The rivers flowing from the north-eastern slope of the Greater Caucasus are among the rivers that flow directly into the Caspian Sea. Sludge, sand, various suspended solids, organic compounds, mineral salts, etc. in river water. both naturally and through irrigation. As a result of multi-year irrigation, agro-irrigation horizons of different thicknesses are formed by the accumulation in the soil of water-derived organic and mineral compounds. Significant changes in the mechanical composition of the soil occur due to the accumulation of materials here. First of all, the amount of small fractional physical activity increases, geophysical and geochemical processes change. The density of the soil increases, the reclamation condition deteriorates, the drainage capacity weakens, and the air and water regime are negatively affected. During the research, the hydrological features of the area rivers, feeding regime, areas irrigated by the rivers, ecological analysis of the river and canal waters and the complex of physical-geographical factors causing it were studied. Key words:water supply, water consumption, irrigated areas, canal water, ecological analysis of river water, physical-geographical factors
Long-term changes of river discharge regime in Latvia