Projects in progress during the 1972 FY by the Water Resources Research Center of the University of Maryland include: the thermal requirements and tolerance of key estuarine organisms; agricultural waste water accomodation and utilization by various forages; mechanism of organic adsorption on activated carbon; the transient behavior of recharge-discharge areas in regional groundwater systems; a statistical investigation and simulation of hydroclimatological events; pollution loads in percolate water from surface spread swine wastes; bacterial degradation of arylsulfonates in treatment of waste water; analysis of time variant waste treatment systems; chlorinated sewage effluents and avoidance reaction of stream fish; effects of economic development upon water resources; biogeochemistry of estuarine ecosystem with emphasis on heavy metals and shellfish; the effects of thermal loading and water quality on estuarine primary production; and the role of organic debris and associated microorganisms in pelagic estuarine food chains.