We all know that roadkill is a tragic corollary of car culture. What you might not know is that it’s also mega-expensive. Vehicle-animal collisions cost Americans a whopping $8 billion a year.Design can help. Balmori Associates, a New York City landscape design firm, proposes building simple, inexpensive wooden bridges over highways, then covering them in native vegetation to create a sort of wildlife crosswalk. Each bridge would be so wide and the greenery so diverse, it’d appear like an extension of the forest, and animals, the thinking goes, would be less inclined to go galloping across roads helter skelter, resulting in fewer accidents (and a slimmer cleaning bill).Balmori came up with the idea for the ARC International Wildlife Crossing Infrastructure Design Competition, which bills itself as the “first-ever international design competition… intended to solve the problem of ensuring safe travel for humans and wildlife.” The contest ends in January, when one of five design teams is selected to build a bridge over West Vail Pass in Colorado. ARC expects the winning design to serve as a model for other parts of the country (clearly, the only way to make a dent in that $8 billion figure is to repeat the idea elsewhere). To that end, Balmori’s bridge isn’t specific to Vail. “It is a kit of parts,” the press materials say, “that can be applied and adapted to various conditions and sites.”
Showing posts with label can. Show all posts
Showing posts with label can. Show all posts
Friday, 22 June 2012
Can a Wildlife Bridge Fix America’s $8 Billion Roadkill Problem?
We all know that roadkill is a tragic corollary of car culture. What you might not know is that it’s also mega-expensive. Vehicle-animal collisions cost Americans a whopping $8 billion a year.Design can help. Balmori Associates, a New York City landscape design firm, proposes building simple, inexpensive wooden bridges over highways, then covering them in native vegetation to create a sort of wildlife crosswalk. Each bridge would be so wide and the greenery so diverse, it’d appear like an extension of the forest, and animals, the thinking goes, would be less inclined to go galloping across roads helter skelter, resulting in fewer accidents (and a slimmer cleaning bill).Balmori came up with the idea for the ARC International Wildlife Crossing Infrastructure Design Competition, which bills itself as the “first-ever international design competition… intended to solve the problem of ensuring safe travel for humans and wildlife.” The contest ends in January, when one of five design teams is selected to build a bridge over West Vail Pass in Colorado. ARC expects the winning design to serve as a model for other parts of the country (clearly, the only way to make a dent in that $8 billion figure is to repeat the idea elsewhere). To that end, Balmori’s bridge isn’t specific to Vail. “It is a kit of parts,” the press materials say, “that can be applied and adapted to various conditions and sites.”
Tuesday, 5 June 2012
Can all utility detectors detect the depth of utilities?
In Hong Kong, underground utility detectors are normally divided into
two types: electromagnetic detector and ground penetrating radar (GPR).
For electromagnetic detector, it can detect the signals emitted by metallic utilities themselves by passive mode. While in active mode, the detector has to pick up the signals through a transmitter and sonda connected directly to the non-metallic utility. Both the alignment and depth can be found in active mode while only alignment can be found in passive mode. The electromagnetic detector available in market can detect utilities up to depth of 3m.
For ground penetrating radar, it sends radio waves into the ground and receives signals from reflections from utilities. It has the advantage of locating both the depth and alignment of utilities. More importantly, it can detect both metallic and non-metallic utilities. However, it suffers from the disadvantage that it is quite expensive and interpretation of data is not simple. Reference is made to LD, DSD (2000).
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
For electromagnetic detector, it can detect the signals emitted by metallic utilities themselves by passive mode. While in active mode, the detector has to pick up the signals through a transmitter and sonda connected directly to the non-metallic utility. Both the alignment and depth can be found in active mode while only alignment can be found in passive mode. The electromagnetic detector available in market can detect utilities up to depth of 3m.
For ground penetrating radar, it sends radio waves into the ground and receives signals from reflections from utilities. It has the advantage of locating both the depth and alignment of utilities. More importantly, it can detect both metallic and non-metallic utilities. However, it suffers from the disadvantage that it is quite expensive and interpretation of data is not simple. Reference is made to LD, DSD (2000).
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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