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    NEXT WEEK

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    Quizzical Pursuit
    —The Architecture Puzzler

    Created by Dave Guadagni

    Solution to Last Week's Puzzler
    Architecture Puzzler #221

    Question

    Suppose you have a 48-foot- (14.63-meter-) square section of concrete with a one-percent slope down to a center drain. If this center drain became plugged, how much water would the area contain before it flooded?

    Answer

    About 1380 gallons (5220 liters) of water. To calculate, you need to know that the volume of a pyramid is the area of the base multiplied by 1/3 its altitude. In this case the pyramid is upside-down with the drain at its apex.

    Base is 48 by 48 feet = 2304 square feet
    Altitude (slope X distance from edge to drain) = 0.01 X 24 feet = 0.24 feet
    Volume = 2304 square feet X 1/3 X 0.24 feet = 184.32 cubic feet At 7.48 gallons per cubic foot = 1380 gallons

    or

    Base is 14.63 by 14.63 meters = 214 square meters
    Altitude (slope X distance from edge to drain) = 0.01 X 7.315 meters = 0.07315 meters
    Volume = 214 square meters X 1/3 X 0.07315 meters = 5.22 cubic meters At 1000 liters per cubic meter = 5220 liters
     


     

    Okay, got it? Now try this week's Puzzler:

    http://www.ArchitectureWeek.com/quiz.html


     

    Dave Guadagni, AIA, is an architect with Robertson/Sherwood/Architects

    Quizzical Pursuit is Copyright 2005, Dave Guadagni.

    AW

    ArchWeek Image

    Flooding in Taiwan after a typhoon.
    Photo: www.clipart.com

     
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