【正文】 including oxidation reduction, ion exchange, and precipitation. [0005] Furthermore, stormwater treatment systems can also be classified in relationship to the treatment level in which they are being used. In this respect the term treatment is generally used to describe the unit processes that are used to reduce the quantities of pollutants and containments in stormwater runoff. For example, basic or pretreatment typically refers to the removal of gross solids, sediments and larger debris through the processes of settling and screening, while enhanced or advanced treatment typically refers to processes for reducing targeted pollutants。 [0021] FIG. 2 is a crosssectional view of the wetlands water treatment system shown in FIG. 1。 [0023] FIG. 4 is a top plan view of a lateral crosssection of the lower sedimentation chamber of the treatment system in FIG. 1。 [0025] FIG. 6 is the view of the treatment system shown in FIG. 3 with the additional of filtration screens to allow sectioning of multiple types of filtration media。s surface. In another embodiment the transfer riser 160 can extend almost to the bottom of the sedimentation chamber 110. The transfer riser 160 allows for water to seep into the treatment chamber 120 which contains a vegetated filtration bed FIG. 2 (225) for filtration. This vegetated filtration bed FIG. 2 (225) can contain various types of filtration media which will be explained in more detail in FIG. 6. [0031] The transfer riser 160 further allows for access by the user for sediment removal and cleanout of the system. Water flows into the inflow pipe 130 and directly into the sedimentation chamber 110. The inflow pipe makes a 90[deg.] angle upon its entry into the sedimentation chamber 110. The water entering the sedimentation chamber 110 is directed to flow in a circular motion through the sedimentation chamber 110 by a flow shield described in more detail in FIG. 4 below. The denser particles of matter settle to the bottom of the sedimentation chamber 110 the water then rises into the transfer riser 160 and filters out through water transfer orifices 200 in the riser into the vegetated filtration bed FIG. 2 (225) where the pollutants are 8 filtered out. [0032] Referring to FIG. 2, as contaminated water exits the transfer riser 160 through the water transfer orifices 200 and enters the vegetated filtration bed 225 it will e in contact with the filtration media contained in the vegetated filtration bed. Initially, filtration of pollutants will occur on the surface of the filtration media. In the treatment chamber 120, it should be noted that sedimentation will continue to occur. Relatively larger particles will bee trapped within the void space between the filtration media particles. Smaller particles and dissolved pollutants will be captured, transformed, consumed by the following biological and chemical processes. Biological nitrification and denitrification will occur in the vegetated filtration bed 225 as may natural unassisted precipitation of dissolved pollutants on media, in particular phosphorus and metals. A biomass (plants) 228 will develop on the filtration media surface. The biomass 228 is sustained by dissolved anic pounds in the water and contributes to biological intake, absorption, and trapping of pollutants. The roots of the biomass 228 grow into the filtration media creating a root zone. The biomass 228 enhances removal of fine sediments, metals, nutrients, bacteria and/or viruses. The biomass 228 also increases the rate of bioaccumulation of pollutants within the vegetated filtration bed 225. Dependent on the specific characteristics of the filtration media and the amount of plant/root matter within the bed, the processes of ion exchange, adsorption, and/or absorption will occur. Dependent on the type and ratios of filtration media used, variations in the amount and effectiveness of the above processes will vary. [0033] The treatment chamber 120 is set up in such a manner so that the water flows in a circular direction throughout the entire vegetated d filtration bed 225 and exits the outflow pipe 140 once it has been cleaned of pollutants. The specific design of this chamber will be explained in more detail in FIGS. 2 and 3 below. [0034] This system can be connected via the inflow pipe 130 to storm water drains, underground sedimentation tanks, sedimentation ponds, or other bodies of water or stormwater capturing devices which may contain polluted water which needs to be cleaned. This system can be described as a horizontal/vertical up flow hybrid filtration system with the additional unique feature in which the inlet and outlet to the chamber are positioned in such a manner as to require the circular motion of the water within the system. The system 100 is a single chamber design, this leads reduced maintenance and increased efficiency over multichamber sedimentation systems in which there are interconnections by elaborate hoses and floatation devices. Systems 9 with many interconnections can bee restricted and plugged when sediment levels reach the bulk head ports. [0035] FIG. 2 is a crosssectional view of the system 100. FIG. 2 shows the treatment chamber 120 filled with a filtration media to create the vegetated filtration bed 225. The filtration media can be gravel or other materials as described in FIG. 6. In the system 100 shown in FIG. 2 biomass 228 is growing at the top of the vegetated filtration bed 225. The top of the vegetated filtration bed 225 sits at ground level and the transfer riser 160 with its cleanout lid 190 extends slightly above ground level. [0036] FIG. 3 is a top plan view of the lateral crosssection of the upper treatment chamber 120. The water flows out of the transfer riser 160 through the water transfer orifices FIG. 1 (200) which can be slits or holes located t