Subsurface gravel wetlands have proven successful as a nitrogen control strategies however costly to construct. Studies show that these systems show a unique ability to remove bioavailable nitrogen in excess of 90% during summer months, and greater than 55% annual phosphorous removal. Gravel wetlands are being implemented as a TMDL compliance measure for roadway expansion in areas with impaired waters. A potentially significant application of GW is their simplicity use as a detention pond retrofit. Two alternate  designs that are reduced in size and scope will be evaluated to assess nutrient removal performance and engineering design andconstruction costs. Design alternate 1 is a subsurface gravel wetland that is narrow and long and intended for installation in thetransportation right of way typically reserved for roadside swales. Design alternate 2 is a subsurface gravel wetland that is a single treatment cell with precast pretreatment device intended as a low-cost stormwater pond retrofit. Research products will include two new designs and design and construction cost estimates for gravel wetlands as a nutrient control strategy.