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Excersise 1:Group A: Albert, Malin, Helena, Oscar

Urban Water system in

Vstra Hamnen, Malm

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Drinking water

The households in Vstra Hamnen, as in all of Malm, get the drinking water from threereservoirs, the lakes Vomb and Bolmen and the groundwaterstreamAlnarpsstrmmen. Themain part (80%) comes from the lake Vomb, 15-20% from the groundwater aquifer in Grevieand 0-5% from the lake Bolmen in Smland (1).

The lake Vomb is situated 40 km northeast of Malm. The water is pumped from the lake intoinfiltration dams. After three months when the water has passed through a 20-25 m thick layerof natural sands the water is pumped from wells to the Vomb water treatment plant where it is

aerated to separate the iron and manganese from the water. After this step a process to reducethe level of CaCO3 takes place. This process gives the water a value of 6dH (avhrdning).Then the suspended solids in the water are reduced with FeCl. Before the water is lead to theMalm distribution net it is disinfected with chloride (2). The treated water from the lake isthen transported to the water control station Bulltofta.

Bulltofta also serves as a water treatment plant, treating water from a groundwater reservoir inGrevie east of Malm. The treatment of this water includes aeration, reduction of CaCO3 anddisinfection with chloride (3). The groundwater reservoir in Grevie is continuously refilledfrom the groundwater streamAlnarpsstrmmen that runs from Abbeks in southeast toBarsebck in northwest (4). When the Grevie water reservoir was detected in 1899, the

water was highly artesian and the wells turned into 10-15 m high fountains. As the outtake

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increased in the following years the artesian power decreased and since 1914 pumps areneeded to carry the water in the 9 km long pipes to Bulltofta (5).

Malm also receives water from the lake Bolmen in Smland. This water is transported in a80 km long tunnel to Perstorp, and then lead through 25 km long pipes to the treatment plant

Ringsjverket where it is treated and distributed to a big part of western Skne (6). In Malmabout 5% of the drinking water comes from Bolmen, but during dry periods in the summer aimportant water source (3).

All drinking water in Malm passes through the Bulltofta control station, from where it ispumped to the distribution net. The drinking water quality is tested 250 times per year atBulltofta and 550 times outside of the treatment plant, to ensure a good quality. The waterquality in Malm is indeed very good, and won in 2005 a price for best drinking water inSkne. The motivation from the jury was A clean water with delightful balance betweenchalk, iron, softness and roughness. Neutral in a nice Skne-style (7). The average citizen inMalm uses 200 litres in a day, to a cost of 0.40 SEK (8).

After passing the Bulltofta control center the drinking water is pressurized by four watertowers in Hyllie, Oxie, Botildenborg and Sdervrn. The water in the towers has atemperature of 8C to keep it fresh (9). The Sdervrn water tower is the oldest of the towersin use, built in 1914 in a jugend style. The reservoir volume of the tower is 2300 m3, theheight of the building is 54 m and the height of the water level is at most 50 m above sea levelHyllie water tower, built in 1973 has a reservoir volume of 10 200 m3 and the water levelreaches 75 m above sea level. Its a popular symbol of Malm (10).

Pic

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Pic

The pressure that the towers give to the water is enough to pump the water about 70 metersabove ground level (11). In Vstra Hamnen the Turning Torso is 190 meters high, and thewater needs to be pumped at this level in the building.

Traces of the drinking water pipes in Vstra Hamnen can be observed as lids on the ground.

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pic x

The pipes leading the drinking water transport to a public toilet can be observed in picture x(jag chansar vilt).

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Pic x

And the water eventually reaches the users, see picture x.

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Pic x

1.http://www.malmo.se/servicemeny/forvaltningarbolag/vaverket/vattenochavlopp.4.33aee30d103b8f15916800018356.html

2. http://www.sydvatten.se/page.php?sid=22

3. http://sydsvenskan.se/malmo/article253706.ece

4. http://www.alnarpsstrommen.nu/

5. Winnfors Erik, Malm: den trstande staden, Sverige 2007

6. http://www.sydvatten.se/page.php?sid=10

7.http://www.malmo.se/miljohalsa/avfallvattenavlopp/vattenochavlopp/vartdricksvatten.4.33aee30d103b8f15916800091163.html

8.

http://www.malmo.se/download/18.15092c0105b77714298000111/dricksvattenversion2.pdf

http://www.sydvatten.se/page.php?sid=22http://sydsvenskan.se/malmo/article253706.ecehttp://www.alnarpsstrommen.nu/http://www.bokus.com/cgi-bin/book_search.cgi?FAST=Winnfors%2C%20Erik&FAST_VALUE=AUTHOR&SORT_ORDER=SO_PRINTYEAR_DESChttp://www.sydvatten.se/page.php?sid=10http://www.malmo.se/miljohalsa/avfallvattenavlopp/vattenochavlopp/vartdricksvatten.4.33aee30d103b8f15916800091163.htmlhttp://www.malmo.se/miljohalsa/avfallvattenavlopp/vattenochavlopp/vartdricksvatten.4.33aee30d103b8f15916800091163.htmlhttp://www.malmo.se/download/18.15092c0105b77714298000111/dricksvattenversion2.pdfhttp://lu.facebook.com/photo.php?pid=284771&id=733226720http://sydsvenskan.se/malmo/article253706.ecehttp://www.alnarpsstrommen.nu/http://www.bokus.com/cgi-bin/book_search.cgi?FAST=Winnfors%2C%20Erik&FAST_VALUE=AUTHOR&SORT_ORDER=SO_PRINTYEAR_DESChttp://www.sydvatten.se/page.php?sid=10http://www.malmo.se/miljohalsa/avfallvattenavlopp/vattenochavlopp/vartdricksvatten.4.33aee30d103b8f15916800091163.htmlhttp://www.malmo.se/miljohalsa/avfallvattenavlopp/vattenochavlopp/vartdricksvatten.4.33aee30d103b8f15916800091163.htmlhttp://www.malmo.se/download/18.15092c0105b77714298000111/dricksvattenversion2.pdfhttp://www.sydvatten.se/page.php?sid=22

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9.http://www.malmo.se/miljohalsa/avfallvattenavlopp/vattenochavlopp/vartdricksvatten/varavattentorn.4.33aee30d103b8f15916800091320.html

10. http://www.eber.se/torn/skaneland/malmo.htm

11. Viveka Lidstrm

http://www.eber.se/torn/skaneland/malmo.htmhttp://www.eber.se/torn/skaneland/malmo.htm