Playas parameters and Fields definition

[Judith Eeckman]

Dear all,

I have two questions on two different topics:

1- I define infiltration zones as 'playas' (lakes with RES=4). However, infiltration for these HRUs is very low and percolation to the aquifer is nul. I modified the hydrology.res parameters to reflect the volume/surface area of the pond, but this did not change anything. I also tried to force the connection with the aquifer by adding an 'outflow' to the aquifer, but I still have zero percolation. What can I do?

2- I would like to associate several 'Fields' with an HRU, each with a different land_use_management but the same land_use. How can I do this?

Many  thanks

[Chris George]

On question 1 I hope someone else will answer: I am not a hydrologist.

For question 2, assuming you want to do the same with all HRUs (or at
least all HRUs with a particular landuse) you can do as follows. Let us
assume the landuse is AGRL. Then you add as many new landuses as you
like to the plant table in the project database, each a copy of the agrl
row, but with name agrl1, agrl2, etc (or with whatever names you wish,
as long as they are new). Then use the split landuses method to divide
AGRL into, say, 25% AGRL1, 35% AGRL2, etc. Now each AGRL HRU will have
a collection of landuses, and you can define different management
schemes for each.

Chris

On 3/10/2026 5:28 PM, Judith Eeckman wrote:
> Dear all, I have two questions on two different topics: 1- I define
> infiltration zones as 'playas' (lakes with RES=4). However, infiltration
> for these HRUs is very low and percolation to the aquifer is nul. I
> modified the hydrology. res parameters

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