Watershed response to produce runoff by a rainfall event depends upon the watershed characteristic and each watershed has its exclusive characteristics. However, most of the watersheds lacks in the facility of recording runoff, in such a case, morphometric parameters of a watershed are valuable information to evaluate watershed capacity to produce runoff.

For long, widely divergent views (based on isolated pieces of historical evidence or broad geological evolution of the subcontinent, notably the rise of the Himalayas in mid-late Miocene), had prevailed regarding origin and antiquity of the Thar Desert. Studies of the past few decades have since provided a wealth of new information on landform styles, evolutionary processes and palaeoclimate history with chronometric and isotopic constraints. Salt lakes, dunes and calcrete-bearing alluvial aggradations have been the focus of interest.

When humans try to constrain rivers, the results can be calamitous. (Editorial)

http://www.newscientist.com/article/mg21028142.700-mississippi-delta-blu...

Could the devastation caused by hurricanes Katrina and Rita have had a silver lining? The sediment washed into New Orleans by the floods accompanying the storms may have blanketed over heavily polluted, lead-laden soil in the city, leading to a decrease in lead levels in the bloodstreams of children across the city.

Increased erosion associated with the rise of the world's great mountain ranges has been held to be the cause of a prolonged episode of past climate cooling. That connection is now brought into doubt.