Flooding analysis, work flow with Global Mapper 

You are welcome

Welcome!

welcome

When you perform the Water rise calculation, change the resolution (with smaller figures). It should improve

@@AndreaCippa-Siteplanning ....Thanks, What is the use of "Increase the water level by Elevation.....?? and which is the ideal elevation we should give...?.......and if I m not using elevation then water is not coming out of drains even after increasing water level by 1000m

@@alkeshmakwana860 Hello, Water Level Increase Amount is the interval that you choose to increase the water each time you click on the icon "increase water level"

in Global Mapper, you can convert a point or a line in a shape and give the relative flooding elevation from the shape or you can give the absolute elevation without any shape reference

@@AndreaCippa-Siteplanning can we automate it without putting points and areas.

@@raffygumangannet probably I do not understand your question. Pls contact me with skype: cippaandrea

no idea, download it with SAS Planet, see my tutorial

no need for sea level, you need to know the location of the highest water level during the extreme event

in this case you need to ask local people and take the gps location