<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 />
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