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Wiener Wasser [Doku HD] — Transcript

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0:12The city of Vienna lies on the Danube.
0:15That is world-famous. The metropolis
0:19and its citizens consume around 370,000
0:23cubic meters of water daily. For a big
0:26city, that is not unusual. Yet not a
0:30drop of it comes from the Danube. That
0:34is remarkable. Everything drunk and
0:38cooked here, and what flows through
0:40showers, sinks, and fountains into the
0:43sewers and treatment plants, comes from
0:45the Alps. What gives the city its shine
0:50and brilliance is crystal-clear
0:52drinking water. The following story
0:56tells the journey this precious liquid
0:58takes, how it transforms itself and the
1:00city, only to eventually end up in the
1:03river. The story of Vienna water.
1:31Vienna's exclusive water factory lies
1:34in the Alps, or precisely, in the
1:36Eastern Limestone Alps. The
1:41Rax-Schneeberg area and the Hochschwab
1:44are natural water reservoirs from which
1:47water has flowed to Vienna for almost
1:50150 years. When meteorologists '
2:01instruments announce a storm and clouds
2:04tower over the peaks, the cycle that
2:07secures drinking water for Vienna and
2:10its millions of guests begins. Clouds
2:18essentially consist of water. It is
2:21just waiting to be captured by the
2:24mountains and released. The Hochschwab
2:34is the reservoir for the second Vienna
2:36high-spring pipeline. In the spring
3:02area, the municipality of Vienna owns
3:04an area as large as the city itself.
3:07The area is maintained and guarded like
3:10a treasure by the Vienna Waterworks and
3:12the forestry office. It doesn't just
3:20rain here. What comes from the sky is
3:23the water of the Viennese. This
3:26precious liquid will likely be drunk by
3:29citizens not yet born. For the water's
3:32path through the pores, cracks, and
3:35fissures of the limestone is long and
3:37subterranean. During a cloudburst,
3:44however, a large portion of the rain
3:46takes the shortest route to Vienna. For
3:49instance, via the Kläffer Spring in
3:50the Hochschwab area. It swells within
3:52just a few hours. The city takes only a
4:00tiny fraction of these water masses,
4:03and the rest is carried off toward the
4:05sea via the rivers. The spring falls
4:40silent. The water retreats beneath the
4:43forest floor. In the Eastern Alps, rain
4:52is as certain as can be. Even long
4:56periods of drought seem to have hardly
4:58any effect on these massive natural
5:00reservoirs. Beneath the rocks and lush
5:05meadows lies an ocean of drinking water
5:08. Yes. The water reaches the city
6:08without pumps or other technical
6:10gimmicks. It simply flows slowly
6:13downhill. A certain level of discipline
6:17is required. The wild springs are
6:20captured and properly fed into one of
6:22the two Vienna water pipelines. Even
6:27the pristine mountain water is
6:29regularly checked for any pollutants
6:31and other impurities. As here at the
6:36Brunngraben spring, temperature and
6:38conductivity are measured, and the
6:40water is tested for turbidity and
6:42organic contaminants. For quality
6:47control and maintenance, no effort is
6:49too great. If necessary, even tracks
6:52are laid. At the Pfannbauern spring in
6:55the Hochschwab region, inspectors
6:56travel through the tunnels by electric
6:58rail. The Hochschwab, over 2,300 meters
7:19high. It is the largest of Vienna's
7:22natural reservoirs. This mountain
7:24massif feeds the second high-mountain
7:26spring pipeline. No reservoir is more
7:29reliable than 50-million-year-old
7:31mountains made of dolomite and
7:33limestone. As long as the climate
7:38doesn't take an unexpected turn, and as
7:40long as these mountains stand, there
7:42will be water for the capital. The rock
7:50, the soil, and the underground caves
7:53and caverns of the spring area act like
7:56a filter. Vienna's water requires no
7:59additives whatsoever. The springs are
8:58tapped, collected, guided, and
9:01monitored. Now, the stream of drinking
9:05water is ready for its journey to
9:06Vienna. The two water pipelines run in
9:23wide arcs through the eastern Alps. The
9:27first high-mountain pipeline comes from
9:29the south via the thermal line to
9:31Vienna. The second, younger pipeline
9:34comes, as it were, via the western
9:36approach. This is the expressway along
9:41which the water is brought down from
9:42the mountains. In 1864, the city
9:46council decided to build the first
9:48Vienna high-mountain pipeline, which
9:51still covers nearly half of Vienna's
9:53water supply today. Nine years later,
9:57it was opened by Emperor Franz Joseph.
