What Is Sciatica? Sciatica refers to back pain caused by a problem with the sciatic nerve. This is a large nerve that runs from the lower back down the back of each leg. When something injures or puts pressure on the sciatic nerve, it can cause pain in the lower back that spreads to the hip, buttocks, and leg. Up to 90% of people recover from sciatica without surgery.
River flooding occurs when river levels rise and overflow their banks or the edges of their main channel and inundate areas that are normally dry. River flooding can be caused by heavy rainfall, dam failures, rapid snowmelt and ice jams.
A flood is caused by a combination of heavy rainfall. causing river / oceans to over flow their banks, and can. happen at any time of the year, not just in the winter. Floods generally develop over a period of. days, when there is too much rainwater to fit. in the rivers and water spreads over the land. next to it (the âfloodplainâ). However, they can. happen very quickly when lots of heavy rain. falls over a short period of time.