ILLUSTRATIONS AND TABLES Figure Page 27. Graph of the minimum, average, and maximum monthly discharge of the Escambia River near Century, 1935-61 __ 46 28. Relation of daily chloride content in water in Escambia River at Chem- strand plant to streamflow at State Highway 4 near Century, October- December 1959 and October-December 1960 __ 48 29. Channel-bottom profile of Pond Creek 50 30- Low-flow frequency curves for Big Coldwater Creek near Milton, 1938-61 52 31. Graph of minimum, average, and maximum monthly discharge of Big Coldwater Creek near Milton, 1938-61 53 32. Channel-bottom profile of lower Blackwater River 54 33. Water levels in an artesian well and two nonartesian wells drilled into the sand-and-gravel aquifer in northern Escambia County and graph of monthly rainfall at Pensacola __ 60 34. Cross section showing geology and hydrology in northern Escambia County 61 35. Hydrograph of wells 037-645-1 and 032-648-1 ___ 65 36. Hydrographs of wells 031-716-1, 036-719-1, and 036-716-1 and graph of yearly rainfall at Pensacola _____67 37. Hydrographs of wells 024-715-1, 024-715-2, and 023-716-2 ..--- 69 :38. Hydrograph of well 021-709-8 and graph of the rainfall at Pensacola 71 39. Graph showing theoretical drawdowns in the vicinity of a well 76 40. Map of Escambia and Stanta Rosa counties showing mineral content of water from the sand-and-gravel aquifer -- 77 41. Map showing types of water from wells in the sand-and-gravel aquifer 78 42. Graphs showing chemical composition of water from wells in the sand- and-gravel aquifer from Molino to McDavid ------- 81 -3. Map of Escambia and Santa Rosa counties showing the amount of ground water used daily for industrial and public supplies during 1958 and 1962 ____ 84 44. Graph showing pumpage from the sand-an-gravel aquifer by the City of Pensacola, 1933-62 87 45. Cross section showing the decline of water levels in the vicinity of Cantonment ______--- 94 TABLES Table Page 1. Drainage areas and average flows of streams in Escambia and Santa Rosa counties, Florida ------ 97