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251 pages, Hardcover
First published November 1, 2022
Unlike other utilities, electricity is quite challenging to store on a large scale, which means power must be generated, transported, supplied, and used all in the same moment. The energy coursing through the wires of your home or office was a ray of sunshine on a solar panel, an atom of uranium, or a bit of coal or natural gas in a steam boiler only milliseconds ago.
Creating electricity in three distinct phases provides a smooth supply that overlaps, so there is never a moment when all phases have zero voltage.
An important part of a turbine’s efficiency is how fast the blades rotate. If they go too slowly, wind will pass through the gaps in the blades without providing any power. If they spin too quickly, the blades will block the wind, reducing the amount of power that can be harvested.
It turns out that a turbine is most efficient when the tip of the blades is moving around four to seven times the speed of the wind.
Radio signals generally can’t reach beyond the horizon, which is why many antennas are mounted at the tops of gigantic towers (sometimes also called masts). The higher they are, the farther their signals can extend.
If the pothole repair does not create a good connection with the rest of the roadway, a pothole can recur in the same location.
Uniformity is a crucial concept in traffic engineering. If all road users know what to expect, they are less likely to make errors in judgment that lead to collisions.
In the United States, the manual that governs the uniformity of traffic control devices is more than 800 pages long.
At intersections, reducing the curb radius can slow down vehicles making turns and shorten the crossing distance for pedestrians. However, doing so is feasible only in areas without much truck traffic (since they need more room to turn).
A speed hump is a tool to slow down vehicles on public roadways and is usually 4 meters (12 feet) in width. A speed bump is smaller in width but taller in height, and is intended for parking lots and garages. Speed lumps (also called cushions) are similar to speed humps, but they have gaps to allow emergency vehicles to pass through without slowing down.
the duration of the amber light is usually set to around one second for every 10 miles per hour or 16 kilometers per hour on the speed limit.
Now, almost all signs and roadway markings are retroreflective, meaning they reflect light back toward its source in the same direction as it came.
most people significantly underestimate the length of stripes on a roadway. They appear much shorter than the standard 3 meters (10 feet).
Unlike concrete, asphalt pavement doesn’t go through a chemical reaction to cure. Instead, we use temperature to transform it from a workable mix to a stable driving surface, a process that is entirely reversible and repeatable. That means asphalt is nearly 100 percent recyclable. In fact, asphalt concrete is one of the world’s most recycled materials by weight.
But concrete has some weaknesses. Although strong when compressed, concrete quickly fails when subjected to tension forces, those trying to pull it apart.
Reinforcement within concrete creates a composite material, with the concrete providing strength against compressive stress while the reinforcement provides strength against tensile stress. For bridge beams, this reinforcement is often pre-stressed. The steel bars are stretched and held taut while the wet concrete is cast into a mold. Once the concrete hardens, the tension in the steel compresses it tightly like a rubber band, making the beams stiffer and less prone to cracking. These beams are constructed in factories so they can show up to a job site ready to be lifted into place.
Most materials are stronger against forces along their axis than those applied at right angles (called bending forces).
Many consider suspension bridges to be the pinnacle of civil engineering ingenuity.
A significant proportion of flood-related fatalities occur when someone tries to drive a car or truck through water overtopping a roadway.
Rapid transit railways often use subterranean space, allowing them to avoid conflicts with surface roadways and other infrastructure. Because they usually aren’t far below the surface, many rapid transit tunnels are often constructed using the cut-and-cover method, starting with a trench.
Driving into a tunnel during the day creates a sharp transition from the bright sunlight outside to the artificial illumination inside the tunnel. Engineers call this the black hole effect. It can be a serious safety issue because human eyes adjust to changes in brightness gradually. Drivers can be blinded by the sudden darkness at the entrance of a tunnel and the subsequent brilliance at the exit.
Most tunnels have an arched or circular cross section because it’s the strongest shape against ground pressure.
the steel wheels on steel rails waste little energy to friction (especially compared to rubber tires on asphalt). Locomotives may look huge, but their engines are almost trivial compared to the enormous weight they move. If your car were so efficient, it could run off a tiny string-trimmer engine.
Incredibly, the contact patch between each wheel and the rail is only the size of a small coin. That means an average freight train sits on an area of steel roughly the size of this book.
Unlike motor vehicles whose drivers see and respond to hazards in real time, a train can take more than a mile to reach a complete stop. If a train operator can see an obstruction on the tracks while traveling at full speed, it is already too late.
People don’t travel long distances by boat as much nowadays due to lack of speed, but shipping got its name for a reason.
Moving one ton of goods the same distance on a boat takes roughly half the amount of energy that it would by train and approximately a fifth of the energy it would take on a truck.
Although levees protect low-lying areas from flooding, they can create new issues too. Since levees constrain the power of a river to a smaller space, the water flows higher and faster than it would have without such structures, potentially exacerbating flood impacts farther downstream.
Even with excellent engineering, our ability to “control” Mother Nature is usually tenuous.
If a vortex is allowed to enter the mouth of the pump column, the air will reduce its efficiency and may even cause it to fail. Vortex breakers are sometimes installed within sumps to keep the flow from swirling as it is drawn into the pump.
If you could create a complete vacuum in a straw, the highest you could draw a drink of water is around 10 meters or 33 feet. Thus, deeper wells cannot use suction to bring water to the surface. Instead, the pump must be installed at the bottom of the well so that it can push water to the top.
the word aqueduct generally describes any human-made structure meant to deliver water across a long distance.
The pressure that pumps provide not only induces the potable water to flow to its destination but also ensures that contaminants can’t enter the distribution system through open joints or small holes in the pipes. If leaks develop, water will flow out of the pressurized system rather than allow impurities or pollutants to enter.
Energy is often one of the highest ongoing costs for a water utility. Conserving water reduces waste of the water itself and reduces the significant amount of energy required to collect, clean, and deliver it.
Many jurisdictions require that water mains be horizontally separated from underground sewers, so when these lines run parallel, they are often located on opposite sides of a street.
The microorganism communities that thrive in oxygen-rich (aerobic) environments are different from those that live in oxygen-depleted (anaerobic) environments. These various colonies consume different nutrients from the water, so treatment plants often utilize both aerobic and anaerobic conditions to remove wastewater contaminants thoroughly.
Raw sewage is 99.9 percent water,
all subsurface utilities must be identified and marked to ensure that excavators don’t inadvertently damage underground lines. Locators use colored spray paint to create utility location marks on the ground. In many parts of the world, these colors are standardized. For example, red is used for electric lines, orange for telecommunications, yellow for natural gas, green for sewers, and blue for drinking water lines. White paint is used to show the location of any excavations that will take place during construction, and pink is reserved for survey markings.
on windy days, mobile cranes are generally taken down, and tower crane brakes are released so that the jibs can weathervane, allowing them to rotate freely with the wind rather than fight against it.