Dear WEAP Team members,

I would like to ask you some questions about soil library.

In setup phase of my hydrological model, I compared 'WEAP soil library' with 'ROSETTA Class Average Hydraulic Parameters' and realised a minor problem.

There are 'Saturated hydraulic conductivity values (Ks)' in soil library but it fact those values must be 'saturated water contents (theta s)'. I guess, just coloumn heading is wrong, don't think it affects calculations.

But in that case, where are the 'sat. hydr. cond.' values in library? I specified soil water capacity using soil library, and left blank Saturated hydraulic conductivity value (any catchment/land use/sat. hyd. cond.).
I am curious about that must we enter this value in data manually?


I will be glad, If you could clarify this issue.

Thanks...

Also I realised that when I left blank Saturated hydraulic conductivity (any catchment/land use/sat. hyd. cond.), program use 'theta s' value from library, instead of 'Ks' for calculations.

I think it is an important issue!

Thank you for bringing this to our attention. You are correct. The values in the soil library for saturated hydraulic conductivity are incorrect. I will fix this in the next version of WEAP. For now, you can enter the values yourself.

Here are the correct values for saturated hydraulic conductivity, in mm/day:

Clay 147.5
Clay loam 81.8
Loam 120.5
Loamy sand 1051.9
Sand 6426.8
Sandy clay 113.5
Sandy clay loam 131.8
Sandy loam 382.8
Silt 437.5
Silt loam 182.3
Silty clay 96.1
Silty clay loam 111.1

Jack

Alright. Thank you for this information...

Also I noticed that; when I change values in soil library, it doesn't affect results. We must enter from 'sat. hyd. con.' for each catchments.