OCR Text |
Show DRAINAGE OF WET LAND AREAS. The drainage of the vast swamn areas of the country approximately 70,000.000 acres is a matter of water , engineering and the study of run-off is of first consideration In connection ' with any drainage project. Drained swamp lands become generally tho most fertile of our agricultural areas and the reclamation of the swamps of the United States should add from $2,000,000,000 to 1.000.000,000 to the nation's assets. Finallv, in the matter of flood prevention pre-vention " a thorough knowledge of stream flow both in the contributing areas and along the great lowland rivers, Is the first necessity. The flood damage In the United States is estimated esti-mated to be in excess of $100 000-000 000-000 annually eGological Survey |