> For the complete documentation index, see [llms.txt](https://help.fielddoc.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.fielddoc.org/resources/models/stormwater-performance-standard-treatment-depths-other-than-1-inch.md).
# Stormwater performance standard - Treatment depths other than 1 inch
Estimate nutrient and sediment load reductions using data and algorithms from the Chesapeake Bay Program's Expert Panel Report on Stormwater Retrofits.
## Qualifying conditions
Eligible runoff reduction practices are:
* [ ] landscape restoration/reforestation;
* [ ] riparian buffer restoration;
* [ ] rooftop disconnection (to amended soils; conservation area; or pervious area);
* [ ] sheetflow to filter/open space; non-structural BMPs (chapter 5 of 2006 Pennsylvania Stormwater BMP manual);
* [ ] all ESD practices in MD 2007;
* [ ] bioretention/rain garden;
* [ ] dry channel regenerative stormwater conveyance;
* [ ] dry swale;
* [ ] expanded tree pits;
* [ ] grass channels: with soil amendments; aka bioswales;
* [ ] green roofs; green streets;
* [ ] infiltrations practices: infiltration basin; infiltration bed; infiltration trench; dry well; landscape infiltration;
* [ ] permeable pavement;
* [ ] rainwater harvesting.
Eligible stormwater treatment practices are: constructed wetlands; filtering practices (e.g. constructed filters; sand filters; stormwater filtering systems); proprietary practices (manufactured BMPs); wet ponds; and wet swales.
{% hint style="success" %}
To begin using this model, you must click the button that affirms that the projects meets all qualifying conditions.
{% endhint %}
1. Connect an activity. (optional)
2. **Select land river segment.** Click or draw on the map to select land river segments. Segments determine which load source categories and rates are available for this model
3. **Model inputs**. Calculation mode.
* Runoff reduction
* Stormwater treatment
{% hint style="info" %}
To help determine the load source acres draining to your activity, access the land use/land cover data for your county through [this web page](https://cicgis.org/portal/apps/webappviewer/index.html?id=bdf7ca3e249a40fd9a9d83d6e16100ea\&extent=-88.252,35.0981,-62.3462,45.7489). Select your county from the map and download the "Land Use Land Cover 2017\_2018" dataset. After opening the file in a GIS application, use zonal statistics within your BMP drainage area to calculate the total load source acres for each category below.
{% endhint %}
Check the box to add the existing BMP on the restoration site. Select the BMP type from the drop-down list.
4. Estimated nutrient and sediment load reductions. Outputs represent the estimated load reductions basd on the treatment inputs and load source categories selected above.
6. Add label and notes.
---
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