the classification, which serves for benchmarking of water quality at various locations and in various times. Surface water is classified into five classes based on quality. Water quality is classified on the basis of check results acquired over a longer continuous period. The shortest period assessed is one year. It is recommended, at monitoring frequency of 12 samples taken per a year, to make the classification of the check results for a two-year period in order to have 24 values measured (1999–2000) at least for the characteristic value calculations. If there are less than 11 values – results of water quality checks – the classification pursuant to the standard mentioned cannot be carried out. Water quality is assessed for separately in every single indicator. The assessment indicators evaluated are sorted into five groups. The indicator of the worst quality determines the entire group value. Then the group of the indicators of the worst classification value determines the overall classification of quality of water in a particular watercourse.

Tab. Surface water quality classes according to the TNV 75 7221

Class number Classification

I.

Unpolluted water

II.

Slightly polluted water

III.

Polluted water

IV.

Heavily polluted water

V.

Very heavily polluted water

 

Tab. Groups of surface water quality indicators according to the TNV 75 7221

Group Indicators

A

General physical and chemical indicators

B

Specific organic substances

C

Metals and metalloids

D

Microbiological and biological indicators

E

Radiological indicators

 

Evaluation of hydrometric profiles of the national network located on the City of Prague territory and in its nearest vicinity

In 2005 there were in total 333 hydrometric profiles monitored within the National Monitoring Network of Water Quality in Watercourses.

In Prague and in its closest vicinity there are four hydrometric profiles of the National Network monitored located on the Vltava River – Vrané, Podolí, and Libčice, and one located on the Berounka River – Lahovice. The measurements of selected indicators have been performed continuously since 1963. In 2005 the numbers of substances measured at the profile Vltava River – Vrané were 106, at the profile Vltava River – Libčice 105, at the profile Vltava – Podolí 82, and at the profile Berounka River – Lahovice, 57, respectively. Sampling frequency was twelve times per year and for the indicator AOX six times per year.

According to the Czech Standard ČSN 75 7221 the classification in chlorophyll was the worst evaluated indicator at all the profiles. It reached class V at Berounka River – Lahovice, at Vltava River – Podolí and Vltava River – Libčice class IV. The best evaluation of class III was detected at the Vltava River – Vrané profile. Also total phosphorus fell into class III at all the profiles.

At the Vltava River – Vrané nad Vltavou was the best evaluated profile because more than a half of 38 indicators measured reached merely class I, 11 substances fell into class II, five substances were in class III, and none of the indicators was classified class IV and V.

At the Vltava River – Podolí 20 indicators of 38 measured fell into class I, 14 indicators reached class II, and three indicators attained class III. Besides the aforementioned total phosphorus also BOD5 and CODCr. The only indicator falling into class IV was chlorophyll.

At the Vltava River – Libčice 18 indicators out of 38 were classified class I, 13 substances reached the limit values for class II, five for class III – total phosphorus, AOX, VOC, CODCr, BOD5, chlorophyll and faecal coliform bacteria were classified class IV and no indicator fell in class V.

At the Berounka River – Lahovice similar substances were classified falling inot higher classes as at three profiles at the Vltava River. Besides chlorophyll in class V, these were IM 105 °C, BOD5, TOC, and total iron in class IV, AOX, CODCr, CODMn, total phosphorus, coliform bacteria, and lead falling into class III.

Pursuant to the Order of the Government of the Czech Republic No. 61/2003 Code out of the substances enlisted in the Order the numbers measured at respective profiles were 62 at the profile Vltava – Libčice and the profile Berounka – Lahovice, 60 at the profile Vltava – Vrané and at the profile Vltava – Podolí. While assessing profiles pursuant to the Order at every profile the immission standards for surface water were exceeded at total phosphorus, IM 105 °C, and pH. The highest frequency of exceedance was recorded at the profile Vltava – Libčice, for 10 indicators out of 62 measured, including faecal bacteria and faecal-coliform bacteria. The cleanest profile of the mentioned ones was the profile Vltava – Podolí where solely 6 measured substances did not meet the required immission standards, that is 10 %.

