| OCR Text |
Show 65 thousand acre- feet additional annual depletion in inflow.) Fluctuation in the water level of the Lake causes large changes in the surface area because the slope of the Lake bed is generally less than a 1: 500 ratio. The Lake covered 2,185 square miles at its high point and only 915 square miles at its low point. ( Table 6 shows the relationship of Lake level to surface area and Lake volume.) The surface of the Lake is also periodically affected by the severe storms from the northwest or the south. These storms cause wind tides ( sieches) which may increase the level of the Lake more than one foot and move the shore line back as much as two miles. TABLE 6 GREAT SALT LAKE: WATER LEVEL, SURFACE AREA, VOLUME RELATIONSHIPS Lake Level Area Volume ( Feet Above ( Square Area Volume Change Sea Level) Miles) ( Acres) ( Acre- Feet) ( Acre- Feet) 4,167 0 0 0 0 4,170 180 115,300 288,320 288,320 4,175 423 270,550 1,253,000 964,680 4,180 626 400,970 2,931,810 1,678,810 4,185 770 492,700 5,166,050 2,234,240 4,190 884 565,600 7,811,890 2,645,840 4,195 1,096 701,300 10,979,190 3,167,300 4,200 1,680 1 ,075,380 15,420,920 4,441,730 4,205 2,016 1 ,290,100 12,334,620 5,913,700 4,210 2,122 1 ,358,200 27,955,400 6,620,780 Source: Utah Geological and Mineralogical Survey, Report of Investigation No. 3 ( Cohenour, Eardley, Hewitt and Bradford, 1963). |
