RUNOFF FROM A NEW WATERSHED

ABSTRACT

A complex of hydrogeological, hydrochemical, and biochemical investigations aimed at developing methods for the quality control of irrigation return water and agricultural nonpoint discharge was conducted from 1981 to 1985. The chemical composition of drainage flow in the zone of transient humidification in the Ukraine has been investigated; some dependencies of salts and humidity transfer rates as a function of a range of irrigation and climatic factors have been established. A new so-called “bioengineering” type of water-protective structure based upon natural mechanisms of water purification has been developed. The efficiency of the bioengineering structure for the reduction of the content of nitrogen, phosphorus and some compounds has been determined as a function of temperature, duration of the flow contact with biogeocenosis, water column depth and other parameters.