A. Is the answer to this question
A GPS is general positioning system and the GIS is geographic information system and aerial imagery is taking Photos from direct down or elevated down position
Discharge data from stream gauges are the most important data for studying the potential for flooding along a river for several decades into the future.
Move level (or water level) and streamflow (or discharge) are measured at locations called streamflow gaging stations. The stage is measured and recorded continuously by means of electronic devices.
Discharge, that's every now and then known as streamflow or water drift, is described because the charge at which an extent of water passes with the aid of a selected place. Discharge and gage peak are associated values.
It's far crucial due to its impact on water exceptional and on the dwelling organisms and habitats in the stream. large, unexpectedly flowing rivers can receive pollutants discharges and be little affected, while small streams have less capability to dilute and degrade wastes.
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