 

Fig. The course of annual values of C95 of some of substances against the limit values set in the Order of the Government of the Czech Republic No. 61/2003, 1995–2005

The course of annual values of C95 of some of substances against the limit values set in the Order of the Government of the Czech Republic No. 61/2003, 1995–2005

Source: ČHMÚ

 

Tab. B2.3 Regularly monitored hydrometric profiles on watercourses

Code River/creek – sampling point Stream km

1044

Vltava River in Vrané nad Vltavou

70,10

1045

Vltava River in Podolí

56,20

1046

Vltava River in Libčice

28,20

1090

Berounka River in Lahovice

0,60

BO01

Botič Stream in Nusle – Sekaninova Str. (limnigraph)

1,50

BO11

Botič Stream downstream Hostivař Dam

BO12

Botič Stream upstream Hostivař Dam

BR00

Branický potok –  inflow into a pipeline (Str. Údolní)

0,46

CI00

Čimický potok – mouth into the Vltava River

0,01

DL01

Dalejský potok – mouth into the Vltava River

0,01

DL11

Dalejský Creek near Klukovice Amphitheatre

DL12

Dalejský potok Řeporyje – Mládkova ul.

DR00

Drahaňský potok – mouth into the Vltava River

0,01

DR02

Drahaňský potok – pod horním rybníkem

CH00

Cholupický potok – křiž. s ul. Komořanskou

0,60

KO00

Komořanský potok – mouth into the Vltava River

0,10

KU00

Kunratický potok –  inflow into a pipeline

0,44

KU02

Kunratický potok Krč (u Zámeckého rybníku)

3,16

KU11

Kunratický potok pod Dolnomlýnským rybníkem

KU12

Kunratický potok pod Šeberákem

LH00

Lhotecký potok – inflow into a pipeline (Str. Čs. exilu)

1,15

LI00

Libušský potok – inflow into a pipeline

1,48

ML00

Mariánskolázeňský potok – mouth into the Vltava River

0,01

MO01

Motolský potok – inflow into a pipeline

4,75

RA01

Radotínský potok – mouth into the Berounka River

0,01

RA02

Radotínský potok – u Rutického mlýna

RO01

Rokytka Voctářova (nám. dr. Holého – limnigraf)

0,27

RO11

Rokytka pod Kyjským rybníkem

RO12

Rokytka před Kyjským rybníkem

RO13

Rokytka pod Počernickým rybníkem

RO14

Rokytka nad Počernickým rybníkem

SP01

Šárecký potok – mouth into the Vltava River

0,01

SP03

Šárecký potok pod Džbánem (Jenerálka)

4,85

SP04

Šárecký potok před Džbánem

10,95

SP07

Šárecký potok Jiviny pod hrází

15,09

SP11

Šárecký potok před Strnadem

ST01

Stodůlecký potok Prokopské údolí

1,28

VR00

Vrutice – mouth into the Vltava River

0,20

ZA00

Zátišský Creek – mouth into the Vltava River

0,10

 Source: ČHMÚ, Lesy hl. m. Prahy, MHMP

 

Fig. Monitored hydrometric profiles of surface watercourses – classes of water quality in the groups of indicators

Monitored hydrometric profiles of surface watercourses – classes of water quality in the groups of indicators

Source: ČHMÚ, Lesy hl. m. Prahy, MHMP

 

Tab. Average values of selected indicators (concentration in mg.l-1), 2001–2005

  Hydrometric profile 2001 2002 2003 2004 2005
BOD

1044

Vltava – Vrané

2,06

1,76

2,14

1,53

1,53

1045

Vltava – Podolí

1,74

2,14

2,53

2,21

2,10

1046

Vltava – Libčice

3,30

2,98

3,05

2,87

2,66

1090

Berounka – Lahovice

3,65

3,15

6,24

4,51

3,49

COD (Cr)

