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2. French drain - Wikipedia

   en.wikipedia.org/wiki/French_drain

   A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.

3. This Drain Mistake Could Be Costly - AOL

   www.aol.com/drain-mistake-could-costly-205600754...

   A French drain is a trench that diverts water away from an area where it's pooling to a lower elevation where it can be released, explains Mike Arnold, director of The Gardens at Texas A&M ...

4. French catheter scale - Wikipedia

   en.wikipedia.org/wiki/French_catheter_scale

   An increasing French size corresponds to a larger external diameter. This is contrary to Birmingham gauge, where an increasing gauge corresponds to a smaller diameter needle. The French size is a measure of the outer diameter of a catheter (not internal drainage channel, or inner diameter). So, for example, if a two-way catheter of 20 Fr is ...

5. Drainage - Wikipedia

   en.wikipedia.org/wiki/Drainage

   Subsurface drains, on the other hand, are designed to manage water that seeps into the soil beneath the planting surface. French drains, which are gravel-filled trenches with perforated pipes at the bottom, are the most common type of subsurface drain. Trench drains, which are similar but shallower and wider, are also used in some situations. [4]

6. Dry well - Wikipedia

   en.wikipedia.org/wiki/Dry_well

   A French drain can resemble a horizontal dry well that is not covered. A larger open pit or artificial swale that receives stormwater and dissipates it into the ground is called an infiltration basin or recharge basin.

7. Percolation trench - Wikipedia

   en.wikipedia.org/wiki/Percolation_trench

   Percolation Trench. A percolation trench, also called an infiltration trench, is a type of best management practice (BMP) that is used to manage stormwater runoff, prevent flooding and downstream erosion, and improve water quality in an adjacent river, stream, lake or bay.