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TABLES <br />P-021 <br />1 Climatic trends at four locations along the lower Colorado River.,. 8 <br />2 Monthly water flow at three stations along the lower Colorado <br /> River ........................................................... 33 <br />3 Yearly sediment load through six stations along the lower <br /> Colorado River .................................................. 35 <br />4 Average water use in the Colorado River basin for 1976-1980....... 39 <br />5 Colorado River depletion projections .............................. 40 <br />6 Salinity projections for the Colorado River basin ................. 44 <br />7 Dissolved oxygen concentrations for 30 sampling periods on the <br /> mainstream Colorado River, 1974-75... 0 ... 0.006.0 ... 00.0e..06.6.. 46 <br />8 Concentrations of phosphate-phosphorus and nitrate-nitrogen in <br /> waters from the lower Colorado River, 1974-76 ................... 48 <br />9 Concentrations of chlorophyll a .In water samples from the lower <br /> Colorado River, 1974-76 ......................................... 50 <br />10 Planktonic biota in three lakes on the Colorado River ............. 52 <br />11 Major zooplankton, March 20-26, 1970 .............................. 52 <br />12 Colorado River water chemistry .................................... 53 <br />13 Lower Colorado River selenium data, National Contamination <br /> Biomonitoring Program, 1972-1980 ................................ 53 <br />14 Lower Colorado River selenium data for carp, double-crested <br /> cormorant (Phalacrocorax auritus), Yuma clapper rail, and <br /> holly-leaved water nymph (NaJas marina) ......................... 54 <br />15 Major agricultural areas on or near the lower Colorado River...... 57 <br />16 Crops grown on the Colorado River-Indian Reservation in 1983 and <br /> Palo Verde Irrigation District in 1986 .......................... 58 <br />17 Insecticide and herbicide application on various crop types....... 62 <br />xii