... draining units which "bleed" off ground waters, relieving hydrostatic heads. Interstitial spaces in the rock fill dissipate the energy of flood currents ... process.4.How about the influence? Our products have been sold to 5 Continents, over 30 countries including U.S.A, Germany, Korea ... and confident .We always on time to answer every single question you ask.6.If you want to know more , please contact ...