posted by sam .
what causes a change between high and low discharge levels!?
please could someone help me!?
Thank you for using the Jiskha Homework Help Forum. You don't state exactly what you are referring to. If it is lighting, it wouldn't be under "geography," which is your heading. If you mean the water in rivers, look below:
1. (PDF file to download):
2. (1993 compared): http://www.gabcikovo.gov.sk/doc/jr2001en/ch3.html
3. (precipitation & spring): http://gsa.confex.com/gsa/2007AM/finalprogram/abstract_127166.htm