The Journey Water Takes To Get To Your Home | How Cities Work | Spark

this time we reveal the relentless struggle to keep water flow into our cities one of these pumps can fill up an Olympic sized swimming pool in 20 seconds the hidden army working to keep our water safe with less than 15 minutes lifespan once you entered into this water and the future of our water waste people flush the toilet and turns into fuel poor Parsa bus after world's population live in urban areas and the number is rising every second each day is a race against time water and moves more than 3.5 billion people it's an impossible daily challenge the slightest glitch can bring a city to its knees and every 24 hours it has to be done all over again this is the story of how city's world [Music] for centuries cities have been built near a freshwater supply without it we'd be lucky to live three days but this most basic human need can be deadly to get the supply wrong and it can poison us get too close and it can drown us water we need it and must respect it with every passing year the challenge of providing water to billions of people becomes harder and harder nowhere is this more apparent than the city of Los Angeles this is the key to LA survival the Hoover Dam on the mighty Colorado River it is a whole state away but the reservoir it controls Lake Mead is a critical supplier of drinking water to the city the route to LA runs 250 kilometers downstream to the Colorado River aqueduct greg hare is one of the pilots charged by the authorities in southern california with keeping this precious structure safe when I'm doing security patrols I'm mainly looking for people who aren't supposed to be there if I see something that I believe is suspicious I will call our dispatch office and have them take the appropriate action [Music] [Applause] this man-made aqueduct provides Los Angeles in Southern California with approximately 4 billion litres of water a day because of its importance to the state surveillance was heightened after the 9/11 attacks our special security patrols are tight or whatever the terrorist alert level is but it's a huge challenge the Colorado River aqueduct is a 389 kilometre network of tunnels canals and pumping plants its sheer size makes it virtually impossible to protect efficiently from the ground the reason we do that is because we can cover the entire length of the aqueduct but Greg's aerial patrol allows them to police the remotest points of the aqueducts route where few ground patrols are able to reach around to watch it you could have something going on out there that you wouldn't know about unless you could fly it there and take a look at it real quick people aren't the only threat Greg and his team run constant checks to scan the waterway for signs of damage the aqueduct must carry the city's water across no less than three hostile mountain ranges in the 70 years since it was built the population of California has risen by more than 500 percent the aqueduct is a backbone of our water supply system it's been the most reliable delivery of water for the last 70 years for Southern California the challenge was to get water from the Colorado River some 242 miles into Southern California over several mountain ranges and a very dry Don Nash oversees all five pumping stations along the aqueduct including the Julian Heinen's plant we're at Heinz pub plant this is the last lift on the Colorado River aqueduct it's taken about 25 hours for the water to get here from the Colorado River this station is the last and most powerful of the pumping stations each day it must defy gravity to lift over four million tonnes of water over 130 meters to the top of Eagle Mountain and this is the last 441 feet it takes to overcome the last mountain range to get us into Southern California the power needed to lift the water is staggering this one pump of nine that we have here one of these pumps can fill up an Olympic sized swimming pool in 20 seconds it's actually discharging right here underneath our feet and going up the hill from 441 feet to the top of the hill don't 9 12,500 horsepower pumps lift water over the mountains but there's another natural threat waiting just on the other side this is Lake Matthews the final reservoir on the Colorado River aqueduct where the city's water is stored before flowing into LA for treatment storing vast quantities of water in the middle of the desert produces unexpected challenges the lake is a breeding ground for tiny intruders the Vantage of having water in a lake is that you can store it the disadvantage is that now it's a large enough rest warrant that is going to behave as a lake dr. Rick de Leon and his team of divers are fighting an ongoing battle against a mighty army of small but persistent quagga mussels these mussels can actually grow to very high densities hundred thousand per square meter is not uncommon they have been documented to grow up to seven hundred thousand per square metre the mussels have no direct effect on the quality of the water but if left unmanaged they could block supply pipes to the city with potentially devastating consequences and when the mussels colonized they can actually close that space and not allow much water to go through and put a strain on the pumps so they need to be removed to allow the water to go through uninterrupted dr. DeLeon and his team placed test plates in the lake to monitor the muscles growth rate today divers Steve and Kelly are retrieving one that's three months old Steve and Kelly are the quagga throwing just on just rocks are they also going on the sill after a 30-minute dive Steve rises to the surface with the test plate it is completely covered in quagga mussels that's surprising how much they're still growing in there what death was this this was 53 53 so deeper than we thought the test plate reveals a steady increase in the number of cloggers one of the reasons why we monitor is to see is the frequency