10:03In 1910, the Emperor put the second
10:05pipeline from the Hochschwab into
10:07operation. 10,000 workers were employed
10:16for the project. 100 aqueducts were
10:19constructed. The pipeline is 180 km
10:23long and became a symbol of liberation
10:26from water shortages and such dangers.
10:32The water rushes downhill toward the
10:35capital at a speed of 5 km per hour.
10:52From the spring area to the reservoirs
10:54on the outskirts of the city, the water
10:56travels for about 36 hours in a masonry
10:58, meticulously sealed tunnel. Arrived.
11:05Then the water is ready to be drunk or
11:08used for flushing. From reservoirs like
11:11this one on the Rosenhügel in the 13th
11:13. Vienna municipal district, it is
11:15distributed. What is collected and
11:24distributed here is the basis of life
11:27for the city of Vienna. The water
11:35reservoirs are hermetically sealed off
11:37from the outside world. Air temperature
11:41is a constant 10 ° Celsius. Water
11:45temperature is around 7 ° Celsius. At
11:52night, when the people of Vienna are
11:55asleep and hardly using any water, the
11:58reservoirs fill up. From the reservoirs
12:09, the water is distributed to districts
12:11and individual buildings via a vascular
12:14system of pipes. The network of pipes
12:19is a total of around 3,000 km long.
12:26When Vienna turns on the water at the
12:28start of the day, the Viennese water
12:30reservoirs must show what they are made
12:32of. Austrians, including the Viennese,
12:36are early risers. By 6 o'clock in the
12:39morning, the bathrooms are already
12:40bustling with activity. Today, a
12:58Viennese resident consumes an average
13:00of 130 liters of water per day. That is
13:06about a quarter less than 30 years ago.
13:10The main reasons for this are modern
13:12household appliances, water-saving
13:14toilets, and the fact that the
13:16tightness of the pipe system keeps
13:18improving. Even the water playground on
13:30the Danube Island is fed by the springs
13:32of the Alps. The pipeline runs under
13:35the river and also supplies the
13:37districts beyond the Danube. That is
13:43luxury, but not waste, because the
13:45water flows through the belly of the
13:47city like a regulated mountain stream,
13:50so to speak. Many of the world-famous
14:10cultural monuments would be only half
14:12as beautiful without water and none
14:14would be anywhere near as clean. Spring
14:20water flows and trickles from over
14:221,500 fountains in Vienna. The
14:26monumental fountains splash primarily
14:28for the pleasure of locals and tourists
14:31. No water, no Viennese legends. The
14:35Fiakers at Michaelerplatz are the best
14:37proof of this. In the 18th. Century,
15:03Johann Fischer von Erlach built the
15:05famous St. Charles Church. It is
15:08considered his masterpiece. The water
15:21basin with a sculpture by Henry Moore
15:23was not added until 200 years later in
15:25the 1970s. Viennese water has its own
15:33monument. The Hochstrahlbrunnen
15:40fountain was put into operation on the
15:42occasion of the completion of the first
15:43Vienna mountain spring pipeline on the
15:4424th. Of October 1873. The builder of
15:52the mountain spring pipeline, Anton
15:54Gabrieli, financed the fountain out of
15:56his own pocket. The biggest challenge
16:13for Vienna's water supply is not a
16:16summer drought, but a sports broadcast
16:18on television.
16:22Moraw in midfield, Fahrfah and Altintop
16:25up front. Halil Altintop, the brother
16:27of the Bayern player. And now there is
16:29a free kick for Rapid after the foul.
16:31During breaks and after the end of a
16:33football match, water consumption in
16:35Vienna rises the fastest. One-one is
16:39the half-time score, it will continue
16:41shortly.
16:41When the players go to the locker rooms
16:43, the human urge demands its right.
16:49In water reservoirs located very close
16:51to the consumer network, this can be
16:53clearly seen on the displays.
16:56Consumption quadruples there in a very
16:58short time. It only takes half an hour
17:02for the situation to normalize. By then
17:05, about 17,000 bathtubs full of
17:07drinking water will have been flushed
17:09into the sewer. The drinking water
17:14pipelines are a sensitive matter and
17:16water is an unpredictable entity. The
17:22pipelines work quietly and the
17:24aqueducts stand in the landscape like
17:25structures from a bygone era. But it is
17:29not just water rushing inside.
