Areas showing depths to water table: Shades of purple and gray; if possible the shades showing the areas of least depth should be darkest and the shades should grade from those to lighter tints.
Contours of water table, or contours on water-bearing formations: Gray or purple curves or lines.
Areas of artesian flow: Blue flat tint, or fine ruling in blue. Depth to water-bearing formations: Gradation of a single color or of two related colors from dark for shallow depths to light for greater depths.
Nonflowing artesian areas (pumped wells): Green flat tint, or fine ruling in green. Depth to water-bearing formations shown by gradation of tint if possible from dark for shallow depths to light for greater depths.
Head of artesian water: Blue curves or lines.
Areas that discharge ground water: Blue flat tint, or fine ruling in blue.
Areas irrigated with ground water: Green flat tint, or fine ruling in green.
Well, character not indicated.
Well, nonflowing.
Well, flowing.
Well, unsuccessful or dry.
Well, nonflowing, with pumping plant.
Well, flowing, with pumping plant.
Springs.
Spring, thermal.
Spring, mineral.