StormChamber systems provide the lowest cost, highest pollutant removal rate underground storm water management system on the market. StormChamber is an open bottom, arch-shaped, HDPE infiltration chamber which functions in both permeable and non-permeable soils for subsurface retention, detention, conveyance and reuse of storm water, or gray water, designed to overcome the deficiencies of other technologies. It provides a higher level of nutrient and pollutant removal by taking advantage of the natural biological and physical properties of the soil. StormChamber® systems mimic pre-development conditions by putting post-construction run off back into the ground approximately where it used to go, maintaining base flow to streams, wetlands, lakes, ponds and countering salt-water intrusion in coastal areas. During “normal” conditions, approximately 50% ofstream flow is from base flow. Base flow comprises 100% of stream flow during low flow periods. The SedimenTrap component of the StormChamber system eliminates the need for pre-treatment devices and provides a more effective level of sediment and debris removal and retention at a fraction ofthe cost. StormChamber is also surprisingly strong, exceeding the AASHTO H-20 wheel load rating by more than 4 times.