Two linked line charts depict monthly water levels for two well measurements, with the lower chart providing a synchronized brushing interface. Dragging a brush across the lower chart dynamically updates the upper chart's x-axis domain to the selected time range, using a time scale inversion to set the new coordinates. The visualization is rendered with SVG, and the interaction is implemented using D3 v5's `brushX`, `scaleTime`, and `setBrushCoords` callback, with data loaded from a CSV file. Both charts use D3's `nest` and `line` generators to draw the series, and categorical colors from `schemeCategory10` distinguish the two data series.