| Table
2. Pollutant Concentrations by Land Use: Total Phosphorus (mg/l) |
|
Land
Use |
|
|
Source
|
Residential |
Commercial |
Roadway |
Industrial |
Notes |
| Schueler,
1987 mean |
0.26 |
- |
0.59 |
- |
These
values are taken from a Washington DC NURP study in 1980-81. At least 27
storm events were sampled at multiple sites within the specified land use. |
| Gibb
et al., 1991 mean |
0.33 |
- |
0.59 |
- |
These
values represent recommended estimates for planning purposes and are based
on analysis of mean concentrations from over 13 studies from the US and
British Columbia. |
| Smullen
and Cave, 1998 median |
0.26 |
0.26 |
0.26 |
0.26 |
This study
probably represents the most comprehensive data set, with 3,047 event samples
being included from across the nation. The data includes pooled NURP, USGS,
and NPDES sources. The value is a median of EMCs and applies to general
urban runoff (i.e., mixed land uses). |
| US EPA,
1983 median |
0.38 |
0.201 |
- |
- |
These
values represent NURP data for residential and commercial land use. NURP
data were collected in the early 1980s in over 28 different metropolitan
areas across the US. |
| Barrett
and Malina, 1998 |
- |
- |
0.4 |
- |
This data
reflects a study of vegetative swales treating highway runoff in Austin,
TX. Value represents average of the mean inflow concentrations measured
at 2 sites. Data were collected over 34 storm events. |
| Caraco
and Schueler, 1999
|
0.65 |
0.65 |
0.65 |
0.65 |
This value
represents an average of EMC data collected from 3 arid climate locales
(Phoenix, Boise, and Denver). A total of 90 data points are used, with each
site having at least 16 data points. The value applies to general urban
runoff (i.e., mixed land uses). |
| Whalen
and Cullum, 1988 |
0.62 |
0.29 |
- |
0.42 |
These
data are from an assessment of urban runoff quality that looked at NURP
and State of Florida data. The NURP data summaries are what is shown. Residential
and commercial values are mean values for specified land uses and reflect
between 200 and 1,100 sampling events depending on the parameter and land
use. Industrial values are from 4 NURP sites and generally represent light
industrial land use. |
| Model
Default Value |
0.4 |
0.2 |
0.5 |
0.4 |
|
|
1: The model default values represent best professional judgement, and give
additional weight to studies conducted at a national level. Data do not
incorporate studies on arid climates. |