???? ????????? ?????? ????? ?????? ??? ??? ??? ???????? ??????? ??? ????An isohyet or isohyetal line (from Ancient Greek ????? (huetos) 'rain') can be a line on a map joining factors of equivalent rainfall inside of a supplied period. A map with isohyets known as an isohyetal map.On these traces at chosen distances points are marked and concentrat