colony of rats on the surface and almost certainly numerous complaints to the control agency. In short, the uncontrolled populations of rats in sewers constitute a reservoir which extends into all parts of a city and is capable of establishing new infestations on the surface. The structural damage caused by sewer rats can be considerable. They are
The Saffir-Simpson scale measures the intensity of a hurricane. Wind speed is measured on a scale of 1-5 to give an estimate of potential property damage and flooding along the coast. The Categories are as follows: Category One Hurricane: Winds 74-95 mph.
While synoptic charts do not distinguish between the different types of winds, some do show wind direction and wind speed. Wind direction can be measured using a weather vane, which is a device that turns on an axis to point in the direction of the wind.n a synoptic chart, rainfall is usually shown using shading. This shading is often explained in the legend as representing the areas which received rainfall in the last 24 hours. Not all synoptic charts show rainfall using shading.