1044

Vltava – Vrané

21,50

22,46

17,29

17,81

18,57

1045

Vltava – Podolí

20,60

23,55

23,10

19,43

19,39

1046

Vltava – Libčice

24,10

23,64

21,83

22,03

20,27

1090

Berounka – Lahovice

20,80

19,18

23,92

20,33

17,19

NO3

1044

Vltava – Vrané

3,23

3,70

2,91

3,09

3,05

1045

Vltava – Podolí

3,17

3,68

2,86

3,10

3,06

1046

Vltava – Libčice

3,62

3,86

3,12

3,24

3,29

1090

Berounka – Lahovice

4,01

4,16

2,64

2,84

3,20

Total phosphorus

1044

Vltava – Vrané

0,16

0,10

0,11

0,10

0,15

1045

Vltava – Podolí

0,18

0,15

0,14

0,13

0,12

1046

Vltava – Libčice

0,24

0,27

0,21

0,19

0,16

1090

Berounka – Lahovice

0,21

0,21

0,16

0,17

0,13

Flow rate [m3.s-1]

1044

Vltava – Vrané

109,60

170,67

109,84

98,25

104,20

1045

Vltava – Podolí

168,00

275,93

175,64

120,64

137,78

1046

Vltava – Libčice

169,60

248,35

177,32

121,80

139,10

1090

Berounka – Lahovice

42,00

67,38

51,16

23,42

29,91

Source: ČHMÚ, MHMP

 

Fig. Average yearly flow rates at selected hydrometric profiles, 1980–2005

Average yearly flow rates at selected hydrometric profiles, 1980–2005

Source: ČHMÚ, MHMP

 

Tab. Classes of water quality of surface watercourses, 2004–2005

Indicator VL
1044
VL
1045
VL
1046
BE
1090
BO
01
DL
01
KU
00
RO
01
SP
01

A – GENERAL, PHISICAL AND CHEMICAL INDICATORS

III.

III.

III.

III.

V.

V.

IV.

IV.

V.

Electrolytic conductivity

I.

I.

II.

II.

IV.

V.

IV.

IV.

IV.

Dissolved matter

I.

I.

II.

II.

0

0

0

0

0

Unsoluble matter

II.

II.

II.

II.

II.

V.

IV.

III.

IV.

Dissolved oxygen

III.

II.

I.

I.

I.

I.

I.

I.

I.

Biochemical oxygen demand

II.

II.

III.

III.

III.

III.

IV.

IV.

III.

Chemical oxygen demand by permanganate

II.

II.

II.

II.

0

0

0

0

0

Chemical oxygen demand by dichromate

II.

II.

III.

III.

III.

III.

III.

IV.

III.

Organic carbon

II.

III.

III.

III.

V.

III.

IV.

IV.

V.

Absorbable organohalogens (AOX)

III.

III.

III.

III.

III.

III.

III.

III.

II.

Ammonia nitrogen

I.

I.

II.

II.

III.

II.

III.

IV.

II.

Nitrate nitrogen

II.

II.

II.

II.

III.

III.

II.

II.

III.

Total phosphorus

III.

III.

III.

III.

III.

IV.

IV.

IV.

IV.

Chlorides

I.

I.

I.

I.

III.

IV.

III.

II.

II.

Sulphates

I.

I.

I.

I.

II.

III.

III.

III.

III.

Calcium

I.

I.

I.

I.

I.

II.

I.

I.

I.

Magnesium

I.

I.

I.

I.

I.

I.

I.

I.

I.

B – SPECIFIC ORGANIC COMPOUNDS

II.

II.

II.

II.

III.

IV.

II.

II.

II.

Dichlorobenzene – mixture of congeners

0

0

0

0

0

0

0

0

0

Chlorobenzene

I.

I.

I.

I.

0

0

0

0

0

1,2-dichloroethane

I.

I.

I.

I.

0

0

0

0

0

Trichloroethene

I.

I.

I.

I.

II.

0

I.

0

0

Tetrachloroethene

I.

I.

II.

I.

I.

0

0

0

0

Chloroform

I.

I.

I.

I.

0

0

II.

0

II.

Tetrachloromethane

I.

I.

I.

I.

0

0

0

0

0

 Lindane

I.

I.

I.

I.

0

0

0

0

0

Sum of PCB congeners

I.

I.

I.

I.

0

IV.

0

0

0

Sum of PAU (6 compounds)

II.

II.

II.

II.

III.

0

0

II.

0

C – METALS AND METALLOIDS

II.

II.

II.

II.

II.

III.

III.

III.

II.

Chromium

I.

I.

I.

I.

