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2. French drain - Wikipedia

   en.wikipedia.org/wiki/French_drain

   The earliest forms of French drains were simple ditches that were pitched from a high area to a lower one and filled with gravel. These may have been invented in France, [3] but Henry Flagg French (1813–1885) of Concord, Massachusetts, a lawyer and Assistant U.S. Treasury Secretary, described and popularized them [4] in Farm Drainage (1859). [5]

3. Infiltration/Inflow - Wikipedia

   en.wikipedia.org/wiki/Infiltration/Inflow

   Infiltration will occur where local groundwater elevation is higher than the sewer pipe. Gravel bedding materials in sewer pipe trenches act as a French drain. Groundwater flows parallel to the sewer until it reaches the area of damaged pipe. In areas of low groundwater, sewage may exfiltrate into groundwater from a leaking sewer. [6]

4. Drainage equation - Wikipedia

   en.wikipedia.org/wiki/Drainage_equation

   A drainage equation is an equation describing the relation between depth and spacing of parallel subsurface drains, depth of the watertable, depth and hydraulic conductivity of the soils. It is used in drainage design. Parameters in Hooghoudt's drainage equation. A well known steady-state drainage

5. 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.

6. Basement waterproofing - Wikipedia

   en.wikipedia.org/wiki/Basement_waterproofing

   A French drain, PVC pipe, or other drainage system is installed in the newly made channel. The installed drain is covered with new cement. The installed drain is covered with new cement. The drainage system collects any water entering the basement and drains it to an internally placed sump pump system, which will then pump the water out of the ...

7. French catheter scale - Wikipedia

   en.wikipedia.org/wiki/French_catheter_scale

   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 compared to a 20 Fr three-way catheter, they both have the same external diameter but the two-way catheter will have a larger drainage channel than the three-way.