Lepold Heindl, 62, a specialist on water resources with the U.S. Geological Survey, died Wednesday after suffering a heart attack while driving from his office in Reston to his home in Arlington.

He has been involved in U.S. participation in projects like the 1965-74 International Hydrologic Decade, the 1967 International Water for Peace Conference and the 1971 International Field Year for the Great Lakes.

Dr. Heindl joined the geological survey in 1951, after working for the Arizona State Land Commission. He conducted geologic and ground water studies in Arizona and the Southwest for the federal agency.

He was transferred to Washington in 1960 to become a reports specialist for the water resources division. As a science writer and editor, he was the author of more than 70 scientific reports editor of several journals and textbooks and an instructor for report specialists.

Dr. Heindl transferred to the National Academy of Sciences in 1966. As executive secretary of the U.S. National Committee for the International Hydrologic Decade, he coordinated the work of numerous governments, universities and technical societies.

He rejoined the geological survey in 1974, and became executive secretary for the U.S. National Committee on Scientific Hydrology to coordinate this country's activities in the international hydrological program of UNESCO and the World Meteorological Organization.

He also became deputy chief of the geological survey's office of international activities, water resources division. Recently he returned to Arizona to assist the Papago Indian Reservation in a ground water dispute with Mexico. He was in Somaliland this summer to aid that country in establishing a water supply program.

He was born in Leningrad, Russia, the son of an American citizen who was then in charge of a mining operation there. He grew up in the San Francisco area and graduated with a degree in geology from the University of California at Los Angeles. Later he earned a doctorate in geology from the University of Arizona.

He is survived by his wife, Florence M., of the home; daughter, Ruthann McGraw, of San Mateo, Calif.; two sons, Alex, of Portland, Ore., and Michael, of Ocean View, Calif., and sister, Dr. Irene Heindl, of Sea Ranch, Calif.