0

0

I.

I.

0

Manganese

II.

II.

II.

II.

II.

II.

III.

III.

II.

Iron

I.

II.

I.

II.

I.

II.

III.

II.

II.

Nickel

I.

II.

II.

II.

I.

I.

I.

II.

0

Copper

I.

I.

II.

I.

0

0

0

0

0

Zinc

II.

II.

II.

II.

0

0

0

0

I.

Cadmium

I.

II.

II.

II.

0

III.

0

0

0

Mercury

I.

I.

I.

I.

0

0

0

0

0

Lead

I.

I.

II.

II.

0

0

0

0

0

Arsenic

II.

II.

II.

II.

II.

II.

II.

II.

I.

D – MICROBILOGICAL AND BIOLOGICAL INDICATORS

I.

I.

III.

I.

III.

II.

II.

I.

III.

Faecal coliforms

I.

I.

III.

I.

III.

II.

II.

I.

III.

Enterococci

0

0

0

0

0

0

0

0

0

Index of saprobic benthos

0

0

0

0

0

0

0

0

0

Chlorophyll

0

0

0

0

0

0

0

0

0

Source: ČHMÚ, Lesy hl. m. Prahy, MHMP

 

Tab. A – General physical and chemical indicators, concentrations and effluents, 2005

a) Concentrations

Code Indicator Unit VL1044 VL1045 VL1046 BE1090 BO01 KU02 RO01 SP07

SPV

Electrolytic conductivity

mS.m-1

25,5000

29,6000

32,5000

40,3000

79,0000

89,8000

98,0000

105,0000

RL

Dissolved matter

mg.l-1

188,0000

216,0000

227,0000

276,0000

NRL

Unsoluble matter

mg.l-1

14,8000

18,4000

18,8000

16,9000

24,6000

11,8000

28,7000

22,7000

RO2

Dissolved oxygen

mg.l-1

9,0800

9,8300

11,2000

11,9000

11,4000

9,8000

11,3000

9,7500

BSK

Biochemical oxygen demand

mg.l-1

1,5300

2,1000

2,6600

3,4900

CHM

Chemical oxygen demand by permanganate

mg.l-1

6,6100

6,4100

6,7300

5,8400

CHC

Chemical oxygen demand by dichromate

mg.l-1

18,6000

19,4000

20,3000

17,2000

39,5000

25,4000

27,4000

38,7000

TOC

Organic carbon

mg.l-1

7,7800

8,1600

8,1900

8,8200

34,5000

8,8700

12,2000

16,6000

AOX

Absorbable organic halogens

µg.l-1

18,6000

16,0000

18,6000

17,3000

22,9000

18,0000

17,5000

16,0000

NH4

Ammonia nitrogen

mg.l-1

0,0350

0,0575

0,2720

0,0775

1,0600

0,2900

0,5580

0,6350

NO3

Nitrate nitrogen

mg.l-1

3,0500

3,0600

3,2900

3,2000

3,5600

4,1600

3,6600

1,9200

PCL

Total phosphorus

mg.l-1

0,1450

0,1190

0,1590

0,1340

0,3770

0,1830

0,3210

0,4600

CL

Chlorides

mg.l-1

18,4000

21,4000

24,9000

29,4000

100,0000

99,7000

108,0000

116,0000

SO4

Sulphates

mg.l-1

31,8000

40,2000

42,8000

52,8000

116,0000

156,0000

190,0000

171,0000

CA

Calcium

mg.l-1

26,5000

32,3000

32,8000

40,4000

77,1000

90,2000

98,8000

121,0000

MG

Magnesium

mg.l-1

6,3300

7,8000

8,0400

13,0000

17,6000

24,4000

22,8000

20,0000

Source: ČHMÚ, Lesy hl. m. Prahy, MHMP

b) Effluents

Code Indicator Unit VL1044 VL1045 VL1046 BE1090 BO01 KU02 RO01 SP07

