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Table 22. Nutrient and suspended-sediment monthly load and runoff summary statistics (sum, median, minimum, and maximum), percent change in sums between stations, and monthly median units/yields between stations for period of comparison (water years 1991-98) for three LTIMP sampling stations in the Upper Truckee River watershed, South Lake Tahoe area, Lake Tahoe Basin, Nevada
[Abbreviations: acre-ft, acre-feet; kg, kilogram; kg/km2, kilogram per square kilometer; kg/mo, kilogram per month; acre-ft/ mi2, acre-feet per square mile. Symbol: --, not applicable]
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|
Average annual runoff (acre-ft) |
Dissolved nitrite + nitrate (NO2 + NO3) nitrogen (kg/mo) |
Dissolved ammonia (NH4) nitrogen (kg/mo) |
Total nitrogen (kg/mo) |
Soluble reactive phosphorus (kg/mo) |
Total phosphorus (kg/mo) |
Biologically reactive iron (kg/mo) |
Suspended sediment (kg/mo) |
|---|---|---|---|---|---|---|---|---|
|
Upper Truckee River at South Lake Tahoe |
||||||||
|
Sum |
-- |
11,800 | 2,100 | 173,000 | 4,860 | 34,700 | 515,000 | 35,200,000 |
|
Median |
74,200 (average) |
53.0 | 10.0 | 565 | 16.8 | 94.8 | 1,280 | 55,100 |
|
Maximum |
-- |
848 | 108 | 13,100 | 392 | 3,160 | 64,700 | 7,670,000 |
|
Minimum |
-- |
1.08 | .17 | 14.3 | .46 | 1.97 | 27.8 | 227 |
|
Percent change in sum |
12 |
37 |
48 |
39 |
42 |
47 |
60 |
68 |
|
Yield (kg/km2) |
-- |
.38 |
.07 |
4.04 |
.12 |
.68 |
9.14 |
394 |
|
Unit runoff (acre-ft/mi2) |
1,370 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
|
Upper Truckee River at Highway 50 above Meyers |
||||||||
|
Sum |
-- |
7,470 | 1,090 | 106,000 | 2,840 | 18,300 | 206,000 | 11,300,000 |
|
Median |
65,400 (average) |
27.2 | 3.86 | 282 | 10.1 | 45.3 | 462 | 12,300 |
|
Maximum |
-- |
503 | 83.2 | 10,000 | 261 | 2,070 | 22,000 | 1,550,000 |
|
Minimum |
-- |
1.41 | .25 | 16.4 | 1.00 | 3.58 | 35.3 | 153 |
|
Percent change in sum |
49 |
41 |
31 |
39 |
18 |
29 |
27 |
24 |
|
Yield (kg/km2) |
-- |
.27 |
.04 |
2.76 |
.10 |
.44 |
4.53 |
121 |
|
Unit runoff (acre-ft/mi2) |
1,660 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
|
Upper Truckee River at South Upper Truckee Road |
||||||||
|
Sum |
-- |
2,630 | 441 | 38,900 | 1,940 | 8,390 | 68,900 | 2,730,000 |
|
Median |
29,200 (average) |
11.6 | 1.63 | 105 | 7.00 | 19.0 | 131 | 2,510 |
|
Maximum |
-- |
168 | 44.6 | 3,350 | 152 | 896 | 7,340 | 352,000 |
|
Minimum |
-- |
1.83 | .14 | 8.63 | 1.45 | 3.66 | 12.0 | 97.2 |
|
Percent change in sum |
39 |
22 | 21 | 22 | 40 | 24 | 13 | 8 |
|
Yield (kg/km2) |
-- |
.32 | .04 | 2.85 | .19 | .52 | 3.56 | 68.2 |
|
Unit runoff (acre-ft/mi2) |
2,060 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |