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Chapter 2
BMP Selection
BMP Category Sample Type
Bioretention
(w/Underdrain)
Grass Buffer
Grass Swale
Detention Basin
(aboveground
extended det.)
Media Filters
(various types)
Retention Pond
(aboveground
wet pond)
Wetland Basin
Permeable
Pavement**
Inflow
Outflow
Inflow
Outflow
Inflow
Outflow
Inflow
Outflow
Inflow
Outflow
Inflow
Outflow
Inflow
Outflow
Inflow
Outflow
Arsenic,
Diss.
Arsenic,
Total
Cadmium,
Diss.
Cadmium,
Total
Chromium,
Diss.
Metals (micrograms/liter)
Chromium,
Total
Copper,
Diss.
NA NC NC NC NC NC NC 19.5 NC NC NC NC NC 68.0
(15.3-35.8, n= 3) (51-68.5, n= 5)
NA NC NC NC NC NC NC 10.0 NC NC NC NC NC 8.5
(7.3-16.8, n= 3) (5.0-35.0, n= 5)
0.8 1.1 0.2 0.4 2.4 4.9 12.9 21.2 0.9 11.0 2.9 4.8 37.8 100.5
(0.5-1.2, n= 12) (0.9-2.3, n= 12) (0.1-0.2, n= 12) (0.3-0.8, n= 12) (1.1-4.5, n= 12) (2.9-7.4, n= 13) (6.8-17.3, n= 12) (15.0-41.0, n= 13) (0.5-2.0, n= 12) (6-35, n= 13) (1.1-3.2, n= 12) (3.4-8.4, n= 12) (12.8-70, n= 12) (53.0-245.0, n= 13)
1.2 2.0 0.1 0.2 2.3 2.9 7.1 8.3 0.5 3.2 2.1 2.6 19.8 25.5
(0.5-2.4, n= 12) (0.7-3.0, n= 12) (0.1-0.2, n= 12) (0.1-0.2, n= 12) (1.0-3.8, n= 12) (2.0-5.5, n= 13) (4.8-11.6, n= 12) (6.4-12.5, n= 13) (0.5-1.3, n= 12) (1.8-6.0, n= 13) (2.0-2.3, n= 12) (2.2-3.2, n= 12) (10.7-24.3, n= 12) (15.0-57.9, n= 13)
0.6 1.7 0.3 0.5 2.2 6.1 10.6 33.0 1.4 21.6 5.1 8.7 40.3 149.5
(0.5-2.2, n= 9) (1.6-2.7, n= 9) (0.1-0.4, n= 13) (0.4-0.9, n= 14) (1.1-3.3, n= 7) (3.6-8.3, n= 7) (8.1-15.0, n= 13) (26-34, n= 13) (0.6-6.7, n= 13) (12.5-46.4, n= 14) (4.5-6.6, n= 6) (7-12.5, n= 6) (35.3-109.0, n= 13) (43.8-244.3, n= 15)
0.6 1.2 0.2 0.3 1.1 3.5 8.6 14.0 1.0 10.5 2.0 4.0 22.6 55.0
(0.6-1.2, n= 8) (0.9-1.7, n= 8) (0.1-0.2, n= 12) (0.2-0.4, n= 13) (1.0-3.0, n= 6) (1.7-5.0, n= 6) (5.5-9.7, n= 13) (6.7-18.5, n= 17) (0.5-4.1, n= 13) (1.7-12.0, n= 18) (2.0-2.3, n= 5) (3.1-4.5, n= 5) (20.1-33.2, n= 13) (20.6-65.4, n= 19)
1.1 2.1 0.3 0.6 2.6 5.6 5.8 10.0 1.0 10.0 2.9 6.3 16.4 125.0
(0.9-1.2, n= 5) (1.3-2.6, n= 6) (0.2-0.4, n= 8) (0.3-1.2, n= 11) (2.0-3.2, n= 3) (5.0-6.5, n= 6) (2.6-11.8, n= 8) (4.8-33.5, n= 11) (0.5-1.4, n= 8) (1.5-41.0, n= 11) (1.9-3.9, n= 4) (5-9.4, n= 5) (6.1-53.5, n= 8) (21.5-225.3, n= 11)
1.2 1.7 0.3 0.4 1.9 2.9 9.0 11.0 1.0 9.5 3.1 4.3 19.0 48.5
(0.9-1.2, n= 5) (1.1-1.9, n= 6) (0.2-0.4, n= 9) (0.2-0.6, n= 12) (1.7-3.0, n= 4) (1.9-3.8, n= 6) (3.0-13.0, n= 9) (6.2-20.1, n= 12) (0.5-1.3, n= 9) (1.3-18.6, n= 12) (2.0-3.2, n= 5) (3.2-5.4, n= 6) (7.8-54.0, n= 9) (19.1-94.0, n= 13)
