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<br />and type of drainage system, which may <br />be evaluated by a basin inspection but <br />1n actual practice will usually be es- <br />timated for future developed condi- <br />tions. Based on analysis of flood in- <br />formation for 81 sites, S9 of which are <br />in the Washington, D.C., metropo+itan <br />area, the relations should be useful <br />for design of drainage systems and for <br />definition of flood limits. The rela- <br />tions presented are applicable only to <br />the Washington, D.C., area, but the <br />method of analysis is general and may <br />be used for any area where the major <br />floods result from rainfall. Urban and <br />suburban development are shown to af- <br />fect flood flows to a significant de- <br />gree. Improvements of the drainage <br />system may reduce the lag time to <br />one-eighth that of the natural chan- <br />nels. This lag time reduction, com- <br />bined with an increased storm runoff <br />resulting from impervious surfaces, in- <br />creases the flood peaks by a fa~tor <br />that ranges from two to nearly eight. <br />The flood peak increase depends upon <br />the drainage basin characteristics and <br />the flood recurrence interval. <br /> <br />ANDERSON, H.W. 1957: -Relating sediment <br />yield to watershed variables.. Trans. <br />AGU, Vol.3S, p921-924. <br /> <br />Key words: sediment yield, landuse <br />change, surface runoff; streamflow, <br />sediment transport: suspended solids: <br />mathematical models. <br /> <br />The yield of sediment from watersheds <br />depends upon three sets of variables: <br />(1) inherent watershed characteristics <br />such as geology and topography, (2) <br />land use, condition of vegetation, and <br />management and protective measures; <br />and (3) nature of storms and streamflow <br />which produce and transport sediment. <br />Measured quantities of yield also de- <br />pend on the sediment measuring device <br />and on which fraction of total sediment <br />is measured. The sources of variation <br />in sediment yield between and within <br />watersheds can be evaluated by study of <br />the yiela from many watersheds which <br />have wide differences in variables af- <br />fecting sediment yields. Such studies <br />are useful to determine and evaluate <br />the principal sources of sediment, to <br />evaluate the probable effects of con- <br />servation programs on yield, and to <br />provide criteria for design of reser- <br />voirs and channels. This paper summar- <br />lses some recent studies in which mul- <br />tiple regression analysis was use1 in <br />relating sediment yield to watershed <br />variables. The studies are discussed <br />in the light of methods of selecting <br />watersheds, data, variables, and func- <br />tions: and the effects of neglected <br />variables, errors in variables, and ex- <br />clusion of nonsignificant variables. <br /> <br />ANDERSON, J.J. 1970: <br />control of urban <br />Divn., Proc. <br />p153-164. <br /> <br />-Real-ti.e computer <br />runoff-. J. Hydraul. <br />ASCE, Vol.96(HYl)~ <br /> <br />ley words: <br />urbanisation: <br />runoff: water <br /> <br />.athematical models: <br />combined sewers; urban <br />pollution control. <br /> <br />A real-time process computer control is <br /> <br />.. <br /> <br />.. <br /> <br />being built in the Minneapolis - St, <br />Paul Sanitary District to drastically <br />reduce combined sewer overflows without <br />incurring the huge cost and lengthy <br />construction time involved in instal- <br />ling a separate sewage system in place <br />of combinerl sewers. Th~ use of the ma- <br />thematical model of this interceptor <br />sewer system will aid remote operation <br />of gate settings and runoff diversion <br />devices via a computerised supervisory <br />system. Through gate processinq tech- <br />niques a river quality monitoring pro- <br />gram, the amount, nature, and effects <br />of overflow wastes of the Mi~sissippi <br />River viII be evaluated. Diagrams of <br />the format for the new system are in- <br />cluded in addition to data predicting <br />its future effectiveness. <br /> <br />. <br /> <br />. <br /> <br />ANDERSON, J.J. 1971: -Case study on -design <br />of urban water data acquisition sys- <br />tem-, In. Treatise on urban water sys- <br />tems, (eds. ~.L. Albertson, et al.), <br />Colorado State University, Fort <br />Collins; p557-596. <br /> <br />Key words: data collection: flood <br />contrOl, water pollution control, <br />hydrologic data: instrumentation; <br />model studies: watershed management; <br />storm runoff: urban hydrology. <br /> <br />This case study provides an introduc- <br />tion to the design of urban water d~ta <br />acquisition systems. ~ great deal of <br />judgement is requir~~ concerning all <br />aspects of urban water resourc~s man- <br />agement, and a certain amount of trial <br />and error is necessary. Fortunately, a <br />computer-based data acquisition system <br />is extremely flexible and can be re- <br />vised easily. A trial design is out- <br />lined for acquiring data for major r~- <br />visions to the waste water and surf~ce <br />water collection systems. The revi- <br />sions might include lumped or distri- <br />buted storage, relief or express <br />sewers, transfer of flow between b~- <br />sins, and multiple facilities. The <br />kinds of data needed concern surface <br />water, rainfall, runoff, and waste <br />water. Surface water informGltion <br />should include flow as well as Quality <br />measurements. ~easurements should show <br />the conditions before and after the ~d- <br />dition of pollutants. Runoff data in- <br />clude flow and quality in both combined <br />and separate storm sewer systems. <br />Measurements should be taken at key <br />junctions, aajor outlets, and treatm~nt <br />facilities. An atte~ot should be made <br />to provide correlations with ~ramet~rs <br />measured on-line. <br /> <br />ANDERSON, M.W. and ROSS, B.E. 1975: -1\ <br />hydrologic study of a small suburban <br />watershed.- Florida Univ., Gainsville, <br />Water Resources Research Centre, Publi- <br />cation 31: 96pp. <br /> <br />data col- <br />storm ru- <br />nutrients: <br /> <br />Key words: instrumentation: <br />lection: hydrologic data: <br />noff: suspended solids: <br />phosphorus compounds. <br /> <br />A 126 acre tract of land in a natural <br />undisturbed state, and adjacent 239.3 <br />acres that made uo the watershed, w~re <br />instrumented in November 1971 in or~er <br />to determine the effect of development <br /> <br />. <br />