PRT

Flow rate

m3.s-1

104,0000

138,0000

139,0000

29,9000

0,4750

0,1190

0,6330

0,2580

RL

Dissolved matter

t.r-1

632000,0000

931000,0000

982000,0000

258000,0000

NRL

Unsoluble matter

t.r-1

50200,0000

83300,0000

87300,0000

15900,0000

526,0000

51,9000

627,0000

150,0000

RO2

Dissolved oxygen

t.r-1

30600,0000

43600,0000

49700,0000

11300,0000

175,0000

37,2000

225,0000

88,0000

BSK

Biochemical oxygen demand

t.r-1

4820,0000

8770,0000

11000,0000

3000,0000

CHM

Chemical oxygen demand by permanganate

t.r-1

21200,0000

27200,0000

28700,0000

5370,0000

CHC

Chemical oxygen demand by dichromate

t.r-1

59900,0000

81000,0000

85000,0000

15600,0000

756,0000

117,0000

583,0000

289,0000

TOC

Organic carbon

t.r-1

25500,0000

34900,0000

34800,0000

8040,0000

712,0000

36,0000

266,0000

143,0000

AOX

Absorbable organic halogens

kg.r-1

62900,0000

68600,0000

82900,0000

16600,0000

475,0000

102,0000

525,0000

181,0000

NH4

Ammonia nitrogen

t.r-1

136,0000

286,0000

1130,0000

105,0000

23,0000

1,0900

14,7000

5,5300

NO3

Nitrate nitrogen

t.r-1

10400,0000

14200,0000

15400,0000

3470,0000

64,6000

24,5000

82,0000

20,9000

PCL

Total phosphorus

t.r-1

470,0000

509,0000

674,0000

125,0000

7,8300

0,6740

7,0700

3,6500

CL

Chlorides

t.r-1

61800,0000

93200,0000

109000,0000

27000,0000

1570,0000

374,0000

2360,0000

1010,0000

SO4

Sulphates

t.r-1

105000,0000

176000,0000

184000,0000

49600,0000

1760,0000

563,0000

3670,0000

1470,0000

CA

Calcium

t.r-1

87000,0000

141000,0000

142000,0000

36600,0000

1150,0000

311,0000

1910,0000

1030,0000

MG

Magnesium

t.r-1

20800,0000

33800,0000

34600,0000

12200,0000

256,0000

89,7000

438,0000

161,0000

Source: ČHMÚ, Lesy hl. m. Prahy, MHMP

Tab. B – Specific organic substances, concentration and effluents, 2005

a) Concentrations

Code Name Unit VL1044 VL1045 VL1046 BE1090 BO01 KU02 RO01 SP07

CLB_2SUMA

Dichlorobenzenes B19 – mixture

ng.l-1

CLB_MCLB

Chlorobenzene

ng.l-1

0,0000

0,0000

0,0000

0,0000

CLC_12CLE

1,2-dichloroethane

ng.l-1

0,0000

0,0000

0,0000

0,0000

CLC_3CLET

Trichloroethene

ng.l-1

0,0000

0,0000

0,0000

0,0000

1020,0000

0,0000

CLC_4CLET

Tetrachlorethene

ng.l-1

0,0000

10,8000

106,0000

4,1700

108,0000

CLC_CHCL3

Chloroform

ng.l-1

0,0000

0,0000

80,8000

0,0000

0,0000

200,0000

CLC_CHCL4

Tetrachloromethane

ng.l-1

0,0000

0,0000

0,0000

0,0000

PST_LIN

Lindane

ng.l-1

0,0000

0,0000

0,0000

0,1830

PCB_SUMA

Sum of PCB congeners

ng.l-1

PAU_SUMA

Sum of PAH (6 compounds)

