# Adapted Chesapeake Nutrient and Sediment Load Reduction Model

**Load reduction estimates** in FieldDoc are based on data from the Chesapeake Bay Program's Phase 6 model. These estimates are calculated by combining the type of [best management practice (BMP)](/essentials/activities/general-settings/activity-type.md), the **size** or area it treats, and its **location** within a specific land-river segment. The system then applies the corresponding nutrient or sediment reduction efficiency.

To simplify this process, FieldDoc uses the **Adapted Chesapeake Nutrient and Sediment Load Reduction Model**, which relies on standard efficiencies. This model is designed to make data entry easy while still maintaining scientific credibility.

It’s important to note that this tool is not intended to replace official Chesapeake Bay Program scenario tools or provide exact numbers for TMDL targets. Instead, it offers a general estimate of nutrient or sediment reductions based on the size, type, and location of a practice—helpful for understanding potential environmental benefits before implementation.

## Source Documentation

<table data-view="cards"><thead><tr><th></th><th data-hidden data-card-target data-type="content-ref"></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td>Chesapeake Assessment Scenario Tool</td><td><a href="https://cast.chesapeakebay.net/">https://cast.chesapeakebay.net/</a></td><td><a href="/files/N6RuwmufeTPtKI6BQjsY">/files/N6RuwmufeTPtKI6BQjsY</a></td></tr><tr><td>BMP documentation</td><td><a href="https://cast.chesapeakebay.net/Documentation/BMPs">https://cast.chesapeakebay.net/Documentation/BMPs</a></td><td><a href="/files/N6RuwmufeTPtKI6BQjsY">/files/N6RuwmufeTPtKI6BQjsY</a></td></tr></tbody></table>

### Activity model view

<figure><img src="/files/uT0vG7b3i4eNi6wY1Vwj" alt="" width="563"><figcaption></figcaption></figure>

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