17:32Craftsmen and experts of all kinds also
17:34occasionally bustle about here. Four
17:49times a year, the water is shut off in
17:51sections. Then teams descend into the
17:55tunnels to inspect them, and if
17:57necessary, to maintain, clean, and
18:00carry out repairs. As a reminder, the
18:06two mountain spring pipelines alone are
18:09330 km long. The inspection, renewal,
18:16and repair of the pipelines is like
18:19work on a motorway. When you finish at
18:22one end, everything begins anew. The
18:34pipelines must be and remain leak-proof
18:37. This alone is a lifelong task for
18:41generations of specialists. Joints are
18:46dried with a flame. Then the hour of
18:50the perfectionists strikes. In the past
18:5520 years, Vienna's total water
18:57consumption has been reduced by 25%.
19:02Lowered. A large part of this is due to
19:09the meticulous sealing work. While
19:28there are aqueducts, the precious
19:30liquid mostly flows hidden from view.
19:34like here, beneath the vineyards south
19:36of Vienna. Only at the access points do
19:48experts notice that Vienna's water is
19:50rushing beneath them. The First Vienna
19:57Mountain Spring Pipeline, model 21st.
19:59Century. This section is made of
20:03stainless steel. Stainless steel
20:06channels occasionally require an
20:08expert's keen eye. No weld in the world
20:12lasts forever, and stainless steel is a
20:15sensitive material. Encounters of the
20:27third kind sometimes occur in the
20:29channels. What looks like a stray moped
20:40is actually a sophisticated sweeping
20:43and cleaning machine tailored for water
20:46pipes. The most elaborate task is
21:13cleaning the large reservoirs. The
21:17Rosenhügel is Vienna's oldest
21:20reservoir and the arrival hall of the
21:22first mountain spring pipeline. The
21:26spring cleaning of this reservoir takes
21:29at least two weeks. Basically, just
21:36like a swimming pool, the water is
21:38drained, the basin is cleaned, and then
21:45refilled. Where drinking water flows,
21:50or where it is temporarily stored,
21:52military-grade care is required. The
21:56walls are cleaned with water and
21:58disinfected with hydrogen peroxide.
22:02Every step of this procedure is
22:04strictly defined and monitored with
22:07eagle eyes, just like in surgery. A few
22:15decades ago, Vienna's city leaders
22:17tapped into an additional water reserve
22:19alongside the two mountain pipelines.
22:23This iron reserve is fed by groundwater
22:26from Moosbrunn and the Donau-Auen
22:28National Park. At certain intervals, it
22:45is necessary to carry out maintenance
22:47work. The specialists employed for this
22:50practice a rare profession. They are
22:54drinking water divers. In the national
23:08park, water is extracted from 14-
23:10meter-deep shafts and pumped into the
23:13pipelines. From the shaft, filter pipes
23:20lead into the gravel bed to tap the
23:22groundwater horizon. A dive just like
23:27in a mountain lake. Maintenance work is
23:32carried out here, and a valve is
23:34prepared for replacement. The water
23:40reserves in the wells are considerable,
23:43but they are rarely used, for example,
23:45when a large reservoir is drained and
23:47cleaned. One of Vienna's biggest water
24:14consumers is a city within a city.
24:19Beneath the striking towers of the
24:22Vienna General Hospital and its
24:24associated buildings, 10,000 people
24:27work, with just as many coming and
24:30going. Safety is paramount, because for
24:39the sick, the seriously injured, the
24:42elderly, newborns, and those recently
24:44operated on, the water must never run
24:47dry. The ritual and vital hand-washing
24:53before surgery is done with standard
24:56drinking water and disinfectant. Before
25:01the water reaches the operating room
25:04pipeline, it has to cover a long
25:06distance. Here, near the Vienna Gürtel
25:10, is where the water enters the AKH.
25:13The water meter fluctuates like a car's
25:15tachometer. As I said, 14,000 bathtubs
25:19are consumed here every day. The term "
25:22pipeline" is an insufficient
25:24description of the system. It is a
25:28kilometer-long labyrinth of pipes that
25:30snakes through the hospital's lower
25:32floors. The already meticulously
25:36monitored Viennese water is tested once
25:38again here. Nowhere is hygiene more
25:44important. The surgical instruments and
25:47cutlery for the entire building are
25:49cleaned centrally. Delivery and removal
25:54via container system. The instruments
25:57come and go in standardized trays, on
26:00which their origin—the respective
26:02operating room—is also noted. Before
26:09sterilization, the instruments are
26:11placed in washing machines. These are
26:14likely the most expensive dishwashers
26:16in the world. There are a total of nine
26:21water reservoirs for drinking water.
