Our Services: Washington State

Infiltration Testing

We offer infiltration testing for infiltrating BMP's (Best Management Practices). The Simple Infiltration Test is a small-scale infiltration test procedure adapted from the Washington State Department of Ecology (Ecology) Rain Garden Handbook for Western Washington.  This consists of digging a minimum 2 foot wide hole by 2 foot deep hole. 

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Next, we complete a 'pre-soak period' in which we fill the hole with 12 inches of water. We will take two measurements: One at hour #1 and the other at hour #2.  Depending upon the amount that the water infiltrated will determine how often measurements are taken and for how long. Once the test is fully completed we will complete a report to give to the city of Seattle for review.