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determining the optimum pattern of land user and for the design of storm dra- inage facilities. Data may also be needed for the real time management of water for use in homes and industries~ to reduce flood flowSl and to insure the maximum possible dilution of wastes. This paper reviews the hydro- logic problem~ of urban areas an~ iden- tifies deficiencies in present data programs. Data are classified accord- ing to the two primary uses - planning and design, and management. . CARTER, R.W. and THOMAS, D.M. 1968: "FlOod frequency in metropoli- tan areas-. In, Proe. 4th American Water Resources Association Conference, New York~ p56-67. Key words: discharge~ dels: data flood forecasting: peak urbanisation; computer mo- collection. when one considers that the estimated expenditures for needed urban drainage improvement exceeds 2 billion dollars per year through 1975, the need for data upon which to base adequ~te design is apparent. However, very little data is presently available on flood flow in urban areas. This area of hydrology is not yet receiving the attention it des- erves. Several approaches that have been used by the Geological Survey in studies of the frequency of floods in urban areas are described and compared in this paper. These studies indicate that a large increase in peak flow oc- curs due to urbanisation and that this increase is primarily due to changes in the concentration time of precipitation excess. The design of future Survey projects will feature the use of a di- gital computer model of the rainfall-runoff process and an automat- ed system for the COllection of rain- fall and runoff data. CASTER, A.D. and STEIN, W.J. 1970: -Pollution from combined sewers: Cincinnati, Ohio". ASCE Meet- ing, preprint No.1090J 39pp. Key words: sewage treatment; combin~d sewers; hydrologic data; analytical techniques. The sampling and gauging program was designed to provide basic data to esti- ~ate the magnitude of combined sewage pollution in and from the Mill Creek basin, and by extrapolation, the Cin- cinnati Service Area. The description of the Service ~rea, the background hy- drological and water quality data, the field investigation prcgram, the ana- lysis of the data, and the conclusions are presented herein. CECH, 1. and ASSAF, K. 1976: -Quantitative assessment of changes in urban runoff-. J. Irrigation and Drainage Divn., Proc. ASCE, Vol.102IIR1), pl19-125. Key words: urbanisation: mod~ls. urban storm runoff: runoff: computer " The detection and quantitative aSsess- ment of the magnituoe of man-induced changes in flood regimes in part of the Texas Gulf Coast were made using th~ method of trend surface analysis of distribution of storm runoff. The pro- cedure incorporated the elements of frequency analysis and two- and three-dimensional synographic computer mapping. The natural geographic ten- dency in runoff distribution typical for the study area was compare~ with the runoff pattern induced by urbanisa- tion. The range of differences between urban and non-urban runoff found in this study was proposed as a guide for development planning in the coastal territories that are no~ primarily rural. CBAN, M.L. 1974: .Optimal real-time con- trol of urban storm water drainage-. Tech. Report No.87, studies in the an- alysis of metropolitan water resource systems, V~l.X. Cornell UniverSity, Water Resources and Marine Sciences Centre, Ithaca, N.Y.; l70pp. (NTIS PB-236 SSS). Key words: urban runoff; models; urban drainagel ing. mathematical flood rout- An operational model using optimal con- trol theory is developed for routing urban storm water drainage comprehen- sively in a combined Sewer network. The storm water flow dynamics are mo- deled as a system of linear stochastic difference eouations. Together with a quadratic criterion function, the op- tirnisation model is posed as a stochas- tic output regulator problem. The re- sulting control logic is divided into two parts: the estimator and the con- troller. The incorporation of this control logic into a central computer, coupled with a monitoring ~nd communi- cation network, forms the core of a real-time computer-based automatic routing control system. This control system can be used to improve the ef- fectiveness of storm water runoff rout- inq_ CHANDLER, T.J. Selected T.P.ISS, 1970: -Urban bibliography. 383pp. climate-. WMO-No.276, Key words: bibliographies; modification. weather A fInal version of a selected bibliog- raphy on urban climate, covering more than 2000 references. CHANGNON, S.A. 1963: -A ClimatOlogical evaluation of precipitation patterns Over an urban area-. Robert A. Taft Sanitary Engineering Centre, Tech. Report A62-S: 937-67. Key words: network design: weather modification: instrumentation. Urban rainfall distribution was studied in Champaign-Urbana, Ill., for a period of 13 years. The annual precipitation pattern was compared with that of a