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Figure 3.2. Hydrograph of the Hudson River discharge (at Green Island Dam, Troy, NY). The bold line is the mean discharge; the shaded area spans the range from minimum to maximum observed daily values; the thin line is the discharge for 1998.

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Figure 3.2. Hydrograph of the Hudson River discharge (at Green Island Dam, Troy, NY). The bold line is the mean discharge; the shaded area spans the range from minimum to maximum observed daily values; the thin line is the discharge for 1998.

combines with spring rains. This produces a peak flow of around 2,000 m3 s-1, usually in late March or early April (Fig. 3.2). Big storms can raise the discharge to similar levels at other times ofyear, but typically the discharge decreases to 100-200m3 s-1 during the summer months.

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