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Water session; lSpp. Key words: flood forecasting; discharget urban runoff; runoff: mathematical models. peak stO[tI A description is given of three methods which are used overseas and which could be employed in the future to estimate design flood peaks for urban New Zea- land catchments. The three methods ace: the statistical Rational Formula: regional flood frequency analysis; and catchment modeling (specifically the Iaurenson model). However, th~ devel- opment of such methods is restricted at present by the limited zmount of data on urban New Zeal~nd catchments. BEACH, C.H. 1964: .Runoff and stream con- trol in urban areas.. NZIE Symposium, The use and control of water in New Zealand; pl07-1l5. (Discussion p124-127). Key words: erosion: flood control ~ peak discharge; storm runoff. Flooding and erosion shou11 always be considered together; they are one in- volved problem. Flooding rarely occurs without erosion and both are ~qually damaging. One may control flooding only to find that the methods adopted have created an erosio~ problem. This paper is conc~rned with urbDn areas only and is writt~n to promot~ discus- sion. It maintains that: (1) for r~a- sons of economy it is necessary to avoid over-design as much as ~nder-design in the planning of storm water systems. 90th lead to extra ex- penditure; (2) the popular "r~tional. formula for estimating pe~k flows has its limitations and is often applied to problems for which it is quite unsuited: and (3) there is a n~ed to investigate the reliability of formulae and methods used for estimating runoffs from urban catchments that discharge through larger pipes and channels. BECKER, B.C. and MILlS, T.R. 1972: .Guidelines for erosion and sediment control planning and implemen- tation-. Hittman ^ssociates, Inc., Co- lumbia, ~d. W73-BI773, EPA-15030-FNZ/2; 243pp. (NTIS 03-213 119/1). key words: urbanisation; erosion control; sediment transport. The principal porpose of the guidelines is to h~lp those engaged in urban con- struction to prevent th~ uncontrolled movement of soil and the subsequent damage it causes. A comprehensive ap- proach to the problem of erosion and sediment control provides:' a -:lescrip- tion of how a prelimin~ry site evalua- tion dete[min~s what potential sediment and erosion control problems exist at a site being considered for dev~lopment; guidance for the planning of an effec- tive sediment and erosion control plan~ and procedures for the implementation of that plan during operations. Technical information on 42 sediment and erosion control products, prac- tices, and techniques is contained in ~ foue .appendices. BEERS, G.D. 1913: -Management of storm water runoff in suburban ~nvironments". Engineering Science Inc., Cincinnati, Ohio, completion report; l2lpp. Key words: surface runoff; trol; watershed manag~ment: noff. . floOo1 con- storm ru- The overall objective was to ~ssess th~ feasibility of managinq surface runoff from various suburban watersh~~s to meet suburban water deman~s. Definitive results were not anticioat~d from this study. Rather a first cut definition of an essentially unchart~d area in suburban hydrology would he constituted. Although it aopears technically possible to jncor?orat~ storm water runoff into the suburban water resources arsenal, a number of key areas require a~dition~l inform~- tion before the overall f~~sibility can be ascertained. First, information is needed on the current status of subur- ban social attitudes towards the reus~ of storm water ~nd all that it impli~s. Second, certain modifications could be made to suburban watersh~~ surfaces, and in man's use of them, with resul- tant higher quality runoff flows from these watersheds. . aELL, D.E. et al. 1975: .Variation of urban runoff qu~lity and quantity with duration and intensity of storms". Phase III, Vol.2, impacts of dual storms. TE'xas University, Lubbocy., Water Resources Centre; 59pp. (g~e also Phase III, Vols. 1,3,4). Key words: model studies; mathematical models; water pollution; urban runoff. The urban runoff modE'l proposed by Aus- tin to describe both quantity and qual- ity of runoff was applied to a 1499 acre area. The mod~l was then modifi~1 to include parameters related to sand/dust storm events. aELL, W. and WINN, C.R. 1972: -Minimisation of pollution from combined storm sewer systems.. In, International symposium on systems en- gineering and analysis, Vol.II, contri- buted papers, purdue University~ p41-48. Key words: combined sewers; water pollution control: water pollution: sewage treatment; overflows. A nation31 survey has disclosed the fact that there are 1,329 jurisdictions utilising combined severs serving ap- proximately 36 million people. These systems were built prior to the estab- lishment of new water auality require- ments and consequently they do not meet present and proposed stand~rds on water pollution. This results from the fact that they were designed to overflow during storms in ord~r to relieve sev- ere overloading of coll~ction lin~s, interceptors, and sewage ~umping and . .