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Show Waddell and Fields- Model for Evaluating the Effects of Dikes on the Water and Salt Balance of Great Salt Lake 5 113° 00' 112° 30' 41° 30' 41° 00' 112 00' The lines of equal average annual precipitation are based on empirical relationships developed for control points in the general area around Great Salt Lake. They do not reflect any adjustment based on personal judgment of the effects of variation that might be caused by ocal variations of altitude. • OGDEN SALT LAKE CITY EXPLANATION Lines of equal average annual - 12 precipitation, interval 1 inch ( 25 millimetres) Proposed dike 8 Numbers show diking options ( see text) - I- 10 10 _ L_ - t 20 Kilometres 20 Miles Base from U. S. Geological Survey state base map, scale 1: 500,000, 1959 Figure 3. Map showing average annual precipitation on Great Salt Lake, 1931- 73. the parameters in the water budget. By adopting a period from the past for which the parameters can be estimated, a data base was developed for use in the model. A data base for 1931- 73 was developed for the model. This was the longest period for which adequate data were available upon which to estimate the parameters within the budget equation. The period also covers two long- term cycles in which the water surface either rose or fell for several years ( fig. 1). A time period ( T) of 1 month was adopted, which means that all parameters in the water budget had to be estimated for each month of the period 1931- 73. |