| Description |
xiii, 205 leaves : illustrations, maps, photographs (some colored) ; 29 cm |
| Summary |
"A hydrologic and dye trace study of the Welch Spring and its recharge area in south central Missouri indicates that the continuous average discharge for the spring is 229 ft³/sec. This is significantly higher than previous estimates of 121 ft³/sec, 140 ft³/sec, 175 ft³/sec, and 180 ft³/sec. All previous estimates were made prior to 1985 when much of the spring's discharge was likely not measured because of seepage through alluvial gravel. The recharge area for the spring is estimated to be 213-mi². Dye trace results confirm inter-basin transfer of groundwater from the Meramec River basin to the Current River basin. Dye trace results also indicate that the recharge area does not include an area west of Welch Spring as proposed by one previous researcher. Pre-November 1985 instantaneous discharge measurements for Welch Spring indicate an average discharge of 174.5 ft³/sec. Post-November 1985 instantaneous discharge measurements indicate an average discharge of 219ft³/sec. As part of this conclusion, it is assumed that the post-1985 measurements are more accurate because no discharge was lost through alluvial gravel. A comparison of an instantaneous average discharge to a continuous average discharge for Big and Greer Springs indicates that the instantaneous average underestimates the true (continuous) average by four to five percent. Applying this correction factor to the post-1985 average discharge for Welch Spring indicates that the true (continuous) average discharge for Welch Spring is 219*1/0. 9585 or 229 ft³/sec"--Abstract, leaf iii. |
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