at which they need to go in there and clean up for dr. DeLeon this means that not long from now a full-scale unblocking operation will be needed to keep water flowing to Los Angeles for us it's really a matter of control over time to reduce the impact that it can have on us and prevent them from interfering with our normal operations humans cannot survive without a constant supply of drinking water in the next 20 years our cities will grow to such a point that demand will outstrip supply from rivers and lakes by 40% for cities like Barcelona that means a constant battle against drought the impact is already being felt by AG West L obligate one of the city's main drinking water suppliers we have not enough water to supply all these people in the last five years Barcelona has turned to a radical new source that could solve supply problems forever sea water but see water has a higher salt content than the human body can process drinking large quantities could result in death in 2009 the city built the biggest desalination plant of its kind in Europe on catalunya shoreline overseen by plant director Carlos Miguel Centeno this brightly colored super hub of pipes and pressure pumps is equipped to bring an average of two hundred million litres of seawater into the plant a day to make it drinkable it's killer salt content needs to be removed this desalination happened through a process called reverse osmosis and takes place inside these blue tubes seawater is pumped through a coiled membrane fine enough to filter out the salt molecules in the water it allows pure water to flow through to the next stage of its treatment and just minutes into the day shift engineers have found a problem with a pressure pump Carlos Miguel must act fast a faulty pump could seriously impact Barcelona's water supply see what's I can't keep flowing in during the membrane change so the control room shuts down a section of the plant this is not good news for Carlos Miguel as less water is now available to the city changing membranes is no easy task these seven heavy cylinders must be perfectly placed in their tube for their power and pressure connectors to work the team add a coat of glycerin to ensure they slide in smoothly and apply some heavy weight muscle [Music] once the tube is tightly sealed the pump can start up again bringing supply back to full capacity pumping seawater through an army of over 17,000 membranes is not enough to guarantee a safe drinking supply the city's water must go through several purification stages before it's fit for consumption [Music] and it's here in the plants laboratory where critical testing takes place before releasing drinking water into the city laboratories fundamental porque aquí están de contrôle ahmo's la calidad de funcionamiento el proceso tanto desde que cap tamos el agua lima a lord went o el president o hasta Fujinami n toda como esta no androgynous member anna fin hasta llegar al agua pursuit of inna allaha potami biochemist maria eugenia leads a team of scientists whose job it is to test samples from every step of the process after its journey from the sea and a battle against time this water is now safe for the city to drink desalination is important for Barcelona because with this new supply of water we have 20% of the water that Barcelona needs Barcelona's use of the sea could be at the forefront of a water revolution a way to guarantee future supply for the world's growing city populations [Music] cities don't just depend on water for drinking water ways provide a vital transport link for moving goods in and out of our cities London gateway today engineers are taking delivery of a fleet of cranes among the biggest in the world they're approaching British shores after a six-week journey from Shanghai this marks a turning point for London these key cranes are capable of unloading some of the largest cargo ships in the world at unprecedented speed engineer Russ Bruton is supervising the unloading it's a really big day in the life of lumps of us bought yeah we're all very excited about it here the UK is an island nation and 90% of our goods come in by sea and it's nothing new to have our port in London it's what the Romans first did 2,000 years ago it may be the same waterway but London is now a capital city with millions of inhabitants the key point is that this is the biggest consumer market in the UK this is Europe's largest economic area so we're once again going to bring the bigger ships in the world to the biggest point of consumption in the UK to do that we need some big pieces of kids each crane is 138 meters tall taller than the London Eye it's the culmination of years of planning and millions of pounds spent but Russ and his team were worried there's no crane in the world big enough to lift each 2000 ton steel structure onto dry land the only way to unload them is by dragging them off the ship this can only happen at high tide when the deck is level with the key side tide is flowing pretty quick at the moment then we've got one hour to get this crane back onto the land it's 2,000 ton we're on a moving vessel and if we don't do it in that hour then we end up with 2,000 ton of metal sticking out other terms and I'm not sure how we're gonna get that out the ebb and flow of the Thames tide can change water levels by a massive 7 metres rusts and the team only have one shot to get it right to roll the crane off the ship engineers must lay down for industrial sized bridging tracks the vessel and the dock must be perfectly aligned for the crane to slide off the tracks must be fitted in a matter of minutes but the team can't begin to put them into position until the ship and the key side are almost level this is it now this is the last couple of minutes just put the final bridge into position any second now this cranes gonna start rolling off the rails are aligned but the worst is not over yeah this is it the ropes the ropes all gone tight now you can see the crane starting to move this is the bit that we've all been waiting for and it's do or die they must make this work or risk costly delay we're now high tide you've got about 45 minutes to an hour to get this off safely onto the land there's another complication rust can't control so he relies on engineers aboard the vessel as the crane is unloaded its weight threatens to destabilize the ship to keep it level engineers must pump thousands of litres of water into the ballast tanks on the other side of the ship if they get it wrong the crane could slide off the ship and into the Thames on the key side engineers have wired in a network of winches pulleys and wire ropes [Music] this choreography of slow but meticulous pushing and pulling begins working in combination to control every move of this giant structure a sudden movement or level change in the water could spell disaster [Music] [Music] it's taken over 40 minutes of coaxing but finally the crane makes it onto dry land now the final bit is just to get it imperfect so when we lower it down then all the sit band centrally on the rails British and Chinese engineering teams have completed this mission and the construction of London's newest port is a step closer to realization thankfully there are no problems on this one and will went very smoothly very happy sweet is enough you never know but it all went very well [Music] waterways may serve to expand our cities but rivers can be treacherous pathways for city dwellers hundreds of boats carrying thousands of passengers use the Thames every day most journeys go off without incident but the river can be a dangerous place mainly the tide and the traffic so other vessels going up and down and and the weight tied more barges and boats and bridge piers this is a difficult environment for the rescue workers who police it last year the emergency services were called out over 850 times making this the busiest stretch of water in the country for rescuers it's the job of the Royal National Lifeboat institution a charity operating along the coast of the British Isles to act as the rivers first responders helmsman's Stan Todd has served almost a thousand hours for the team the temp can be quite ruthless face the currents and the coldness of the of the water coming down from the mountains it makes it a very hostile place this gives rescue services little or no time to save a casualty once they fall into the Thames you've got a lessee 15 minutes lifespan once you entered into this water RNLI tower station base is one of four on the Thames set up in the wake of the 1989 Marchioness disaster which claimed 51 lives [Music] since then the RNLI has rescued almost 3000 people from the Thames for volunteer John Mullin there's no other service completely committed to saving lives on the river the river is a problem for the standard emergency services so you're alive presence here gives a committed rescue service no other job to go out and help people that need the help there and they're the single biggest challenge probably is is trying to prepare for an event that you don't quite know how it's going to pan out we've been to people that's been having babies we've been to fires we've been to people are stranded in the mud could be anything that's part of the appeal of this job right now the London Coast Guard has issued an emergency call the RNLI crew has 90 seconds to get on the water on duty is helmsman Michael Neal and crew members Collin McCarthy and Giles Hauser a suspected incident at Westminster Bridge has put all the capital's rescue services on high alert police fire and ambulances are on their way but even more testing is the absence of information they're given the information that comes through to the Coast Guard is you know usually done in the panic it's not by any means the exact picture of what you're gonna get when you get there if a person falls into the Thames he or she only has minutes to live in water that's ten to fifteen degrees Celsius add to that a fearsome undercurrent and the chances of drowning a high it's not clear whether anyone actually went into the water but the emergency services have to take every report seriously crew members Michael Colin and Giles searched every meter of the river both sides of the bridge under yeah that was all received helmsman Michael kneeled needs to stay alert powerful currents around the bridges foundations could easily suck their vessel into its walls he's just on he's leaning on the side there's no further information to suggest anyone did go into the water it's starting to get dark if there was anyone in the river fast-moving currents would have carried them far downstream eventually the search is called off place of birth the team head back to their base it's not a question of if but when the next call will come in and for these young unsung heroes the battle on the Thames continues I'm not sure I'd really want to work anywhere else there's always something going on here which is the nice thing that's what I enjoy the most water can be our worst enemy but it can also save our lives it protects us from the most devastating of everyday disasters fire in 2011 the US Fire Department received reports of structural fires every 65 seconds we save lives and there is nothing more that you can do that's more gratifying than to save a life in New York there are almost 20,000 people per square kilometer that depend on the Fire Department's protection at all times [Music] the entire force is helpless without fast access to massive amounts of high-pressured water this City solution is a network of 110 thousand fire hydrants visible on every city street they connect the city's water mains directly with the fireman's hose for firefighter Michael Gallo hydrants are critical in a fight against fire fire hydrants in the city of New York are of paramount importance we rely on them it doesn't matter how good my rig is how fast I get there without