ng.l-1

91,9000

35,3000

b) Effluents

Code Name Unit VL1044 VL1045 VL1046 BE1090 BO01 KU02 RO01 SP07

PRT

Flow rate

m3.s-1

104,0000

138,0000

139,0000

29,9000

0,4750

0,1190

0,6330

0,2580

CLB_2SUMA

Dichlorobenzenes B19 – mixture

g.r-1

CLB_MCLB

Chlorobenzene

g.r-1

0,0000

0,0000

0,0000

0,0000

CLC_12CLE

1,2-dichloroethane

g.r-1

0,0000

0,0000

0,0000

0,0000

CLC_3CLET

Trichloroethene

g.r-1

0,0000

0,0000

0,0000

0,0000

24700,0000

0,0000

CLC_4CLET

Tetrachlorethene

g.r-1

0,0000

29200,0000

517000,0000

1610,0000

2630,0000

CLC_CHCL3

Chloroform

g.r-1

0,0000

0,0000

326000,0000

0,0000

0,0000

3570,0000

CLC_CHCL4

Tetrachloromethane

g.r-1

0,0000

0,0000

0,0000

0,0000

PST_LIN

Lindane

g.r-1

0,0000

0,0000

0,0000

219,0000

PCB_SUMA

Sum of PCB congeners

g.r-1

PAU_SUMA

Sum of PAH (6 compounds)

g.r-1

2220,0000

1120,0000

Source: ČHMÚ, MHMP

Tab. C – Metals and metalloids, D – Microbiological and biological indicators, concentrations and effluents, 2005

a) Concentrations

Code Indicator Unit VL1044 VL1045 VL1046 BE1090 BO01 KU02 RO01 SP07

CR

Chromium

µg.l-1

0,5080

0,6830

0,6580

1,3800

0,0000

0,0000

MN

Manganese

mg.l-1

0,0917

0,0858

0,0742

0,0800

0,1020

0,1070

0,2130

0,2630

FE

Iron

mg.l-1

0,2350

0,2920

0,2680

0,4210

0,3080

0,2270

0,5240

0,2970

NI

Nickel

µg.l-1

2,1100

3,2600

2,9300

3,7600

1,3200

0,0000

2,9800

CU

Copper

µg.l-1

2,0800

2,4900

2,8600

3,0300

ZN

Zinc

µg.l-1

15,0000

15,3000

16,3000

9,5800

0,0000

CD

Cadmium

µg.l-1

0,0308

0,0683

0,0567

0,1190

HG

Mercury

µg.l-1

0,0067

0,0000

0,0000

PB

Lead

µg.l-1

2,6300

1,4100

1,8700

2,0100

AS

Arsenic

µg.l-1

2,6800

2,8400

2,5000

2,2900

0,4170

0,0000

1,5700

1,8700

FEK

Faecal coliforms

KTJ.ml-1

5,3300

8,5800

158,0000

17,6000

37,6000

6,1700

20,8000

5,8300

ENT

Enterococci

KTJ.ml-1

ISB

Index of saprobic benthos

CHL

Chrophyll

µg.l-1

b) Effluents

Code Indicator Unit VL1044 VL1045 VL1046 BE1090 BO01 KU02 RO01 SP07

PRT

Flow rate

m3.s-1

104,0000

138,0000

139,0000

29,9000

0,4750

0,1190

0,6330

0,2580

CR

Chromium

kg.r-1

1740,0000

3230,0000

2950,0000

1400,0000

0,0000

0,0000

MN

Manganese

t.r-1

304,0000

387,0000

326,0000

75,7000

1,8700

0,3710

4,6500

1,8200

FE

Iron

t.r-1

872,0000

1410,0000

1310,0000

449,0000

6,3600

0,9660

12,1000

2,0700

NI

Nickel

kg.r-1

7130,0000

15000,0000

12400,0000

3800,0000

31,9000

0,0000

88,8000

CU

Copper

kg.r-1

7030,0000

11200,0000

12800,0000

2810,0000

ZN

Zinc

kg.r-1

53900,0000

78500,0000

71500,0000

11100,0000

0,0000

CD

Cadmium

kg.r-1

98,0000

337,0000

342,0000

127,0000

HG

Mercury

kg.r-1

13,8000

0,0000

0,0000

PB

Lead

kg.r-1

7000,0000

6490,0000

9280,0000

2060,0000

AS

Arsenic

kg.r-1

8450,0000

11300,0000

11300,0000

1910,0000

10,1000

0,0000

60,1000

10,6000

FEK

Faecal coliforms

10^12 j.r-1

24000,0000

35400,0000

707000,0000

19100,0000

616,0000

44,7000

386,0000

61,7000

ENT

Enterococci

10^12 j.r-1

CHL

Chlorophyll

kg.r-1

Source: ČHMÚ, MHMP

Print 27.6.2007 | Jiří Stach | Read: 13100 x
 
 
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