Twenty-nine sites on streams flowing to Lewisville Lake in north-central Texas were sampled in each of two synoptic (same day) water-quality surveys. The first survey was performed in March 1984 under relatively low-flow conditions and the second was performed in March 1985 under somewhat higher flow conditions. Data are presented for instantaneous measurements of discharge, specific conductance, pH, water temperature, dissolved oxygen, total organic carbon, nitrite-plus-nitrate nitrogen, ammonium-plus-organic nitrogen, total nitrogen, and total phosphorus. Area-based instantaneous yields for discharge, total nitrogen, and total phosphorus were calculated and are displayed graphically showing the rank of each site and the areal distribution of ranks. (USGS)
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USGS Numbered Series
Physical and chemical data from two water-quality surveys of streams in the Lewisville Lake watershed, north-central Texas, 1984 and 1985
4 maps on 2 sheets ;sheets 66 x 92 cm., folded in envelope 31 x 23 cm.