An injury also forced Greenaway to retire from his match against Aryk Whalley of New Zealand.
He was also famous in Tashkent as a competent engineer and irrigator, constructing two large canals, the Bukhar-aryk (which was poorly aligned and soon silted up) and the much more successful Khiva-Aryk, later extended to form the Emperor Nicholas I Canal, irrigating 12,000 desyatinas, 33,000 acres (134 km²) of land in the 'Hungry Steppe' (Голодная степь) between Djizak and Tashkent.