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AVERAGE ANNUAL SEDIMENT AND NUTRIENT LOADS PHASE II OF THE NON-TIDAL ANACOSTIA MODEL Interstate Commission on the Potomac River Basin March 8, 2004
AVERAGE ANNUAL SEDIMENT AND NUTRIENT LOADS
PHASE II OFTHE NON-TIDAL ANACOSTIA MODEL
Interstate Commission on the Potomac River Basin
March 8, 2004
MODEL SEGMENTATION
PHASE I--PHASE II COMPARISON
PHASE I PHASE II
Simulation Period 1988-1995 1996-2000
Land Use MOP 1990 PG County 2000
Montgomery Co.
Calibration Data CAMP
OWML (NW Only)
LTCP
(1999-2000)
Calibration Target STORM CONC. STORM LOADS
TARGET STORMWATER CONCENTRATIONS
(mg/l)
Residential Commercial Industrial
BOD5 16.85 16.72 16.07
NO3 0.595 0.589 0.728
TKN 1.52 2.81 1.14
TP 0.408 0.193 0.249
TSS 118 123 169
SIMULATED AVERAGE ANNUAL SEDIMENT LOADS (tons/yr)
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
Co
mm
ercia
l
Co
rn
Fo
rest
Ha
y
Ind
ustria
l
LD
R
HD
R
Pa
sture
Ed
ge
-of-S
trea
m
PS
In-stre
am
Tota
l
NE NW LBC
SIMULATED AVERAGE ANNUAL BOD LOADS (lbs/yr)
-400,000
-200,000
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
Com
mercial
Corn
Forest
Hay
Industrial
LDR
HD
R
Pasture
Edge-of-S
tream
PS
In-stream
Total
NE NW LBC
SIMULATED AVERAGE ANNUAL TP LOADS (lbs/yr)
0
10,000
20,000
30,000
40,000
50,000
60,000
Com
mercial
Corn
Forest
Hay
Industrial
LDR
HD
R
Pasture
Edge-of-S
tream
PS
In-stream
Total
NE NW LBC
SIMULATED AVERAGE ANNUAL AMMONIA LOADS (lbs/yr)
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
Com
mercial
Corn
Forest
Hay
Industrial
LDR
HD
R
Pasture
Edge-of-S
tream
PS
In-stream
Total
NE NW LBC
SIMULATED AVERAGE ANNUAL NITRATE LOADS (lbs/yr)
-40,000
-20,000
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
180,000
Com
mercial
Corn
Forest
Hay
Industrial
LDR
HD
R
Pasture
Edge-of-S
tream
PS
In-stream
Total
NE NW LBC
SIMULATED AVERAGE ANNUAL ORGANIC NITROGEN LOADS (lbs/yr)
0
50,000
100,000
150,000
200,000
250,000
Com
mercial
Corn
Forest
Hay
Industrial
LDR
HD
R
Pasture
Edge-of-S
tream
PS
In-stream
Total
NE NW LBC
ESTIMATED AVERAGE ANNUAL SEDIMENT LOADS (tons/yr)
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
CBP Phase 4.3 TAM/WASP Phase I Phase II Model
ESTIMATED AVERAGE ANNUAL BOD LOADS (lbs/yr)
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
TAM/WASP Phase I Phase II Model
NW BRANCH BOD STORM LOADS (lbs)SIMULATED VS. OBSERVED
0
10,000
20,000
30,000
40,000
50,000
60,000
0 10,000 20,000 30,000 40,000 50,000 60,000
Model
Ob
serv
ed
ESTIMATED AVERAGE ANNUAL NUTRIENT LOADS (lbs/yr)
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
TP NH4 NO3 ORN TN
CBP Phase 4.3 TAM/WASP Phase I Phase II Model
SIMULATED LOAD AS PERCENT OBSERVED LOAD
ORIGINAL
PHASE I
PHASE I
PHASE II
PARAMETERS
TSS 337% 142%
TP 70% 47%
TN 625% 37%
OBSERVED SEDIMENT CONCENTRATIONS
0
100
200
300
400
500
600
700
800
900
1000
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Percent Excedence
TS
S (
mg
/l)
Phase 1 Phase 2
OBSERVED TP CONCENTRATIONS
0
0.2
0.4
0.6
0.8
1
1.2
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Percent Excedence
TP
(m
g/l)
Phase 1 Phase 2
OBSERVED TKN CONCENTRATIONS
0
0.2
0.4
0.6
0.8
1
1.2
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Percent Excedence
TP
(m
g/l)
Phase 1 Phase 2
THE REPORT IS AVAILABLE AT:
http://www.potomacriver.org/info_center/publications.htm
NEXT STEPS
CONTACTS
Ross Mandel, ICPRB
Rou Shi, ICPRB
