How precipitation is measured - Precipitation is generally stated in units of inches or centimeters that fall per unit of time. 'One inch of rainfall, for example, is a quantity sufficient to cover the ground to a depth of one inch, provided that none is lost by runoff, evaporation, or sinking into the ground.
A simple form of rain gauge can be operated by setting out a straight -sided, flat-bottomed pan and measuring the depth to which water accumulates during a particular period. Unless this period is short, however, evaporation seriously upsets the results. Furthermore, very small amounts of rainfall, such as 0.1 in. (0.25 cm), would make too thin a layer to be accurately measured. To avoid this difficulty, as well as to reduce evaporation loss, good rain gauges are made in the form of a cylinder whose base is a funnel leading into a narrow tube. A small amount of rainfall will fill the narrow pipe to a considerable height, thus making it easy to read accurately, once a simple scale has been provided for the pipe. This gauge requires frequent emptying unless it is equipped with automatic devices for this purpose.
Snowfall is measured by melting a sample column of snow and reducing it to an equivalent in water. Thus, rainfall and snowfall records may be combined for purposes of comparison.
Locals hypothesize that the legacy of Italian blood and culture in Cologne, colonized by the Romans more than 1500 years ago, makes the people more jovial and lighthearted. Cologne is the largest city on the Rhine.
Kolsch is not only the dialect spoken here but, also the name of their own top-fermented beer. There are more than 4,000 pubs, restaurant's and brewery taverns in Cologne.
Unlike many of the world's large cities, Cologne, with a population of over a million, gets better every day, there are more things to do and see, more new and innovative buildings... more
Travel is an opportunity to learn, whether geography, languages, history or other subjects.
Cologne is situated on the beautiful Rhine River.