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Definite of Storage in Water Balance Table


ht512
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I'm not sure if there is a definition somewhere around, but going through the following has helped me to think about it.

If you were to write a balance equation you could write:

IN - OUT = ACCUMULATION

An excess of IN causes ACCUMULATION. The IN and OUT parts come from change due to boundary conditions and the ACCUMULATION comes from change in STORAGE. Let's separate ACCUMULATION into two parts:

IN - OUT = STORE_INCREASE - STORE_DECREASE

If there is no in and out in a cell, any increase in storage comes from STORE_INCREASE and decrease from STORE_DECREASE. Now let's move parts of accumulation to each side:

IN + STORE_DECREASE = OUT + STORE_INCREASE

This matches up to the values given in the balance. STORAGE_DECREASE values are given as a positive value and STORAGE_INCREASE are given as a positive values. This would mean that an increase of storage on the IN side goes out of the cell and the OUT side goes in the cell.

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