Note sull'episodio
How French Drains Redirect Subterranean Water
Parole chiave
FrenchHenryInsteadFluid DynamicsTreasury SecretaryFarm DrainageFlaggSoaker HoseWeeping TileEighth InchHydrostatic PressurePerforated PipeInch GapRoofing TilesSubterranean HighwayReverse SoakerCurtain DrainSurface Runoff