Improved semi-distributed model for phosphorus losses from Irish catchments.

Phosphorus (P) is one of the important limiting elements governing the quality of natural waters in Ireland. Good models that simulate the loss of P from catchments to water bodies are needed to understand the mechanism and transport of P and to assist in formulating appropriate policies and practices to control or manage the problem. In the present study, a new combined model (NCM) is developed as ahybridbetween soil and water assessment tool (SWAT) and Hydrological Simulation Program FORTRAN (HSPF) packages.