Water quality above and below pollution sources under low flow situations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00020699%3A_____%2F23%3AN0000178" target="_blank" >RIV/00020699:_____/23:N0000178 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Water quality above and below pollution sources under low flow situations

Popis výsledku v původním jazyce

The identification of river profiles suitable for assessing the effect of drought on water quality includes the entire Czech Republic, however, 46 sources of mainly municipal pollution within the Elbe basin were selected for this contribution. For selected discharge sources, there are situated water quality monitoring sites above and below the wastewater discharge. The share of wastewater discharged from individual selected sources in the flow of watercourses (recipients of wastewater) ranged in the dry period between 1 and 83%. No significant dependence between the size of the discharge source (expressed by both the number of connected inhabitants and the amount of discharged wastewater) and the share of wastewater in the flows in the streams was found. The exception was the largest assessed source, which also had the highest share of discharged wastewater in the stream. This relationship is significantly influenced by the size of the stream into which the wastewater is discharged.To illustrate the water quality situation above and below the discharge sources, the total phosphorus parameter was chosen as the average of the values measured in the summer months. The time period was chosen from 1990, since no measurements are available above discharge sources before that year. Several insights emerge from the graph. Up to about 2004, the concentration ranges are larger than in the later period,but in the later period the occurrence of outliers increased (these situations are often associated with rainfall-runoff events). The situation below the discharge sources is almost always significantly worse than above the sources, although it is not optimal even there (these profiles can be located below other discharge sources). For comparison – the limit for permissible surface water pollution for total phosphorus in Government Regulation No. 401/2015 Coll. is 0.15 mg/l (annual average), and a concentration between 0.03 and 0.07 mg/l (median) is determined for good ecological status of water bodies. For the period from 2006, it is shown that even though the median concentration of total phosphorus above the discharge sources varies in similar values, the situation below the discharge sources differs significantly in individual years. The situation is significantly worse in years 2007 and 2008, 2015, 2017 and 2018, 2022 (median of concentrations above 0.25mg/l).

Název v anglickém jazyce

Water quality above and below pollution sources under low flow situations

Popis výsledku anglicky

The identification of river profiles suitable for assessing the effect of drought on water quality includes the entire Czech Republic, however, 46 sources of mainly municipal pollution within the Elbe basin were selected for this contribution. For selected discharge sources, there are situated water quality monitoring sites above and below the wastewater discharge. The share of wastewater discharged from individual selected sources in the flow of watercourses (recipients of wastewater) ranged in the dry period between 1 and 83%. No significant dependence between the size of the discharge source (expressed by both the number of connected inhabitants and the amount of discharged wastewater) and the share of wastewater in the flows in the streams was found. The exception was the largest assessed source, which also had the highest share of discharged wastewater in the stream. This relationship is significantly influenced by the size of the stream into which the wastewater is discharged.To illustrate the water quality situation above and below the discharge sources, the total phosphorus parameter was chosen as the average of the values measured in the summer months. The time period was chosen from 1990, since no measurements are available above discharge sources before that year. Several insights emerge from the graph. Up to about 2004, the concentration ranges are larger than in the later period,but in the later period the occurrence of outliers increased (these situations are often associated with rainfall-runoff events). The situation below the discharge sources is almost always significantly worse than above the sources, although it is not optimal even there (these profiles can be located below other discharge sources). For comparison – the limit for permissible surface water pollution for total phosphorus in Government Regulation No. 401/2015 Coll. is 0.15 mg/l (annual average), and a concentration between 0.03 and 0.07 mg/l (median) is determined for good ecological status of water bodies. For the period from 2006, it is shown that even though the median concentration of total phosphorus above the discharge sources varies in similar values, the situation below the discharge sources differs significantly in individual years. The situation is significantly worse in years 2007 and 2008, 2015, 2017 and 2018, 2022 (median of concentrations above 0.25mg/l).

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10503 - Water resources

Projekt

<a href="/cs/project/SS02030040" target="_blank" >SS02030040: Predikce, hodnocení a výzkum citlivosti vybraných systémů, vlivu sucha a změny klimatu v Česku</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Magdeburský seminář o ochraně vod 2023

ISBN

978-80-11-03292-0

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

119-120

Název nakladatele

Povodí Ohře, státní podnik

Místo vydání

Chomutov

Místo konání akce

Karlovy Vary

Datum konání akce

11. 10. 2023

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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