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Title: Cost-estimation manual for sea defences (217/2/A) : draft final report
Author: National Rivers Authority
Document Type: Monograph
This manual is intended for use by NRA planners when developing strategic plans. It provides a quick, consistent assessment of sea defence costs and a ready source of national data. It also gives a consistent basis for the preparation of construction cost estimates and appraising work. Data were acquired from successful tenders for sea defence contracts covering all the NRA Regions executing such Works. Cost functions were produced for the following categories of defence: Earth embankments; Revetments; Rock armour; Seabees; Rock breakwaters and groynes; Concrete walls, including extensions to their height; Steel sheet piling. Cost information relating to timber groynes and beach recharge are also presented, however further data will be required before suitable cost formulae can be produced. All the cost data have been adjusted to a common date basis, namely Quarter 3 for the year 1989. By relating costs to the scale of work undertaken in each category, cost-estimating formulae have been derived for national application. The basic data were rather sparse in several instances and this is reflected in the confidence limits presented for some cost functions. The recommendations include making progressive improvements to the preliminary cost estimating models, by gathering further cost data systematically. The model building techniques described here could also be used to produce cost functions for fluvial defences, as well as for other coastal and estuarine structures not addressed in the present report.
Publisher: National Rivers Authority
Publication Date: 1991
Publication Place: Bristol
Subject Keywords: Flood defence structuresBreakwatersGroynesCost analysisEmbankmentsEnvironmental planning
Extent: 60; + appendices
Total file downloads: 287

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