摘要:

A water well is a hydraulic structure that can become either an efficient tool or a highly inefficient, poorly constructed problem. Efficient water wells depend on construction and development techniques to improve permeability around the well. Good results have been obtained through surging, the high pressure jetting technique, and over‐pumping and air‐development methods.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1981.tb00705.x

出版商:Wiley    

年代:1981

数据来源: WILEY

摘要:

This flexible, two‐fingered tool with a handle grips water valve box lids firmly, pulls straight and evenly, and is easy to apply even on lids that are covered with dirt or are frozen tight.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1981.tb00707.x

出版商:Wiley    

年代:1981

数据来源: WILEY

摘要:

This multiple‐choice quiz asks questions which apply basic metric weights, measures and temperatures to everyday situations.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1981.tb00709.x

出版商:Wiley    

年代:1981

数据来源: WILEY

摘要:

Answers to the “Cross Connection Cross‐Word Puzzle” published in the February 1981 issue of OpFlow are provided.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1981.tb00710.x

出版商:Wiley    

年代:1981

数据来源: WILEY

摘要:

This “Certification Corner” asks questions on collecting samples for bacteriological analyses, repair of packing glands, chlorine application, sand bed expansion during backwash operations, hypochlorinators, sludge accumulations, coliform bacteria measurement, pump efficiency, and pressures associated with loss of head.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1981.tb00711.x

出版商:Wiley    

年代:1981

数据来源: WILEY