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Watershed 18
Physical Characteristics
STREAM: Grady Branch
AREA: 13 ha
FIRST RECORD: 07/03/1936
NOTCH: 120 V-notch
ELEV. at WEIR: 726 m
MAX ELEVATION: 993 m
MAX DISCHARGE: 1.36 m3sec-1km-2
ASPECT: Northwest
Parameters from Swank and Crossly (1988)
Average Annual Nutrient (kg ha-1) and Water (cm) Budget:
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|
Input
|
Output
|
Net Difference
|
|
Water
|
206
|
119
|
+87
|
|
NO3-N
|
2.97
|
0.04
|
+2.93
|
|
NH4-N
|
1.97
|
0.03
|
+1.94
|
|
PO4-P
|
0.09
|
0.02
|
+0.07
|
|
SO4-S
|
10.72
|
1.64
|
+9.08
|
|
Cl
|
5.72
|
6.3
|
-0.58
|
|
K
|
1.98
|
4.93
|
-2.95
|
|
Na
|
3.56
|
10.31
|
-6.75
|
|
Ca
|
4
|
7.03
|
-3.03
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|
Mg
|
0.85
|
3.49
|
-2.64
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|
SiO2
|
0.62
|
83.69
|
-83.07
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Volume-Weighted Mean Annual Concentrations 1973-83:
NO-3-N = 0
NH+4-N = 0
PO3-4-N = 0
Cl- = 0.53
K+ = 0.41
Na+ = 0.86
Ca2+ = 0.59
Mg2+ = 0.29
SO2-4-S = 0.14
SiO2 = 7.01
Some Physiographic and Mean Hydrologic Characteristics:
Land Slope (%) = 52
Record Length (yr) = 45
Mean Annual Precipitation (cm) = 193.9
Mean Annual Runoff (cm) = 103.42
Precipitation Runoff (cm) = 90.48
Hursh's Runoff Coefficient = Mean Annual Runoff/Mean Annual Precipitation
= 0.54
Initial Flow Rate (l/s/km2) = 29.54
Quickflow Before Peak (cm) = 2.73
Quickflow After Peak (cm) = 7
Delayed Flow (cm) = 93.69
Storm Duration (hr) = 13.5
Time To Peak (hr) = 4.11
Absolute Peak (l/s/km2) = 79.97
Recession Time (hr) = 9.39
Mean Runoff Events/Year = 79
Response Factor: (Qflow Before Pk + Qflow After Pk) / Mean Annual
Precipitation = 0.05
Hursh's Storm Runoff Ratio: (Qflow Before Pk + Qflow After Pk)/Mean Annual
Runoff = 0.09
Summary of Treatments
Controls with mixed hardwoods stands remaining undisturbed since 1927.
Aquatic Research
Discharge for
WS18 and WS27 measured with 120 degree sharp-crested V-notch weirs:
- Watershed
18 daily stream discharge.
- Watershed
27 daily stream discharge.
Terrestrial Research
Microclimate (Gradient).
Nitrogen
Transformation (Gradient).
Litterfall
(Gradient) Group 1.
Litterfall
(Gradient) Group 2.
Litterfall
(Gradient) Group 3.
Litterfall
(Gradient) Group 4.
Litterfall
(Gradient) Group 5.
Litterfall
(Gradient) Group 6.
Litterfall
(Gradient) Group 7.
Dendrometer
Bands (Gradient).
Soil
Moisture (TDR Gradient).
Annual rates
of fine root appearance and disappearance (Gradient).
Seasonal
dynamics of fine root length (Gradient).
Fine root
length (Raw Data Gradient).
Root Mass
(Raw Data Gradient).
Canopy
Gradient Thrufall.
Canopy
Gradient Frass.
Soil
Chemistry along the canopy gradient.
Tree
population dynamics along environmental gradients.
Microclimate (Gap).
Dendrometer
Bands (Gap).
Soil
Moisture (TDR Gap).
Photosynthetic Active Radiation (PAR Gap). |