of chlorine dioxide as a bactericide. Appl. Microbiol. 13:776-780. 1965-We found chlorine dioxide to be a more effective disinfectant than chlorine in sewage effluent at pH 8.5. Chlorine dioxide was also found to be a more stable bactericide in relation to pH in the range studied.

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We found chlorine dioxide to be a more effective disinfectant than chlorine in sewage effluent at p H 8.5. Chlorine dioxide was also found to be a more stable bactericide in relation to p H in the range studied.

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A set of chance-constrained linear programing models for the conjunctive use of surface waters and groundwaters was developed for the Mullica River basin in New Jersey. A zero order decision rule was used to obtain deterministic equivalents for the chance-constrained models. The resulting linear programing models were solved for a variety of constraint situations. The results indicated the maximum total withdrawals that could be expected from the basin for the assumed conjunctive use operation. The satisfaction of specified target outputs for the basin by alternative feasible combinations of surface water and groundwater withdrawals was also demonstrated.Comprehensive planning for the efficient use of the water resources of an area must necessarily consider the development of both surface water and groundwater resources. In many instances, depending on the characteristics of the area involved, optimal development will include the conjunctive use of surface water and groundwater reservoirs for water supply. As explained by Todd [1959], '-.. the basic difference between the usual surface water development with its associated ground water development and conjunctive operation of surface and ground water reservoirs is that the separate firm yields of the former may be replaced by amore economic joint yield of the latter ..-conjunctive use requires little in the way of special facilities ... it is more a matter of proper operation form•ximum effectiveness of surface and ground water reservoirs.' A great deal of time and effort has been spent during the past decade on the development of conjunctive use planning models [Aron, 1969; Buras, 1963; Burr, 1964; Chun et al., 1964; Dracup, 1965; Eshett and Bitringer, 1965; Fowler and Valentine, 1964; Milligan, 1969]. Most of these studies are based on the water requirements and hydrologic conditions of the western part of the United States or, more generally, semiarid to arid areas. The major emphasis in a majority of these studies is on the develop-Department of Environmental Resources. Department of Civil Engineering. ment of water supply. Little attention is focused on residual streamflow requirements for pollution abatement, recreation, wildlife, and other interests that may be affected by such an operation. The stochastic nature of the problem is included in several of the investigations but primarily on an expected value basis. The general problem of the conjunctive use of surface water and groundwater resovurcs forms the basis of this paper. In particular, the development of a conjunctive use planning model incorporating the stochastic nature of the problem and including indirect considerations of the various uses of streamflow is considered. The area of application for this investigation is the Mullica River basin in New Jersey. TaE •ULL•C• R•VER The Mullica River basin is located in the relatively unpopulated and un•leveloped Pine Barrens region of the New Jersey coastal plain (Figure 1). The basin was selecte•l as the area of application for this investigation for tw...