water we don't put fires out 6 a.m. one of the city's vital hydrants has been knocked down by a car the Department of Environmental Protection is dispatching a replacement a broken hydrant could mean the difference between life and death John Castiglioni and his team have just two hours to fit the replacement but some hydrants in the city date back over 50 years this is the lead from back in the day if you see it's soft this was around the joint yesterday's technology see the comparisons this rubber gasket stays in a retaining plan back in the day they didn't they didn't have that technology the Hydra went in around the pipe who needs to make up the difference of space with the lay out today's technology you using the rubber gasket the retaining plan and the bolts they go in holds everything in place as the work starts there's an unusual amount of water coming out of the mains pipe making the attachment of the hydrants retaining gland an impossible task the team bring in a high-powered suction hose to rid the area of excess water right now we're going to install the hydrant right on the hydrant branch we're gonna fold it together and block it up take the bolts up up the back and then all come to hydrogen gate make sure to hide your work properly it's a tried and tested plan it takes five men and a crane to heave the three hundred kilogram hydrant into place they're trying to connect the hydrant to an older section of branch pipe and however many ways they try it doesn't fit being that you're trying to repair something that was installed you know between it's a 1902 1960s it makes the job bar a very challenging might not know if the jobs gonna take one hour two hours right now there's no space we're gonna have to cut the existing hide room French back a little more towards the street to give us a little more room the hydrant needs to fit perfectly a centimeter out and it will leak valuable water and pressure needed in the event of a fire the team need to shave off some of the existing iron pipe to get it to the right size at times it can be frustrating especially if you're working in inclement weather today right now it's a nice day so it's just part of the game you want everything to run smoothly but you expect little problems to go little by little fake it get personal or function a role not knowing what they're going to find every time they dig up the road is part of the job for John and his team which makes it very interesting each day to day job at the end of the day the jobs all get completed all the guys come in come into work safe and then go home safe the branch pipe sits right next to a network of vital city services the team must be careful not to puncture gas water telephone and internet lines there's a lot of utilities in a way steam mains and electric lines oil static lines so it's much harder to repair the hydrants [Music] finally the pipe is down to size and the workers try the installation again this time it works [Music] but the job isn't quite over the team must check all valves are tightened securely to avoid any valuable water seeping out and that the hydrant drains its own water correctly the last step in installing a hydrant is is making sure that the yoke the gasket and the retaining plan and the bolts are tight and you have the bar backing in a bucket out back at the hydrant so when you open it up any pressure against the hydrant it's fine and you open it up to make sure it's running fine as well once the final checks are made the surface area is restored with a layer of concrete but they don't they take for granted the work that goes behind a hydrant to keep it working this hydrant is now ready for action along with the other 110,000 in the city it's been a challenging day for the team as they continue to keep New York armed against the flames moving water in and out of our cities is vital to our survival protecting and maintaining the structures that make this possible is a massive challenge in San Francisco the threat to its water infrastructure is much greater in the next 20 years the chance of an earthquake of 6.0 magnitude or higher hitting the area is as high as 60% to avoid complete collapse the city is defending one of its oldest structures its sewer system against the next big one today veteran sewer inspectors Lorenzo Hale and Fred Gonzales are assessing a section of the sewer for structural damage but before their descent they must check for a dangerous occupational hazard methane gas we're about to put the gas meter hose inside the pick hole here just to test the atmosphere for any toxic gas or any methane because any little spark if it's Beth ain't gas could cause an explosion the guys have to go ahead but for their own safety they have just one hour underground before they must resurface San Francisco has one of the oldest sewers in the u.s. originally built for a population of approximately 50,000 people it's now a wastewater Network for a city 16 times that size it spans a staggering 1,500 kilometers and can carry over 1 billion liters of city wastewater a day the stress this puts on older sections of the network weakens its structure considerably and it's Fred Gonzalez's job to protect it from collapse 99% the people probably don't even realize what's underneath the city until they have a problem nobody really cares their workspace is cramped hot and dark and what we look for in this joint or any kind of infiltration of water sand coming through a joint in the tunnel indicates a weakness that in the event of an earthquake could cause a total collapse there's no sand between this and the street but enough sand washes away and a bus drives over it the bus will actually fall into a hole this joint is looking good for now but a section of the wall further along the tunnel is cause for concern the wall has been damaged during the winter rainy season when these tunnels run at full capacity if you look right here all this here is signs at