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(ˈhaɪdrəˌɡrɑːf; -ˌɡræf)
(Physical Geography) a graph showing the seasonal variation in the level of a body of water, from which its velocity and discharge can be calculated
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhaɪ drəˌgræf, -ˌgrɑf)

a graph of the water level or rate of flow of a body of water as a function of time, showing the seasonal change.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Determining the Discharge Hydrograph for the Golubinka Spring and the Groundwater Level in Aquifer
It can support flood modeling, geomorphological and geophysical impact studies, and instantaneous unit hydrograph and risk analyses, among other investigations.
Three different methods including empirical unit hydrograph method, Muskingum channel routing method, and linear reservoir parameter method are applied to calculate these three components, respectively, and finally the outlet runoff is obtained.
Figures 2(a) and 2(b), respectively, show the hydrograph of surface inundation for parameters calibration and validation.
Six hourly flow hydrograph and stage hydrograph (25 July 2010 to 31 Aug.
"Based on our hydrograph during an El NiAaAaAeA~o event in 2010, the Ang Dam was able to increase its level to 210-212 meters during the July to September period.
Sixteen of 20 community experts observed changes in the annual hydrograph and sediments on the Yukon River at Ruby.
In this method, the height of runoff from rainfall and maximum instantaneous flow rate is calculated by unit hydrograph method through the following equations:
(2) Generally, two processes, quick flow and slow flow, are apparent and control the characteristics of a karst flow hydrograph [17, 32].
Many factors likely have caused the decline, but two primary factors include effects from dams (fragmentation of populations, altered hydrograph, thermal regime; Carlson and Muth, 1993) and predation by nonnative fishes (Bestgen, 1990; Minckley et al., 1991).
Hydrology analysis for Way Pegadungan used Synthetic Unit Hydrograph GAMA I [11].
Chlorophyll-[alpha] and dissolved oxygen data were collected at different hydrograph states (receding, low, rising and high water) in the Lago Grande de Curuai floodplain (Figure 1).