. Bulletin. Forests and forestry -- United States. 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
. Bulletin. Forests and forestry -- United States. 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 Fig. 63.—Cavern .spring. This kind of spring is found frequently in limestone formations, and since the waters of such often come from great distances from above their discharge at the sur- face, they are usually of very cold and even temperature; they are ;ipt to run low "when the soil is frozen and when precipitation is small; and their discharge is more or less intermittent. The (tbstruction of the old and of a new outlet by a fall of rocks at A' and V, and the widening of a fm-merly insignificant fissure at- or t, may reduce the flow or 8toi» the original spring entirely, opening a new one in an entirely difl'ereut part of the 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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