effluent into the Tamiami Canal. The establishment of the proposed airfield would be another interest demanding lowered water tables.
Factors (5) and (6) are engineering economics problems that need not be discussed here.
Factor (7) may be enlarged upon somewhat. In planning a well field, the manner of spacing the wells and their distance apart must be considered. Elsewhere it probably would be the best plan to align the wells at right angles to the direction of flow of the ground water, in other words, parallel to the contours on the water table (see plate 5). In the Miami area, however, the water table gradients are so flat that it would make little difference how the wells are patterned or laid out. From a study of the characteristics of the cone of depression surrounding the present well field it. is believed that, were wells of similar capacity constructed in the new field, they should not be closer together than 750 feet, and 1,000 feet apart would be better. Whether the wells be laid out in the form of one or more long parallel rows, or in the form of a "y", and "x", a "v", or any other pattern, is a matter of engineering economics.