26:24Parts of these serve as
26:25fire-extinguishing water, supplying the
26:27sprinkler system and capable of
26:29covering a day's demand in an emergency
26:31. The lifebuoy is mandatory. Of course,
26:35in the hospital city, water is used
26:36just as it is in other cities: for
26:38drinking, brushing teeth, showering,
26:40and washing dishes. But there are
26:44applications where water plays a
26:45medical role, for example, in swimming
26:48pools for movement therapy. The massive
27:00cooling towers give it away. A
27:03considerable portion of the spring
27:04water is used for climate control. A
27:08battery of units generates icy cooling
27:11water or hot steam. This water is also
27:14chemically treated. Germs in the air
27:16conditioning system are among our
27:18greatest enemies. A modern hospital
27:20kitchen. At first glance, one might
27:23think an operation is being prepared
27:25here. But it is actually something
27:27completely different. In the
27:31large-scale kitchen, 7,000 meals are
27:34prepared for lunch alone every day.
27:37Added to that are thousands of
27:38breakfasts and dinners. Cooking is done
27:41here for the staff, patients, students,
27:43and guests of the house. Sometimes you
28:02feel like you've been transported into
28:04a science fiction novel or a space
28:05station. In any case, it couldn't
28:09possibly be any cleaner in the kitchen.
28:26The sewage must, of course, not be
28:28discharged into the canal. According to
28:31EU regulations, the grease is separated
28:33and disposed of as hazardous waste.
28:37Naturally, the dishes are washed, dried
28:39, and sorted once again. However, this
28:43is done fully automatically. The heart
28:55muscle that ensures the water supply
28:58for Vienna, and specifically for the
29:00General Hospital, consists of 30 large
29:03water reservoirs whose contents can
29:05keep the city alive for four days
29:07without replenishment. They are all
29:11located underground. What can be seen
29:16from above are green spaces that have
29:18become an important refuge for nature.
29:22This is the Unterlaa reservoir. Here,
29:26the incoming spring water is stored and
29:28kept fresh through constant flow.
29:37Unterlaa is the largest water reservoir
29:39in Vienna in terms of area. Pumps
29:42transport the water through a ring main
29:45to the reservoirs at Laaerberg and
29:47Rosenhügel. It goes without saying
29:51that the water quality in the Unterlaa
29:53reservoir is also checked regularly. On
30:08behalf of the city, landscape
30:09ecologists have searched for the plants
30:11and animals that live on the grounds of
30:13the Viennese water reservoirs. On the
30:18meadows of the Unterlaa reservoir, they
30:21discovered an inconspicuous rarity. The
30:26small bush-cricket, a highly endangered
30:33species of bush-cricket that likely has
30:35its largest population in all of
30:37Central Europe in the surroundings of
30:39the Viennese reservoirs. The green roof
30:43of the water reservoir and the care
30:45with which it is managed by the city of
30:47Vienna therefore act as a kind of
30:49survival guarantee for the crickets.
30:54Biologists Josef Semrad and Gabor
30:56Wichmann observe a new arrival. The
31:01insects nest in the dense bushes at the
31:03edge of the water reservoir. Red-backed
31:09shrikes are a typical bird species of
31:11particularly open landscapes. The open,
31:14regularly mowed areas of the Unterlaa
31:16reservoir are ideal for them. These
31:21birds primarily hunt large beetles,
31:23bumblebees, bees, hornets, flies, and
31:25grasshoppers. There are around 100
31:29breeding pairs in all of Vienna. A
31:34feast for spider enthusiasts. The wasp
31:38spider has only spread from the south
31:41into Central Europe in the last 50
31:43years, presumably due to global warming
31:46. The wasp spider can also be
31:49recognized by the typical zigzag-shaped
31:51reinforcements in its orb web. By
31:55Austrian standards, this spider is
31:57relatively large. The females reach a
32:00body length of about two and a half
32:03centimeters. The oldest water reservoir
32:10at Rosenhügel impresses in spring with
32:13a rare mass occurrence of the fragrant
32:15orchid, which is safe here from
32:17flower-picking strollers. The same
32:23applies to the yellow kidney vetch, the
32:30white star-of-Bethlehem. And the grape
32:37hyacinths. An unusual insect nests on
32:45the brick facade of the Rosenhügel,
32:50the black mason bee. This bee is
32:55relatively large and builds impressive
32:58brood chambers. The building material
33:02for the brood cells is rock dust or
33:04sand, moistened with saliva and nectar.
