Changes

==Decide if an underdrain will be included==

==Decide if an underdrain will be included==

* Step 1: Based on the median measured infiltration rate of the native soil at the estimated location and bottom elevation of the practice, or estimated from the median grain-size distribution results, decide if an underdrain will be included in the design. See [[Design infiltration rate]] for guidance on field tests, methods and number of test locations and tests (i.e. measurements) to be performed.<br>

* Step 1: Based on the median measured infiltration rate of the native soil at the proposed location and bottom elevation of the practice, or estimated infiltration rate from median grain-size distribution results, decide if an underdrain will be included in the design. See [[Design infiltration rate]] for guidance on field tests, methods and number of test locations and tests (i.e. measurements) to be performed.<br>

If the median measured or field estimated infiltration rate of the underlying native soil (f) is less than 15 mm/h, include an underdrain.

If the median field measured or estimated infiltration rate of the underlying native soil (f) is less than 15 mm/h, include an underdrain.

==Select a surface ponding depth to begin sizing with==

==Select a surface ponding depth to begin sizing with==