Data on “Matured gullies act primarily as sediment pathways rather than sources in catchment-scale sediment budgets”

This dataset contains rainfall, monitored flow and sediment rates, gully morphology, and erosion model simulation data collected between August 2023 and August 2024. The data were collected to support analyses of rainfall-runoff processes, sediment transport, gully erosion, and the calibration of the SIMWE erosion model.<br>Rainfall data include daily rainfall intensity, duration, and total rainfall amount from August 2023 to August 2024. Rainfall was measured with a rain gauge or an automated weather station and aggregated to daily values, following standard quality control procedures.<br>Hydrological and sediment data were collected using both manual field measurements and automated sensors. Manual measurements of water depth, flow, and sediment rate were taken twice daily in the morning and evening using standardised field methods. Automated measurements were collected using TD Diver sensors installed at fixed locations at the catchment outlet locations. These sensors recorded water depth and derived flow and sediment rates at ten-minute intervals. Sensor data were corrected and processed using site-specific calibration relationships.<br>Gully morphology data were collected during a field-based gully inventory conducted in Summer 2024. Measurements include gully dimensions and geometric characteristics obtained through direct field observation using measuring tools and GPS. The inventory followed a consistent protocol to ensure repeatability.The dataset also includes model outputs from the SIMWE erosion model. Flow simulations were generated for spring, summer, and autumn seasons and calibrated using Manning roughness coefficients. Sediment simulations were generated for the same seasons using transport coefficient, detachment coefficient, and critical shear parameters. Model calibration and evaluation were performed by comparing simulated results with observed field and sensor data.<br>All data collection was conducted in accordance with applicable legal and ethical requirements, with permission from relevant landowners and authorities. No personal or sensitive human data are included. The dataset is intended to support reproducible research in hydrology, erosion modelling, and sediment transport analysis.