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Table 23. 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 1992-98) for three LTIMP sampling stations in the Ward Creek watershed, Tahoe City and Meeks Bay 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]
|
|
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) |
|---|---|---|---|---|---|---|---|---|
|
Ward Creek at State Highway 89 |
||||||||
|
Sum |
-- |
2,890 | 335 | 36,900 | 1,350 | 11,000 | 260,000 | 16,000,000 |
|
Median |
22,100 (average) |
5.46 | 1.26 | 77.5 | 5.03 | 21.7 | 122 | 7,130 |
|
Maximum |
-- |
608 | 25.5 | 5,540 | 108 | 2,240 | 127,000 | 4,470,000 |
|
Minimum |
-- |
.02 | .01 | .23 | .03 | .09 | .30 | 20.9 |
|
Percent change in sum |
5 |
17 | -3 | 12 | 9 | 11 | 40 | 56 |
|
Yield (kg/km2) |
-- |
.22 | .05 | 3.08 | .20 | .86 | 4.84 | 290 |
|
Unit runoff (acre-ft/mi2) |
2,270 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
|
Ward Creek at Stanford Rock Crossing |
||||||||
|
Sum |
-- |
2,410 | 347 | 32,600 | 1,220 | 9,810 | 155,000 | 7,030,000 |
|
Median |
21,000 (average) |
7.07 | 1.75 | 65.0 | 4.48 | 16.4 | 120 | 10,800 |
|
Maximum |
-- |
217 | 23.8 | 4,730 | 92.2 | 2,160 | 81,800 | 614,000 |
|
Minimum |
-- |
.12 | .08 | 1.76 | .51 | 1.33 | 12.6 | 387 |
|
Percent change in sum |
35 |
8 | 30 | 46 | 48 | 44 | 41 | 19 |
|
Yield (kg/km2) |
-- |
.30 | .08 | 2.80 | .19 | .71 | 5.17 | 466 |
|
Unit runoff (acre-ft/mi2) |
2,340 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
|
Ward Creek below confluence |
||||||||
|
Sum |
-- |
2,170 | 242 | 15,600 | 577 | 4,970 | 48,400 | 3,970,000 |
|
Median |
13,200 (average) |
6.39 | 1.04 | 34.5 | 1.94 | 8.78 | 28.3 | 5,500 |
|
Maximum |
-- |
196 | 19.1 | 1,410 | 46.1 | 558 | 16,400 | 521,000 |
|
Minimum |
-- |
.01 | .01 | .07 | .01 | .03 | .05 | 206 |
|
Percent change in sum |
60 |
75 | 70 | 42 | 43 | 45 | 19 | 25 |
|
Yield (kg/km2) |
-- |
.50 | .08 | 2.70 | .15 | .69 | 2.21 | 430 |
|
Unit runoff (acre-ft/mi2) |
2,660 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |