The paper deals with technogenous processes and landforms within the zone of the Kara-Kum channel which is the largest man-made channel of the Central Asia, Causal relations are analysed in connection with the hydrotechnical construction impact on the environment. A classification of technogenous processes and landforms is developed. The processes and forms studies in the zone of existing irrigation construction permits to approach the forecast of similar formations in future channel zones (if the environments resemble those under consideration) with view to nature's conservation.