The lead joint used by the Spring Valley Water Company for the cast iron pipe of its distributing pipe system in San Francisco /

Mode of access: Internet.

Specifications for making and laying 54" wrought iron pipe, asphaltum coating for pipes, & for the manufacture of flange boiler iron.

Mode of access: Internet.

London (Watford) spring-water company : report to the directors /

Includes geological map of southeast section of England.

Flood plain information, Spring Valley Creek, San Diego County, California /

Mode of access: Internet.

Salinas Valley water project : environmental impact statement.

Mode of access: Internet.

By-laws and organization for conducting the business of the Allegheny Valley Railway Company /

"To take effect February 29th, 1892."

Ordinances and contracts under which the Mahoning Valley Railway Company, the Youngstown & Sharon Street Railway Company, the Youngstown Park & Falls Street Railway Company, the Youngstown Consolidated Gas & Electric Company are operating within the City of Youngstown, Ohio.

Mode of access: Internet.

Economic impact assessment regarding R82-3 : a site specific exemption for the Alton Water Company /

Project 80.280.

Pilot groundwater protection needs assessment for Illinois American Water Company's Pekin Public Water Supply Facility number 1795040 /

"November 1992."--Cover.

The charter and ordinances of the city of Rockland : together with the boundaries of the several wards, regulations respecting gunpowder, list of town officers from 1848 to 1854, a catalogue of the city government from 1854 to 1885, a list of city officers under the statute, instructions to ward officers, contract with the Camden and Rockland Water Company, and an abstract of laws relating to the powers and duties of cities.

Includes indexes.

Report upon the value of the properties of the Charleston light and water company, Charleston, S.C. May 1, 1914,

Mode of access: Internet.

Annual Report of the Board of Directors of the Lehigh Valley Railroad Company to the Stockholders

Mode of access: Internet.

Ground-water quality and geochemistry of Las Vegas Valley, Clark County, Nevada, 1981-83 : implementation of a monitoring network /

Mode of access: Internet.

A modelling approach to the development of an active management strategy for the Queen Elizabeth II reservoir

This article outlines the outcome of work that set out to provide one of the specified integral contributions to the overarching objectives of the EU- sponsored LIFE98 project described in this volume. Among others, these included a requirement to marry automatic monitoring and dynamic modelling approaches in the interests of securing better management of water quality in lakes and reservoirs. The particular task given to us was to devise the elements of an active management strategy for the Queen Elizabeth II Reservoir. This is one of the larger reservoirs supplying the population of the London area: after purification and disinfection, its water goes directly to the distribution network and to the consumers. The quality of the water in the reservoir is of primary concern, for the greater is the content of biogenic materials, including phytoplankton, then the more prolonged is the purification and the more expensive is the treatment. Whatever good that phytoplankton may do by way of oxygenation and oxidative purification, it is eventually relegated to an impurity that has to be removed from the final product. Indeed, it has been estimated that the cost of removing algae and microorganisms from water represents about one quarter of its price at the tap. In chemically fertile waters, such as those typifying the resources of the Thames Valley, there is thus a powerful and ongoing incentive to be able to minimise plankton growth in storage reservoirs. Indeed, the Thames Water company and its predecessor undertakings, have a long and impressive history of confronting and quantifying the fundamentals of phytoplankton growth in their reservoirs and of developing strategies for operation and design to combat them. The work to be described here follows in this tradition. However, the use of the model PROTECH-D to investigate present phytoplankton growth patterns in the Queen Elizabeth II Reservoir questioned the interpretation of some of the recent observations. On the other hand, it has reinforced the theories underpinning the original design of this and those Thames-Valley storage reservoirs constructed subsequently. The authors recount these experiences as an example of how simulation models can hone the theoretical base and its application to the practical problems of supplying water of good quality at economic cost, before the engineering is initiated.