Nathaniel Beardmore (19 March 1816 – 24 August 1872) was a British civil engineer known for his textbook on hydraulic engineering, and his work on water projects associated with the River Lea.
Beardmore was born on 19 March 1816 in Nottingham, England. He began his professional education as a pupil to Plymouth architect George Wightwick, and subsequently apprenticed to the well-known civil engineer James Meadows Rendel (1799-1856). He later became a partner in Rendel's engineering practice, for which he prepared surveys and drawings of railways, roads, bridges and harbors, worked on water supplies in both Scotland and England, and to a lesser extent worked on railroad projects. His partnership with Rendel ceased amicably in 1848, and Beardmore in 1850 became the sole engineer for the drainage and navigation works on the River Lea. In 1854 he was awarded a Telford Medal by the Institution of Civil Engineers for his paper 'Description of the Navigation and Drainage Works, recently executed on the Tidal portion of the River Lea'.
A man of diverse talents and many interests, he was elected a Fellow of the Geological Society of London (1848), and a Fellow of the Royal Astronomical Society (1858). He was also elected a member of the Institution of Civil Engineers (1846), and a member of the Royal Meteorological Society (1851), serving in 1861 and 1862 as president of the latter society.
Beardmore moved in 1855 to Broxbourne, Hertfordshire, where he died on 24 August 1872 of pneumonia. His eldest son Nathaniel St. Bernard Beardmore inherited his business and carried on his engineering practice.
Beardmore published a well-known book, Hydraulic Tables, in 1850, when he began his own engineering practice. Subsequent editions of this work under the longer title of the Manual of Hydrology; containing I. Hydraulic and other Tables; II. Rivers, Flow of Water, Springs, Wells, and Percolation; III. Tides, Estuaries, and Tidal Rivers; IV. Rain-fall and Evaporation became the standard professional text-book for hydraulic engineering.