. Bulletin. Forests and forestry -- United States. SPRINGS. 155 tlie Avater to tnh along its upper plane until the formation somewhere comes to the surface and with it the collected water of the spring. These conditions are illustrated in the aeccompanyiug cut (Fig. 62), in which h c d of represents the upper fissured formations through which the rain and suow waters penetrate to the lower imper- meable strata below the line bf, necessarily gravitating to point/, where the oppor- tunity for discharging as a spring exists; a smaller spring might occur at c. Such conditions exist where lime or d
. Bulletin. Forests and forestry -- United States. SPRINGS. 155 tlie Avater to tnh along its upper plane until the formation somewhere comes to the surface and with it the collected water of the spring. These conditions are illustrated in the aeccompanyiug cut (Fig. 62), in which h c d of represents the upper fissured formations through which the rain and suow waters penetrate to the lower imper- meable strata below the line bf, necessarily gravitating to point/, where the oppor- tunity for discharging as a spring exists; a smaller spring might occur at c. Such conditions exist where lime or dolomite rocks overlie hard sandstones, compact clay. Fig. 62,—Fissure spring. slates, or clay beds. These springs, as a rule, are much less dependent on the changes of precipitation and temperature; they are mostly continuous and even in their flow and their temperature. The third class of the running springs may properly be called "cavern" springs, from the fact that while their waters are drained like those of the second class, they aie first c(dlected in some subterranean basins or caverns, and appear on the surface as overflow of these basius. In the accompanying figure (63), a h c is the catchment basin, from which the vari- ous fissures conduct the water to A, overflowing at X into B, and from there over- flowing and appearing at the surface at Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Division of Forestry. Washington : G. P. O.
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