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By Webster A. G.

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Additional resources for Acoustical Impedance and the Theory of Horns and of the Phonograph (1919)(en)(8s)

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Design is capable of revealing and integrating. It can embed the solution to environmental problems in land use, transportation, and the urban way of life. The characteristics of a place can make the processes through which hydrologic and ecological restoration take place visible and comprehensible. What a system looks like, how it functions ecologically and socially, and what it symbolizes in the way of stewardship can be congruent. One can lay hands on the details of construction materials to bring restorative processes to every inch of an inhabited place.

19 shows a plastic geocell grid being installed in a parking lot at a fraternity in Athens, Georgia. The geocell is to reinforce porous aggregate which will be placed in the grid’s cells. When the fraternity moved into its new building, a local ordinance required it either to reduce its impervious cover or to control the excess runoff from impervious surfaces. There was no room for stormwater control basins on this small in-town lot. So the fraternity made its parking lot pervious by surfacing it with geocell-reinforced aggregate.

POROUS PAVEMENT COMPONENTS Pavements, porous and dense alike, are assembled from several types of components. 1 defines some potential types of components. Few pavements contain all of the listed components; instead, each pavement has a specific combination of components to meet its own requirements. SURFACE AND BASE COURSES The construction of a pavement in two or more courses (layers) is common. Differentiating the courses allows each layer to be optimized for the special purpose it serves in the pavement, and the structure as a whole to be built with the least possible expense.

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Acoustical Impedance and the Theory of Horns and of the Phonograph (1919)(en)(8s) by Webster A. G.

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