Light isn't some speed limit. There isn't a space cop telling you that you can't go faster. It's that, no matter how fast you travel, light will always seem to travel at the same speed, relative to you. It's space and time that bend around you as you approach the speed of light. So, if you go .9999c, you can reach places in a matter of weeks that are many light years away. But to those watching you back home, it will still appear to take you that many years to get there.
28 â¢ ArcGIS Hydro Data Model Virtual Catchments (Colored Areas) â Defined with the CostAllocation Function Hydro Response Units A Hydro Response Unit is an area of the land surface that has homogeneous precipitation and/or land surface characteristics.
Drainage basin (catchment area) is the area which supplies a river system, lake or reservoir with water. The whole area consists of smaller sub-catchments supplying tributaries of the main ri-ver and direct catchments, which drain straight into a lake or main river (Box 3.1).ts purpose is to co-nvey excess water from a drainage basin, which will include the products of weathering and addi-tional loads of solutes produced by man. This pro-perty makes a drainage basin an integrator and its operation is reflected in the quantity and quality of the river run-off.