* Step 7: Multiply the depth of each separate component by the porosity and then sum the total to find the 1 dimensional storage (in mm).
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* Step 7: Multiply the depth of each separate water-retaining component layer in the profile of the practice by its corresponding porosity and then sum the total to find the 1 dimensional storage (in mm).
* Step 8: Calculate the required total storage (S<sub>T</sub>, m<sup>3</sup>):
* Step 8: Calculate the required total storage (S<sub>T</sub>, m<sup>3</sup>):