Squeeze Pumps: A Gastrointestinal Analogy

Squeeze Pumps: A Gastrointestinal Analogy

According to the 1966 edition of Ground Water and Wells, squeeze pumps, or peristaltic pumps as they are now called, were often used in the water works industry for purposes of chemical addition. The pump operates using positive displacement to move a variety of fluids. The fluid moves within a flexible tube fitted inside a circular pump […]

Optimum Water Reservoir Capacity

Optimum Water Reservoir Capacity

The Manual of British Water Supply published in 1950 by the Institution of Water Engineers included a very informative discussion of the impacts of the number of pressure zones serving a reservoir and the stand-by capacity of pumped supply upon water reservoir capacity. Those impacts are presented in the table below:

Circulation Pattern within the Impeller of a Centrifugal Pump

Circulation Pattern within the Impeller of a Centrifugal Pump

The Manual of British Water Supply Practice, published in 1950 by the Institution of Water Engineers, included this very informative graphic showing the circulation of fluid within an impeller of a centrifugal pump:

Single Acting Bucket Valve Pump

Single Acting Bucket Valve Pump

One of the better references regarding basic hydraulics is a book by Frank D. Graham published in 1943 entitled Audels Pumps, Hydraulics, Air Compressors.  Here is one of the more interesting graphics:

Large Diameter Water Main Material Options According to Loudoun Water’s Potomac Water Supply Program

Large Diameter Water Main Material Options According to Loudoun Water’s Potomac Water Supply Program

In 2012, the consulting firm Gannet Flemming prepared an engineering report on a major water supply project the Potomac River for Loudoun Water. It is an excellent report and is available online here. The report included a well written evaluation of material options for the 36-inch to 42-inch raw water transmission pipeline. Here is that evaluation: “9.13.2 Material […]

The Salina Grande Pumping Station

The Salina Grande Pumping Station

Pump stations, like much of our infrastructure, are largely ignored by the vast majority of the population. Because such essential components of municipal infrastructure as pump stations tend to go unnoticed, it was a pleasure to read an article by a highly regarded philosopher and educator about a pump station near Seville, Spain. Although the article […]

Befogged By Non-technical Propaganda

Befogged By Non-technical Propaganda

The reconstruction of street and utility projects in older areas, often requires building upon, or modifying structures, pavement and/or subgrade aggregate placed 50 or even 100 years ago. For a variety of reasons, engineers involved in such projects should understand historic construction practices. To that end, an excellent resource is a book published in 1924 […]

Seriously Civil About Crawling Through Sewer Pipes

Seriously Civil About Crawling Through Sewer Pipes

It is hard to believe that live sewers were once manually cleaned by someone crawling through them, but they were.   At least according to a book published in 1901 titled Sewerage, The Designing, Construction, and Maintenance of Sewerage Systems.” By Professor A. Prescott Folwell.   It states: “Even pipe sewers of 18 inches diameter and up […]

Pedestrian Tunnel Presentation at 2013 APWA Spring Conference

Pedestrian Tunnel Presentation at 2013 APWA Spring Conference

Recently attending the 2013 APWA Spring Conference, Mike Conway and I with the assistance of Wes Wegner, and Tim Homann of Skamania County had the opportunity to give a presentation on the subject of pedestrian tunnels. We focused largely on the project development aspect, and on two projects that we were closely involved in: SR-14 […]

Limitations of Precast Catch Basins

Limitations of Precast Catch Basins

Precast catch basins offer some advantages over cast-in-place catch basins – they’re quickly installed, have no field cure time, can require less onsite inspection during installation, and typically are uniform and well-finished. However, precast catch basins have significant maintenance limitations if installed without attention to detail – as demonstrated by these photos. The photo above […]