1. DROP 2013-06-19
UB 4.5 Brands
WVER service area:
Rur catchment area
Reservoir System
Rurtalsperre
 Obersee (drinking water)
 Rurtalsperre Hauptsee
 Oleftalsperre (drinking water)
 Urfttalsperre

2. DROP 2013-06-19
UB 4.5 Brands
Rurtalsperre: requirements
Hauptsee
Obersee
treatment of stormwater and rainwater
catchment of Obersee
 stormwater overflow: annual discharge rate 15 %
 soil filter retention tank: (98 % hydraul. efficiency)
 rainwater treatment basin (Einruhr)
catchment of Hauptsee
 stormwater overflow: annual discharge rate 25 %
waste water treatment plants:
 reduction of microbes
 reduction of phosphorus
(0,2 mg/l Ptot in the effluent
= monitoring value water authority)

3. DROP 2013-06-19
UB 4.5 Brands
The Obersee
catchment
soil filter retention tank + uv disinfection (Konzen)
measures:
 uv disinfection of effluent from wwtps
 improvement of the Konzen wwtp
(membrane bioreactor)
 building of soil filter retention tanks
 cooperation program with farmers
 installation of sewer system in small
communities
 reduction of incorrect connections to
the sewer and of infiltration water

4. DROP 2013-06-19
UB 4.5 Brands
Rurtalsperre:
Hauptsee
Obersee
measures
 Einruhr wwtp: changing the discharge from
Obersee to Hauptsee
 closing down of two small wwtps
 rain water treatment baisin
 improvement of the Woffelsbach wwtp
(membrane bioreactor, sewer pipe
run along lake bottom collects wastewater
from the former Rurberg wwtp)
 decrease of the storm water overflow rate

5. DROP 2013-06-19
UB 4.5 Brands
Rurtalsperre
water quality
1998
trophic level
1,6 – 2,5
eutrophic 1
3,1 – 3,5
polytrophic
> 3,5
2012
Obersee
2,30
2,13
1,84
1,91
n.b.
Hauptsee
1,93
1,69
1,60
1,40
1,60
2,6 – 3,0
eutrophic 2
2011
0,5 – 1,5
mesotrophic
2004
trophic index
oligotrophic
2000
Methode: nach LAWA (2001)
data: MUNKLV project „Maßnahmen zur Mnimalemission in den Rursee“,
LANUV, WVER

6. DROP 2013-06-19
UB 4.5 Brands
Oleftalsperre
drinking water reservoir
objective:
enlargement of hypolimnion during summer to
 avoid plankton
 avoid manganese
in raw water

7. DROP 2013-06-19
UB 4.5 Brands
Oleftalsperre
drinking water reservoir
temperature
[m above sea level]
raw water
[m. a. s. l.]
430
437,5
445
452,5
temperature [°C]

8. DROP 2013-06-19
UB 4.5 Brands
Oleftalsperre
drinking water reservoir
Oleftalsperre 2011
turbidity
[m above sea level]
raw water
[m. a. s. l.]
430
437,5
445
452,5
turbidity [fnu]

9. DROP 2013-06-19
UB 4.5 Brands
Oleftalsperre
drinking water reservoir
Oleftalsperre 2011
oxygen
[m above sea level]
raw water
[m. a. s. l.]
430
437,5
445
452,5
oxygen content [mg/l]