Not sure what you mean by point-scale studies. Any study will have a finite scale - the smallest I know of was some work done by CSIRO near Townsville that included observations at about a 0.1 sq m scale. I don't know of any publications that came from that part of the study however (it was a dry tropical region, so not a lot of events). Up to what scale would you be interested in?
We built some turf grass runoff plots (24 in total) fully instrumented with flow meters and automated samplers about a year ago. They are 4.12 m x 8.23 m each plot on an average 3.7% slope. We should start publishing some data on them in the next 6 months
We studied runoff and soil erosion processes on plot scale (0.5 m2). The outcomes are published in JGR.
Plot scale runoff studies are standard. People have used different dimensions of the plot for the experiment. Runoff is collected at the end of the plots for each rainfall event and runoff processes are analysed. Soil erosion are also studied in a similar way. The data found from such studies are only indicative of mechanisms and processes. Actual runoff or soil erosion will require data at a larger scale.
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