33:08They collect the building material near
33:10the nesting site. The Viennese water
33:25reservoirs and their main supply and
33:27discharge lines are guarded as if the
33:29republic's entire gold reserves and the
33:32imperial jewels were stored here. There
33:36are around 20,000 measuring points that
33:38can trigger an alarm. Anyone wanting to
33:48enter the reservoir, and thus
33:50potentially come into close contact
33:52with the drinking water, needs a proper
33:55justification, an individual permit,
33:58special keys, and must know codes. All
34:02gates are electronically secured and
34:05monitored by cameras. If an open door
34:09is signaled, it must be checked
34:11immediately whether this is authorized,
34:13and if staff are currently at work or
34:15not. Is there no explanation? The
34:19police are notified. However, the
34:25Viennese water reservoirs are not just
34:27containers and a valuable natural space
34:29, but also a piece of cultural history.
34:32On the Wienerberg, the tower of the
34:34former water pumping station rises,
34:36visible from afar. The brick facade is
34:39decorated with patterns and ornaments.
34:58At the beginning of the golden era of
35:01Vienna's drinking water supply, the
35:03tower supplied water to the elevated
35:05parts of Favoriten and Meidling. The
35:15water was previously pumped into the
35:17large reservoir with the help of
35:19coal-fired steam engines and fed into
35:22the supply network from there. With the
35:30construction of the second high-spring
35:32water pipeline 100 years ago, the tower
35:34became redundant. Today it serves as a
35:37museum, art gallery, and event venue.
35:40At 67 meters, it is half as high as St.
35:43Stephen's Cathedral. On the other side
36:08of the city and beyond the Danube lies
36:10the Bisamberg. Here one finds the
36:14modern version of a water reservoir,
36:17designed by the Burgenland artist
36:19Gottfried Kumpf. The undulating, curved
36:33facade is accompanied by fish and
36:35mermaids. The lean, rocky soil is an
36:39ideal habitat for sand lizards. They
36:44can be observed here from April to
36:46October. Ground squirrels have similar
36:51preferences to lizards. They prefer dry
36:55, open areas and heathland. Ground
36:59squirrels live in underground burrows.
37:03The males gather a type of harem. Their
37:07settlements resemble a colony. The
37:20reservoir at Bisamberg is more than
37:22just a meeting point for families. It
37:26is one of those reservoirs that supply
37:28the Viennese districts beyond the
37:29Danube with water. Across the Vienna
37:47Woods. The water reservoirs on the
37:51Kahlenberg and Hackenberg are among the
37:53few tanks where the mountain spring
37:55water must be pumped up. In all other
38:00tanks, it flows by itself due to the
38:02difference in elevation. This is also
38:10how the high-altitude Krapfenwaldl pool
38:12is filled. No pool in the city has a
38:15more beautiful view. Scarcely one, a
38:19smaller basin. It is plenty for
38:27children, and for others, it doesn't
38:30matter, because the Krapfenwaldl pool
38:33also gladly serves as a social meeting
38:36place and spot for sunbathers. One
38:42level lower, the atmosphere is clearly
38:44more down-to-earth. The western
38:48reservoirs also supply the Grinzing
38:50wine taverns. In the wine tavern, water
38:53naturally plays a subordinate role. The
38:56folk singer Johann Fürst put this into
38:58words and music 150 years ago. Quiet.
39:13While the wine entertains the people,
39:15other people busy themselves with the
39:17water. Although it is more about
39:20listening, it is still a kind of
39:22dialogue. The waterworks' monitoring
39:26service only starts work when silence
39:28has fallen over the city. At night,
39:32therefore, with little road traffic,
39:35the task is to listen to the rushing of
39:38the tap water to find out if there is a
39:41leak somewhere. With more than 3,000 km
39:45of pipeline network, it is a
39:47never-ending job. Water trying to
39:50escape from the pipe sounds different
39:52than water flowing properly through its
39:54pipe. With a keen ear and plenty of
39:58experience, it is possible to detect
40:00the sounds of defects. Regardless of
40:06what happens to the water that the city
40:09of Vienna brings in from the mountains.
40:11In the end, it lands in the sewer. Half
40:15of the wastewater produced in Vienna
40:17comes from households. The simple user
40:22often disposes of other things along
40:24with it. This causes trouble for the
40:27people at Vienna's wastewater
40:28management. The biggest problems are
40:32caused by cat litter. If you flush cat
40:35litter down the toilet, it solidifies
40:38in the wide main sewers into a
40:40concrete-like substance that must be
40:42painstakingly chiseled away by hand.
