Update configuration-zones.md

docs/configuration-zones.md

@@ -44,7 +44,7 @@ You can change the following settings on a zone:
 - **Name**: change the name of a zone
 - **Size**: change the size of a zone
 - **Throughput**: change the throughput of a zone
-- **Drainage rate**: set the drainage rate of a zone. Use this only if you have drainage problems. You will need to do some experimentation to see what value works for you. Too low of a value are your drainage problem is not solved, too high of a value and the effects of the evapotranspiration calculation has little to no impact. Keep in mind that the values quoted on the internet (around 50.8 mm or 2 inch per hour) for drainage rates are dependent on your soil type and are for fully saturated soil only.
+- **Drainage rate**: set the drainage rate of a zone. Use this only if you have drainage problems. You will need to do some experimentation to see what value works for you. Too low of a value are your drainage problem is not solved, too high of a value and the effects of the evapotranspiration calculation has little to no impact. Keep in mind that the values quoted on the internet (around 50.8 mm or 2 inch per hour) for drainage rates are dependent on your soil type and are for fully saturated soil only. It's recommended to start with 0 mm/h and if you have draingage problems, increase it by approx 5 mm/h each 24 hours until you arrive at a level of irrigation that waters your area and doesn't cause puddles to appear. Since this is so dependent on your soil characteristics you will need to do some experimentation to arrive at the optimal value.
 - **State**:
   - _Automatic_: Automatic updating and calculation of that zone. [module](configuration-modules.md) and [sensor group](configuration-sensor-groups.md) is mandatory.
   - _Manual_: Only manual updating and calculation of that zone. No [module](configuration-modules.md) and [sensor group](configuration-sensor-groups.md) is required.