Part 3: Designing a Flood-Resilient House
You will hear two architecture students, Priya and Tom, discussing their design for a flood-resilient house.
Lời thoại bài nghe (transcript)
Tom: Right, Priya, we've got the tutorial on Friday, so we really need to agree on the final version of the flood house. Shall we start by going back to the brief?
Priya: Good idea, because I think we drifted away from it a bit in the first draft. The competition isn't asking for a house that keeps water out completely. The organisers say quite clearly that in most places that's unrealistic. What they want is a home that can be flooded and then be lived in again within a few days.
Tom: So it's about bouncing back quickly rather than resisting the water. Yes, that's fair. Which brings us to the stilts. I know you were never keen on putting the whole house up on stilts.
Priya: No. You thought the problem was the cost, didn't you?
Tom: I did, but when I checked, it was actually no more expensive than reinforcing the ground floor. And I don't think it looks bad either.
Priya: It doesn't. My objection is that the brief says the house has to be suitable for older residents, with step-free access. If the living space is two and a half metres off the ground, you'd need a long ramp or a lift, and neither is practical on a narrow plot.
Tom: True. OK, so stilts are out. What about the floors? You suggested ceramic tiles throughout the ground floor.
Priya: Yes. People assume tiles are chosen because they're cheap, but they're not especially cheap. The real point is that water doesn't soak into them, so once the flood goes down you can hose them off and they dry in a day or two. Wooden floors or carpet would have to be ripped out and replaced.
Tom: Makes sense. Now, the tutor's comments on the first draft. I was expecting her to say the design was too expensive, but she hardly mentioned money.
Priya: No, her main criticism was that we'd focused entirely on the building and said almost nothing about the ground around it, where the water goes and how quickly it drains away.
Tom: That's fair. We had one sentence on drainage, I think. So what do we do next? Should we redo the drawings?
Priya: The drawings are mostly fine. I think what would really help is a cross-section showing the house and the garden together, with the water level marked. That would deal with her point directly.
Tom: Agreed. Let's make that the priority this week. Then let's go through the individual features. Starting with the boiler, which in the first draft was in the utility room on the ground floor.
Priya: That has to go upstairs. If it's under water, it's ruined, and nobody can live in the house without heating. We'll put it in the loft.
Tom: Fine. The electrical sockets?
Priya: I looked at moving them all up to about a metre and a half above the floor, but honestly, that's already what we had. I measured the drawing again yesterday, so they can stay exactly where they are.
Tom: Good, one less thing to change. What about the garage? I know it took up most of the ground floor.
Priya: I'd get rid of it altogether. Cars can be parked on the driveway, and that frees up space we can use for storage that can be safely flooded.
Tom: I agree. Then there's the garden wall. We'd planned a solid brick wall around the whole plot.
Priya: It looks smart, but brick is expensive, and our budget is already stretched. What about a low earth bank with plants on it? It would slow the water down just as well and cost a fraction of the price.
Tom: Let's do that. And last of all, the rainwater tank. I'm honestly not sure whether it belongs in a flood design at all.
Priya: Neither am I. Some people say collecting rainwater reduces runoff, others say it's irrelevant in a serious flood. Let's not decide on our own. We'll raise it with the tutor on Friday and see what she thinks.
Tom: Good plan. I'll start on the cross-section tonight.
Part 4: The Return of the Sleeper Train
You will hear part of a lecture on the history of overnight sleeper trains.
Lời thoại bài nghe (transcript)
Lecturer: Good morning, everyone. In this week's lecture on the history of transport, I want to look at a form of travel that many people assumed had disappeared for good: the overnight sleeper train. Over the last decade or so, sleeper services have been revived on routes across several continents, and I want to consider why they declined in the first place, why they're returning, and whether that return is likely to last.
Lecturer: Let's start with the origins. The earliest overnight services in the mid-nineteenth century were hardly luxurious. Passengers simply slept as best they could, sitting upright on wooden benches, and it was some decades before purpose-built sleeping carriages with proper beds appeared. When they did, they quickly became popular, and not mainly with tourists, as you might expect. Their real appeal was to business travellers. Someone could leave one city in the evening, sleep on the train, and arrive in another city in time for a morning meeting, which meant they saved both a hotel bill and a whole working day.
Lecturer: So why did these services go into decline in the second half of the twentieth century? It's often said that high-speed daytime trains killed them off, and they certainly played a part on some shorter routes. But the evidence suggests that the decisive factor was the arrival of low-cost airlines. Once a flight was cheaper than a sleeper berth and took a fraction of the time, it was very hard for the railways to compete, and operators gradually withdrew services that were losing money.
Lecturer: The revival we've seen recently has been driven above all by concern about emissions. A growing number of travellers, particularly younger ones, are choosing to avoid short flights for environmental reasons, and a sleeper train offers something a daytime train can't: it covers a long distance without using up the passenger's day. Some governments have also offered financial support, seeing night trains as a way to reduce domestic air travel.
Lecturer: However, and this is the important part, the economics of sleeper trains remain extremely challenging. Let me go through the main problems. The first is capacity. A carriage fitted with beds holds far fewer passengers than one fitted with seats, so each passenger has to pay more. The second is what's called utilisation. A daytime train might make four or five journeys a day, but a sleeper carriage typically makes just one journey every night and then sits idle in a siding all day, which is a very poor return on an expensive vehicle.
Lecturer: Third, there are staff costs. Sleeper trains need attendants on board throughout the night, as well as people to prepare the beds and clean the compartments every morning. And fourth, there's the question of access to the tracks. Night-time is when most railway maintenance takes place, so sleeper trains often have to take slow diversions or wait for long periods, which makes the journey longer and less reliable.
Lecturer: So what does the future look like? Some operators are experimenting with new carriage designs. One promising idea is to replace traditional shared compartments with individual pods, which are small sleeping spaces for one person, each with a door that locks. These allow more passengers to fit into each carriage while still giving them privacy, which addresses the capacity problem I mentioned. Others are trying to improve utilisation by using the same carriages for daytime services as well, converting beds into seats in the morning.
Lecturer: My own view is cautiously optimistic. I don't think sleeper trains will ever compete with flying on price alone, and many routes will only survive with continued government support. But on journeys of around eight to twelve hours, where they offer a genuine alternative, I think they have a real future. Of course, much will also depend on whether travellers are willing to accept a slightly slower journey in exchange for a lower environmental impact. Next week, we'll look at how freight transport has changed over the same period.