> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/theoretical-documentation/section-8-water-bodies/pesticides-in-water-bodies/pesticide-in-the-sediment/burial.md).

# Burial

Pesticide in the sediment layer may be lost by burial. The amount of pesticide that is removed from the sediment via burial is:

        $$pst\_{bur}=v\_b*SA*\frac{pst\_{lksed}}{V\_{tot}}$$                          8:4.2.14

where $$pst\_{bur}$$ is the amount of pesticide removed via burial (mg pst), $$v\_b$$ is the burial velocity (m/day), $$SA$$ is the surface area of the water body (m$$^2$$), $$pst\_{lksed}$$ is the amount of pesticide in the sediment (mg pst), and $$V\_{tot}$$ is the volume of the sediment layer (m$$^3$$).

Table 8:4-2: SWAT+ input variables related to pesticide in the sediment.

| Variable Name | Definition                                                                                    | Input File |
| ------------- | --------------------------------------------------------------------------------------------- | ---------- |
| LKPST\_KOC    | $$K\_d$$: Pesticide partition coefficient (m$$^3$$/g)                                         | .lwq       |
| LKSPST\_REA   | $$k\_{p,sed}$$: Rate constant for degradation or removal of pesticide in the sediment (1/day) | .lwq       |
| LKPST\_RSP    | $$v\_r$$:Resuspension velocity (m/day)                                                        | .lwq       |
| LKSPST\_ACT   | $$D\_{sed}$$: Depth of the active sediment layer (m)                                          | .lwq       |
| LKPST\_MIX    | $$v\_d$$: Rate of diffusion or mixing velocity (m/day)                                        | .lwq       |
| LKSPST\_BRY   | $$v\_b$$: Pesticide burial velocity (m/day)                                                   | .lwq       |