A hyetograph is a graphical representation of

✅ Explanation:
Rainfall hyetograph shows Intensity of rainfall v/s time. For example,
Mass Curve: Cumulative rainfall vs time
Double Mass Curve: Cumulative rainfall of nearby stations vs cumulative rainfall of concerned station
Hydrograph: Discharge vs time
Hyetograph: Rainfall intensity vs time
DAD (Depth-Area-Duration) Curves: Rainfall depth vs area & time