What is Hydrograph, Topograph, Hectograph, Monograph?


Hydrograph: A hydrograph is a plot of the variation of discharge with respect to time (it can also be the variation of stage or other water property with respect to time). Discharge is the volume of water flowing past a location per unit time (usually in cubic feet per second (cfs)).



Topograph: Topography is the study of the shape and features of the surface of the Earth and other     observable astronomical objects including planets, moons, and asteroids.The topography of an area could refer to the surface shapes and features themselves, or a description (especially their depiction in maps).


 Hectograph: The hectograph was an early duplicating method. "Hecto" means one hundred, so this is a method designed to make (roughly) a hundred copies of something. With the advent of cheap computer printers, there's not a lot of practical use for this technology. But it's a fun method of duplicating, and produces surprisingly good copies. With this type of gelatin duplicator, you start with the image on a piece of paper, you transfer the image to the gelatin, and then you transfer the image to blank sheets of paper.


Monograph: A monograph is a specialist work of writing on a single subject or an aspect of a subject, usually by a single author like research paper.

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