. Ecology of Buzzards Bay : an estuarine profile. Estuarine ecology -- Massachusetts Buzzards Bay (Bay); Ecology -- Massachusetts Buzzards Bay Watershed. l 1 1 1 1 1 1 1 1 1 i r- Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec. Jan Feb Mar Apr May Jun Jul Aug Sep 1970-1971 Fig. A. Precipitation and mean monthly discharge of the Westport River, normalized by its drainage area. B. Comparison of normalized discharge from 2 years of data from the Westport and Weweantic Rivers. From Signell (1987) inputs and discharges results primarily from strong seasonal shifts in recharge rates that are du
. Ecology of Buzzards Bay : an estuarine profile. Estuarine ecology -- Massachusetts Buzzards Bay (Bay); Ecology -- Massachusetts Buzzards Bay Watershed. l 1 1 1 1 1 1 1 1 1 i r- Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec. Jan Feb Mar Apr May Jun Jul Aug Sep 1970-1971 Fig. A. Precipitation and mean monthly discharge of the Westport River, normalized by its drainage area. B. Comparison of normalized discharge from 2 years of data from the Westport and Weweantic Rivers. From Signell (1987) inputs and discharges results primarily from strong seasonal shifts in recharge rates that are due to losses via evapotranspiration and to a lesser extent the stor- age of ice and snow during winter until spring melt. Annual return of rainwater within the watershed to the atmosphere is about 65% (45% recharge; LeBlanc et al. 1986). The integrated result of the cycles of precipitation, temperature, and evapo- transpiration is a distinct seasonal variation in water table elevation with resulting variations in discharge. Although river discharge data are limited, long- term measurements were conducted on the major river system, the Westport River (Fig. ), with smaller data sets available for the Weweantic River (cf. Signell 1987) and Red Brook (Moog 1987). The seasonality of river discharge is clear in the Westport and Weweantic rivers (Tig. ). Similar temporal variations caused by seasonal changes in hydraulic gradient were found in groundwater discharge into Buttermilk Bay (Weiskel 1991). The similar discharge rates per unit of water- shed for the Westport and Weweantic rivers over the same period (Fig. ) support the use of a generalized ratio of discharge/subwatershed area for each of the major rivers discharging to Buzzards Bay (Signell 1987). The ratio from the long-term Westport data is (m7s)/km:, similar to a study by Bue (1970) for a nearby Cape Cod River of (mVs)/km2. The bay-wide total freshwa- ter inflow estimated from this approach is 22
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