ESTIMATION OF RUNOFF AND SEDIMENT YIELD OF UPPER EBONYI RIVER WATERSHED USING MWAGNPS

Authors

  • G. I. Ezenne Agricultural and Bioresources Engineering Department, University of Nigeria, Nsukka, Nigeria. Author
  • E. L. Ndulue Agricultural and Bioresources Engineering Department, University of Nigeria, Nsukka, Nigeria. Author
  • V. Ogwo Agricultural and Bioresources Engineering Department, University of Nigeria, Nsukka, Nigeria. Author

Keywords:

Watershed, runoff, sediment

Abstract

Information about runoff and sediment exported from watersheds as well as related erosive processes are
required by watershed managers and decision-makers. The event-based Agricultural Non-Point Source
(AGNPS) pollution model is used extensively to simulate runoff, sediment yield and nutrient transport in
agricultural watersheds. The present study estimated runoff and sediment yield of Upper Ebonyi River
watershed using Mapwindow AGNPS (MWAGNPS). The materials used for the study include the Digital
Elevation Map (DEM), the land use map and the soil map of the study area. The study was carried out
using 13 rainfall-runoff events, 5 for calibration and 8 for validation, from Upper Ebonyi River
watershed, Enugu State. The results obtained with MWAGNPS were compared with the observed data.
After the analysis, the coefficient of performance between the observed and simulated runoff and
sediment yield gave 1.3 and 1.4 respectively. Therefore, a calibrated MWAGNPS model could estimate
runoff and sediment yield in the study area within an acceptable estimation error.

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Published

2025-05-12

Issue

Vol. 22 No. 4 (2014): JOURNAL OF AGRICULTURAL ENGINEERING AND TECHNOLOGY (JAET)

Section

Articles