Observations on the Ground Waters of Rio Grande Valley (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Observations on the Ground Waters of Rio Grande Valley

An investigation of the underfiow of the Rio Grande was begun in the latter part of August, 1904, at the narrows of the Rio Grande, a few miles above El Paso, Tex., where the stream flows through a narrow gorge Of limestone. At this place is the site of the proposed mexican-american international dam. At the surface of the water the distance between the walls of the gorge is less than 400 feet. The dam site has been investigated by the International (water) Boundary Commission, organized by the joint action of the American and Mexi can Governments, and maps and reports concerning the proposed dam will be found in the Proceedings of the International (water) Bound ary Commission, vol. 2, page 277.

A brief reconnaissance at the site of the proposed international dam indicated that there could be, no underflow of any magnitude at this point. The distance between the walls of the gorge is less than 400 feet, and the test borings made by the Mexican commission in 1897 seemed to indicate that the maximum depth to bed rock is 86 feet. A cross section of the gorge, based upon the Mexican borings, is shown in fig. 2. In this diagram the vertical and horizontal scale are the same. A cross section of less than square feet could not trans mit a large volume of ground water even if other conditions were favorable. The highest velocity ever determined for ground water is about 100 feet in twenty-four hours, and assuming this maximum velocity at the above cross section, and a porosity of one-third in the water-bearing sands and gravel, the daily discharge Would be cubic feet, or 151} cubic feet per second. The gradient of the water plane at the narrows is but 3555 feet to the mile, and all other indica tions point to a low rather than a high velocity.

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