LTSER Neajlov catchment - Romania

The core components of the water network include the river Neajlov and its three major tributaries ? Dambovnic, Glavacioc and Calnistea.The overall catchment comprises 48 sub-catchments with surfaces between 10 and 664 km2, which have been further clustered into 9 sub-catchments. During last five decades in the Neajlov catchment a set of hydrotehnical projects have been implemented, aiming to establish water reservoirs, embankments, new canals for water diversion and river stretch regulation. Along the main water courses of the hydrological network have been created 95 water reservoirs aiming to serve different uses ? irrigation, intensive fishery, industrial and households water supply, from which the most important are Gradinari, Facau and Bila 1. The detailed water balance for the period 1995-2001, was evaluated with SWAT model (Danielescu, S., and Postolache, C., unpublished data) and MONERIS (MOdelling Nutrient Emissions in RIver Systems) model (Postolache, C., unpublished data). It was observed that regions located in the northern and western part of the catchment are characterized by high values of surface runoff (18-20 mm/a annual average) and as a consequence by high values of total water yield (75-91 mm/a annual average). The infiltration (366 - 377 mm/a) and evapotranspiration (379 / 397 mm/a annual average) are lower than the catchment average (394 / 409 mm). These factors together with the soil properties suggest a very rapid circulation of water from upslope to the river, mainly through surface runoff. The soil water content has the lowest values for the entire catchment (between 41 mm/a and 50 mm/a). Regions located in the central and southern-western, southern-eastern parts of the catchment are characterized by lower values of surface runoff (11-13 mm/a). The infiltration level is greater for these areas, but is balanced by a higher level of evapotranspiration (420-432). Groundwater discharge varies from 7 mm/a to 89 mm/a, and soil water content lies between 72 mm/a and 122 mm/a.