0.7 1.1 0.2 0.4 1.0 2.1 6.2 13.5 1.1 9.0 2.0 3.9 42.7 86.0
(0.5-1.1, n= 12) (0.6-1.6, n= 12) (0.2-0.2, n= 14) (0.2-1.0, n= 17) (1.0-1.0, n= 13) (1.4-4.0, n= 13) (5.4-7.4, n= 13) (8.8-16.4, n= 18) (1.0-2.0, n= 14) (5.3-22.0, n= 17) (2.0-2.7, n= 13) (3.3-4.8, n= 13) (28.5-79.2, n= 14) (51.8-106.0, n= 19)
0.7 1.1 0.2 0.2 1.0 1.0 5.8 7.3 1.0 1.6 2.0 2.9 12.5 20.0
(0.6-1.1, n= 12) (0.7-1.6, n= 12) (0.2-0.2, n= 13) (0.1-0.7, n= 17) (1.0-1.0, n= 13) (1.0-1.9, n= 13) (3.1-8.3, n= 13) (4.3-9.6, n= 18) (1.0-1.0, n= 13) (1.0-4.4, n= 17) (2.0-2.6, n= 13) (2.0-3.9, n= 13) (6.7-49.0, n= 13) (8.6-35.0, n= 19)
NC 1.0 0.2 1.0 5.9 5.0 7.0 6.3 2.0 9.7 10.0 6.5 30.0 51.8
(1.0-1.4, n= 3) (0.2-0.4, n= 3) (0.3-2.6, n= 20) (1.6-10.0, n= 4) (3.0-7.4, n= 12) (6.0-9.5, n= 7) (4.3-10.6, n= 26) (1.0-5.1.0, n= 11) (4-28, n= 33) (6.2-10.0, n= 3) (3.6-9, n= 8) (15.5-42.6, n= 8) (43.9-78.1, n= 32)
NC 1.0 0.2 0.4 5.5 2.2 5.0 5.4 1.2 4.7 10.0 2.5 12.5 26.0
(0.8-1.0, n= 3) (0.2-0.4, n= 3) (0.2-2.5, n= 20) (1.0-10.0, n= 4) (1.4-5.3, n= 12) (4.7-5.8, n= 7) (3.0-6.2, n= 26) (1.0-4.9, n= 12) (1.6-10.0, n= 33) (7.2-10.0, n= 3) (2.0-5.5, n= 9) (9.4-28.6, n= 8) (12.0-37.0, n= 33)
NA NA NC 0.3 NA NA NC 10.5 NC 16.0 NA NA NC 51.0
(0.3-0.4, n= 3) (4.3-15.9, n= 4) (4.0-23.8, n= 4) (43.9-120.8, n= 7)
NA NA 0.5 0.3 NA NA 5.0 4.5 1.0 1.0 NA NA 11.0 15.0
(0.3-0.5, n= 3) (0.1-0.5, n= 5) (5.0-5.7, n= 3) (3.3-5.0, n= 6) (0.8-1.0, n= 3) (1.0-2.5, n= 6) (11.0-13.1, n= 3) (5.0-28.9, n= 9)
NA NC NC NA NC NC 5.0 7.0 0.1 2.5 NC NC 25.0 50.0
(2.5-6.4, n =3) (4.5-19.4, n = 3) (0.03-0.3, n = 3) (1.3-15.1, n = 3) (19.0-27.5, n = 3) (45.0-51.0, n = 5)
NA NC NC 0.3 NC NC 6.2 9.0 0.3 2.5 NC NC 14.6 22.0
(0.3-0.4, n =3) (4.5-6.4, n =4) (3.0-14.7, n = 5) (0.04-0.5, n = 4) (1.3-9.5, n = 7) (13.5-16.0, n = 4) (20.0-31.6, n = 7)
Copper,
Total
Lead,
Diss.
Lead,
Total
Nickel,
Diss.
Nickel,
Total
Zinc,
Diss.
Zinc,
Total
Table Key
Sample Type Analyte
Inflow
Outflow
Table Notes:
52.3
(50-63.3, n= 14)
22.3
Description
= Median inflow value
= Interquartile range, sample size
= Median outflow value
(15-28.3, n= 14) = Interquartile range, sample size
NA = Not available; studies containing 3 or more storms not available.
NC = Not calculated because fewer than 3 BMP studies for this category.
Interquartile Range = 25th percentile to 75th percentile values, calculated in Excel, which uses linear interpolation to calculate percentiles. For small sample sizes (particularly n