one time the water level was this high up to here all these are all remnants of toilet paper and stuff that sticks to the wall so when it rains this runs full capacity almost this sewer collects more than 300 million litres of wastewater a day enough water to fill a hundred and twenty Olympic sized swimming pools but when it rains heavily it can be six times that amount of water these big sewers because that's where a lot of damage is being done which is gonna just cause big problems later structural weaknesses in any part of the sewer must be dealt with straight away [Music] Lorenzo and Fred have reached their time limit and climb up to fresher air but the job isn't quite finished a team of plasterers is on its way to carry out the emergency repair strengthening this small section of sewer looks simple enough but like Lorenzo and Fred this team has a short window of time in which to carry out their work potentially toxic gases and dark and damp conditions mean workers can't stay underground for more than an hour this constant cycle of inspection and repair is the only way to keep San Francisco's sewage structure safe these are the sewers only hidden heroes across the city another Rapid Response Team has received a call-out people might wash a lot of grease down the drain no computer time it blocks the train or flush too much toilet paper there's a blockage in one of the smaller sewer pipes that connects the main drain causing war sewage to leaked onto the streets veteran service engineer Jose Ledesma is proud of his part in keeping sewage flowing under the city I've been working for this is a weird apartment for 16 years and I've been doing this kind of work for 30 35 years now and I'm impressed with what San Francisco's got it's got good equipment good tools for the sewer problems that we encounter and today is no different well responding to an emergency it's actually called a side service emergency backup what it's doing it's overflowing it's not going out to the main but the size of the pipe means that Jose can't go down to fix it instead it's a job for Betsy this is it this is the one that gets all the work done right here Betsy is a 60 centimeter long stainless steel explosion-proof video camera that can get to places humans can't on this job Jose and Warren best are hoping she can show them what the mystery blockage is it's a tool you know I got a treated like part part of your job without this here and you can't do nothing either we ain't gonna have no no results on what the problem is Betsy's always gonna get get the job done from the back of the van Warren controls Betsy as she travels down into the depths of the sewer we need the pen until basically to see 360 degrees of the pipe any defects that that we might have you know in the pipe all right here on my increase to speed fifteen meters into her search and Betsy comes across the problem area a large amount of grease from a nearby restaurant has built up in the pipe it needs to be removed and it's Don's job to dislodge it with a high-pressure hose and an industrial solvent capable of breaking down the grease but the cause of the blockage is the usual offending items paper towels are bare diapers they don't break down fat paper towels and diapers absorbing they can we blow up they take ten times of bargain the jet works the blockage free it's another battle one for the emergency team but maintenance alone is not enough to keep a city's sewage system working in downtown San Francisco critical construction work is being carried out to protect a main wastewater pipe from collapse the North Shore force main a pressurized pipe over two kilometers long moves untreated wastewater through the city but it has failed twice in the last five years a bypass pipe is being built while vital repairs are carried out on the main pipe this requires digging up the road right in the heart of the city the team make every effort to reduce the amount of road surface they need to dig up but there's no escaping the dangers of working in this densely populated area where we are right now the heart of the financial district we have apartments condominiums tourists visitors workers during any given day the population of San Francisco doubles when the workforce enters the city so we have to maintain that support despite these challenges round-the-clock maintenance and new construction play a vital part in keeping the city's waste water flowing out safely but it's only half the battle if left untreated wastewater can spread disease the average city dweller uses approximately 200 litres of water a day flushing the toilet taking a shower or doing the washing up in Stockholm over 350 million litres go down the plughole on a daily basis and it ends up here this is henrik style one of the largest underground wastewater treatment plants in the world it's so vast operating technician dennis Goffin depends on his scooter to get around the plant it's about 20 kilometers of tunnels 300 thousand square meters of area 7 digesters about 30 tanks it's a big place one second you're sitting here in front of a computer screen and the other second you're down in like one of the filthiest places in Stockholm Denis is one of a team of 28 whose job it is to process millions of litres of wastewater a day disposed off by over 700,000 people but after so long in the job Denis no longer thinks about where the waste has come from we don't even think that it's people's waste anymore you just think that it's just some dirty mr. has to be clean you don't even consider that it comes from someone most impressively 98% of the wastewater that comes through Henrique style goes back into the Baltic Sea clean enough to swim stop Thomas Islands and water that's all it is so we have to protect that environment that's why it's important to keep this process going and keep it getting better each day it's a mammoth task in the plants control room Computers monitor the intake of