JOINING the points of equal rainfall.An isohyet is a contour line drawn on maps that connect places or points that RECEIVED the same amount of rainfall or precipitation at a given period of time.It is used to represent areas that received a similar amounts of rain or equal density of rain during a particular storm.These lines HELP to estimate the various rainfall parameters like the minimum and maximum, an average rainfall of a particular region.A map formed by these isohyetal lines is called the isohyetal map. Name of the linePoints of equalIsohyetsRainfallContourElevationIsoclinicDipIsogonicMagnetic declinationIsobarsPressureIsohumeHumidityIsothermTemperatureIsohelDuration of SUNSHINE