. Bulletin . the forests were more of a hindrance tothe work than otherwise, for they formed a thick jungle throughwhich many survey lines had to be cut and clearings made for roads,trails, reservoirs, and town sites. STREAMS. The heavy precipitation is evidence that the country must bewell watered. The Chagres, which flows for a part of its coursethrough the Canal Zone, is the cliief stream (see PI. IV). It has arelatively large catchment basin, the slopes of which are locallysteep; hence during heavy rains the volume of its flow is vastlyincreased, only to shrink greatly during the dry seaso
. Bulletin . the forests were more of a hindrance tothe work than otherwise, for they formed a thick jungle throughwhich many survey lines had to be cut and clearings made for roads,trails, reservoirs, and town sites. STREAMS. The heavy precipitation is evidence that the country must bewell watered. The Chagres, which flows for a part of its coursethrough the Canal Zone, is the cliief stream (see PI. IV). It has arelatively large catchment basin, the slopes of which are locallysteep; hence during heavy rains the volume of its flow is vastlyincreased, only to shrink greatly during the dry season. Tricklingstreams swell into destructive torrents after long and heavy percentage of absorption during the wet season is relativelysmall because the covering of porous soil, especially on the higherland and steep slopes, is very thin, and most of the rocks, exceptthe river alluvium and gravels, the conglomerates, and sandstones,are exceedingly fine grained and have relatively little pore space or. DEPARTMENT OF THE INTERIOR BUREAU OF MINESNNING, ACTING Di BULLETINSS PLATE IV
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