The Nutrient Content of Stream Sediments
The Peculiarities of Perviousness
Feb. 12-13, 2014
Measuring TSS and nutrient loads
TSS and TP vs. Flow Sample Results
Regression
10000
1000
Typical flow vs. TSS 100
10
1 0.1
1
0.1
1
10
Sample Results
100
Regression
1000
10000
Typical flow vs. TP
1000
100
10
1 10
100
1000
Typical TSS vs. TP relationship
Morgan Run Storm Samples 1983 to 2001 Sample Results
Regression
10
Total Phosphorus (mg/L)
1
0.1
0.01
0.001 1
10
100 Suspended Solids (mg/L)
1000
10000
Typical Nitrate vs. Flow
Morgan Run (MOR0040) Storm & Baseline Samples 1982-2005 7
Nitrate Nitrogen (mg/L)
6
5
4
3
2
1
0 0.1
1
10
100
Flow (CFS)
1000
10000
Geomorphic monitoring
Overlay CX 7 as Surveyed 12/2002 and 4/2004
284
282
Vertical (Elevation )
280
Adj.CX A Elev.
278
Bnkf ull A Elev.CX B 276
Bnkf ull B
274
272
270 0
20
40 Horizontal
60
80
Predicting bank erosion from geomorphic measurements
Nutrient content of stream soils Total Phosphorus mg/kg
450 400 350 300 250
Bank Soil
200
Sediment
150 100 50 0
Biddison Moores Maidens Powder Stony Run1 Run2 Choice Mill 4 Run 5 3
Western Run 6
Stream channel nutrient data
Table 5. TN and TP Concentrations in Sediments in Different Parts of the Urban Landscape1 Location
Mean TP 0.439
Streamba nk Sediments
1 all
TP Range
Mean TN TN Range
Location
Reference
0.190.90
--
MD
BDPW, 2006
MD
Stewart, 2012 Land Studies, 2005
1.78
--
5.41
1.43
0.931.87
4.4
2.8-6.8
PA
1.05
0.681.92
2.28
0.834.32
PA
2
Walter et al., 2007 2,4
units are lb/ton the Pennsylvania data on streambank sediments were in rural/agricultural subwatersheds 3 catch basin values are for sediment only, excluding leaves 4 median TN and TP values are reported 2
Reconciling the two methods
Total Suspended Solids Yearly Load Estimate (pounds/acre/year)
Compare Total Suspended Solids Load Estimates by different methods and lancovers 3,500
3,000
2,500
?
2,000
1,500
1,000
500
0
Spring Branch Spring Branch 7 Stony Run Before Yrs After Geomorphic Restoration Restoration
Stony Run WQ Moores Run at Beaver Run Beaver Dam Monitoring Radecke Average 1983- Average 1983Average 2005Average 5 1990 1990 2007 Years SWMM
