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

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