There may be several levels to consider, the operational or conservation pool, the level when spillway begins to flow, and the level that the dam overtops. If you dont have ground survey with total station, or LiDAR for elevation detail, an estimate may be obtained from topographic map or from available GIS elevation detail that can be assessed from a digital elevation map (DEM). The old fashioned way was drawing the approximate boundary on a topograghic contour map and using a dot grid or planimeter set to scale of map, determine how many dots or area by drawing planimeter around boundary. Depending on the level of detail required, this can be relatively simple to moderately complex, quick to time consuming. If you have never done this, a civil engineer, hydrologist or GIS professional should have skills to show the steps, help or check your calculations. Basically, anything under the top of dam has potential to flood if the capacity of overflow channel is exceeded. If extreme floods are considered, and overflow channel insufficient, the level of flow above dam can be calculated, and dam face armored if needed for designed overflows.
There may be several levels to consider, the operational or conservation pool, the level when spillway begins to flow, and the level that the dam overtops. If you dont have ground survey with total station, or LiDAR for elevation detail, an estimate may be obtained from topographic map or from available GIS elevation detail that can be assessed from a digital elevation map (DEM). The old fashioned way was drawing the approximate boundary on a topograghic contour map and using a dot grid or planimeter set to scale of map, determine how many dots or area by drawing planimeter around boundary. Depending on the level of detail required, this can be relatively simple to moderately complex, quick to time consuming. If you have never done this, a civil engineer, hydrologist or GIS professional should have skills to show the steps, help or check your calculations. Basically, anything under the top of dam has potential to flood if the capacity of overflow channel is exceeded. If extreme floods are considered, and overflow channel insufficient, the level of flow above dam can be calculated, and dam face armored if needed for designed overflows.
hope these links are useful.
https://www.arcgis.com/home/item.html?id=fc59e452ca6945a885bba9d56df36ec4
https://watergis.wordpress.com/2012/09/30/calculating-the-volume-and-surface-of-a-reservoir-using-arcgis/
Making use of topographic maps (preferably with a contour interval of 1 or 2 metres) or through DEM using GIS, one can calculate the area of submergence due to a dam construction.
Thanks all for answering my question...
I have followed Raju Thapa link...using Arc GIS...and solved it.
Regards
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