40:47That is why the honorable profession of
40:49sewer cleaner has not yet died out. In
40:55Vienna, even the sewers are cleared.
41:00This subterranean labyrinth became a
41:02legend in Orson Welles 'film The Third
41:05Man. The journey of Vienna's drinking
41:20water ends at the city's lowest point
41:22in the main sewage treatment plant,
41:24near the mouth of the Danube Canal. The
41:28place where all the dirt from Vienna
41:30actually flows together is two
41:32foul-smelling concrete basins. That is
41:36where the coarsest of the coarse gets
41:37caught. Around 15 tons of sand and
41:40gravel per week. Then comes the giant
41:45screw. It transports the water to the
41:49next stage, the fine screen. Anything
41:53larger than 6 mm gets caught here. What
41:57causes the biggest problems, an
41:59outsider would never guess. Pantyhose;
42:02they are nearly indestructible. They
42:05stretch, wind, and twist into braids,
42:07bringing all the gears to a standstill.
42:11The volume of water cleaned in the
42:13treatment plant equals the flow of a
42:16medium-sized river. The coarse waste is
42:20disposed of via the streets, so to
42:21speak. That is where one of the most
42:24modern incineration plants in the world
42:26is located. The Viennese waste is
42:29brought to the incineration plant by
42:32truck. There, it dissolves at over 800
42:35degrees Celsius into elaborately
42:36filtered smoke and provides district
42:38heating to the Viennese. Now the
42:40coarsest debris is out. After the
42:43screens, the broth flows through
42:44another settling tank and finally
42:45reaches the open air. Here, the water
42:49flows into the first-stage aeration
42:51tanks, where trillions of bacteria
42:54satisfy their hunger for carbon, thus
42:56devouring a large portion of the
42:58pollutants. The rest is sludge, which
43:01is also disposed of and burned. The
43:06wild churning is created by aerators,
43:09which in turn are powered by massive
43:11units. From here, it continues into the
43:15next settling tank and then to the
43:17second biological purification stage.
43:31The process is called biological
43:33because the enrichment with
43:35microorganisms was copied from nature.
43:37The self-purification of the Danube
43:39water ultimately functions according to
43:41the same principle. A network of
43:44electronic helpers, sensors, and
43:46measuring and warning systems covers
43:49the area. This is where all information
43:53converges. After this exertion, the
43:57water rests once more in the 15
43:58circular final settling tanks. Here,
44:02the activated sludge settles. The
44:07rotating scrapers collect floating
44:09debris and convey the settled sludge
44:11into drainage pipes under the tank.
44:21Here, the water flows crystal clear out
44:23of the final settling tank. At the
44:32treatment plant, the water quality is
44:34checked one last time. Before being
44:55released from the sewage plant, the
44:57water must undergo a final examination.
45:02At the slightest suspicion, the water
45:04must go back to the beginning or at
45:05least back to biological purification.
45:23The effort involved in the cleaning
45:25only becomes clear from a bird's-eye
45:27view. The 15 circular aeration tanks,
45:35the final settling tanks, various
45:38preliminary stages, units, and pump
45:41systems are spread over an area of 40
45:45hectares. 18,000 liters of water can be
45:50cleaned here per second. And so that
45:55the system does not collapse during a
45:57cloudburst, rainwater in the city is
45:59dammed up and held back underground. It
46:06took barely more than 20 hours to bring
46:08the polluted wastewater back into such
46:10a state that it can be absorbed by the
46:13Danube without harm. The fishermen in
46:20their traditional hats, the so-called "
46:23Zille," can safely reel in their catch.
46:27In terms of cleanliness, the treated
46:30wastewater can certainly keep up with
46:32the Danube current. The spring water
46:54that the people of Vienna love to drink
46:56takes an adventurous journey before it
46:59ends up in the Danube. But essentially,
47:02nothing has happened to it. Pure water
47:05has simply become pure water again. The
47:12liquid that once flowed from the
47:13high-mountain pipeline is now just
47:15flushed eastward towards the Black Sea.
47:26Much of this water will evaporate. form
47:30clouds and rain down again. possible
47:35that one day it will end up back in the
47:38ancient reservoirs of the Eastern Alps.
47:41Perhaps, or maybe not for another
47:45million years. on. hey

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