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Table Hy02: Results of Indicators of Hydrologic Alteration analysis for the Salt River

Table 5. Results of Indicators of Hydrologic Alteration analysis for the Salt River at New London, Missouri. Range of Variability Approach (RVA) targets are based on + or - 1 standard deviation of pre-dam means, except when targets fall outside of pre-dam range limits. When this occurred, the 25th (lower target) or 75th (upper target) percentiles were used. Streamflows in cubic feet per second. * indicate post-dam means falling outside of RVA targets.
Parameter Pre-Impact Mean Post-Impact Mean RVA Targets Percent of Years Outside of RVA Targets
Monthly Flow
October 1020 1415 29-2934 14
November 930 1861 42-2377 29
December* 755 2726 49-1828 36
January 1141 1380 65-2495 29
February 1812 1467 177-3447 7
March 2393 2910 439-4348 36
April 2947 2798 680-6035 36
May 2328 2734 382-5135 29
June 2529 2821 546-5214 36
July 1500 2218 189-4055 43
August 895 1333 166-2501 21
September 1053 1220 84-3284 14
Min/Max Flows
1-day minimum* 17 38 0-34 50
3-day minimum* 18 41 0.5-36 64
7-day minimum* 20 49 0.8-39 64
30-day minimum* 46 139 7-102 43
90-day minimum 165 375 27-381 29
1-day maximum* 28167 11879 14437-41897 71
3-day maximum* 24110 11307 11784-36436 50
7-day maximum 16029 10686 7554-24505 29
30-day maximum 7139 7885 317-24505  
90-day maximum 3918 5043 1819-6017 36
# of zero days 0.5 0 0-3 0
Base flow 0 0 0-0 43
Day of year minimum flow 263 278 239-287 64
maximum flow* 140 176 109-170 86
Low pulse count 6 8 3-9 64
Low pulse duration 11 6 5-18 79
High pulse count 7 6 4-11 43
High pulse duration* 3 6 2-4 71
low pulse threshold is 65 (25th percentile)
high pulse threshold is 5878 (+1 sd)
Rise rate 1352 759 614-2090 21
fall rate -596 -565 -934- -257 7
# of reversals* 84 155 72-96 93

Key Messages: 

Conservation pays by enriching our economy and quality of life.

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