thousands of litres per second which varies based on the time of day so you can see that the fluctuates in the middle of the day it gets us about yeah about 3000 and then at night time all the way down to only 1,000 even below that sometimes waste rush hour is right now at 7:00 a.m. as stockholms residents all head to the bathroom the plant can often run over full capacity we see at about twelve thousand liters a second came in and that causes trouble in just one hour the plant is capable of ingesting over 36 million litres of wastewater and down in the depths of the mountain Dennis's colleague process engineer Hannah Oswalt is heading off to monitor the first stage of the cleaning process Henrik style has a surface area the size of over 30 football pitches like Dennis the only way for Hannah to get around to complete her morning checks is to take the latest model of sewage plant transport everybody needs a wife or a moped to work in this motorized trike is a definite upside to a job that sees Hannah exposed to thousands of liters of her fellow residents waste as we can see there's a lot of beverage from the humans step screens extract any debris bigger than three millimeters from the water that includes ten tons of earbuds tampons and condoms a week these items could cause devastating damage to machinery and bring the plant to a halt I think people sort of think that they can throw anything into toilet but for us it's a big problem because this material creates a great damage if they continue through the process but the items aren't limited to what goes down a toilet the city's drains also empty into this facility with some surprising results a bicycle a canoe and we have seen driving license and even teeth from people so I don't think we can be any more shot here at the sediment tanks gravity does the work solid matter or sludge sinks to the bottom whilst cleaner water flows from the top but it doesn't always go to plan today Dennis and Hannah have noticed something strange during their daily inspection an abnormal buildup of sludge we're seeing sludge that should be sinking but for one reason or another some bad bacteria has formed and not been taken care of in the biological cleaning process which means it comes down to this process and creates these carpets which causes it to float up with epic volumes of wastewater to process everyday Hannah and Dennis can't afford to let one defect in the chain affect the next however small a problem it could escalate in a matter of minutes and have a detrimental effect on the quality of clean water going out of the plant the team leave nothing to chance and draft in another young member who gives the sludge a helping hand to sink to the bottom this is regular everyday business to just go through the entire process does it smell bad that means it's probably a problem somewhere does it look bad my girlfriend doesn't know what my good Carbon tails no one knows what I work with people don't even know how big this place is one of the final process is known as the biological stage is critical to making this water clean enough to swim in and it's completely invisible good bacteria devours the organic matter and nitrogen in the waste and 24 hours later the result is this water in mr. koozie style outflow is on its way back to the Baltic Sea at an average speed of 2,000 liters per second our job is to clean the water from this domestic we saw into water that we can actually put back into the Baltic Sea with a clear conscience you don't have to go back that far to see a time where you could not swim in stock on they would say it was actually illegal to swim anywhere in the city of stockholm and now you can swim anywhere you can ask anyone in stock in most water treatment plants this is where the story ends but Hendrick style is one of the few plants around the world reducing the amount of water waste even further while some plants discarded Dennis and his team consider it one of their most prized products we mix the primary sludge with the secondary sludge with the organic matter that comes in to our organic station this all gets mixed together and with these pumps pumps into the digesters to begin creating biogas our advantage that we are so big in that we get so much in that we can actually do this stuff that we can actually make this much gas after leaving Henrik style waste matter goes to a further refining stage before arriving at peerless bus depot in the form of biogas here a fleet of about a hundred and twenty buses take minutes to fuel after a twenty two hour shift on the city's roads but the difference is that this biogas is entirely renewable and much less polluting than ethanol or diesel it's the way forward for technical adviser Erik Norden I'm proud to say that's our fleet here runs on biogas I would like more companies to go with it because it's good it's really good fuel out of waste you know people flush their toilets and the currents in the fuel for Parsa buses Henrik's Dahl turns a record 1 and 3/4 trillion liters of wastewater a week back into clean water and biofuel making this plant a model for the future [Music] cities around the world depend on the skill of engineers scientists inspectors and technicians to keep our water flowing without this hidden army working tirelessly around the clock our survival well-being safety and prosperity would be seriously at risk

Channel: Spark

Views: 555,054

Rating: 4.7290287 out of 5

Keywords: water documentary bbc, Royal National Lifeboat Institution, colorado river, hoover dam water release, hoover dam documentary, water documentary national geographic, Water Filtration, How Cities Work, RNLI, water documentary full movie, Spark, Science, Technology, Engineering, Learning, How To, education, Science documentary, documentary, factual, mind blown, construction, building, full documentary, bbc documentary

Id: 7URYYiNdbXQ

Length: 49min 59sec (2999 seconds)

Published: Wed Oct 30 2019