# Water Yield output per pixel

**URL:** <https://community.naturalcapitalalliance.org/t/water-yield-output-per-pixel/1638>\
**Category:** Science, Research & Data\
**Tags:** annual-water-yield\
**Created:** [January 17, 2021, 6:35am UTC](https://community.naturalcapitalalliance.org/t/water-yield-output-per-pixel/1638 "2021-01-17T06:35:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![soo](https://avatars.discourse-cdn.com/v4/letter/s/9dc877/32.png) [@soo](https://community.naturalcapitalalliance.org/u/soo)\
**Post date:** [January 17, 2021, 6:35am UTC](https://community.naturalcapitalalliance.org/t/water-yield-output-per-pixel/1638/1 "2021-01-17T06:35:58Z")

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hello~  
I’m studying the Annual water yield according to the type of land cover. But I found that the total amount of water supply per pixel is different from the amount of water supply in Excel.

In user’s manual-“Outputs in the _per\_pixel_ folder can be useful for intermediate calculations but should **NOT** be interpreted at the pixel level, as model assumptions are based on processes understood at the subwatershed scale.”

1. Why is the water supply value in Excel different from the water supply per pixel in the file?
2. How can I get the exactly value of water yield per pixel?

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**Author:** ![dcdenu4](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/dcdenu4/32/544_2.png) [@dcdenu4](https://community.naturalcapitalalliance.org/u/dcdenu4)\
**Post date:** [January 19, 2021, 2:07pm UTC](https://community.naturalcapitalalliance.org/t/water-yield-output-per-pixel/1638/2 "2021-01-19T14:07:34Z")

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Hi @soo ,

> 1. Why is the water supply value in Excel different from the water supply per pixel in the file?

Are you asking why the `rsupply_vl` and `rsupply_mn` values are different in the Excel file?

> 1. How can I get the exactly value of water yield per pixel?

Water Yield values per pixel are in the `per_pixel` folder. There you will see a raster `wyield`. This model was developed at the watershed and subwatershed scale so exact pixel values should only be used to better understand the process and not for interpreting as accurate on the ground results.

Doug