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Bill Thayer

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Part VI
This webpage reproduces a section of
1895 Advisory Board Report
on the
Drainage of the City of New Orleans

Text and maps are in the public domain.


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Appendix II
This site is not affiliated with the US Military Academy.

Appendix I
Definitions and Descriptions of Names and Terms applied to different parts of the work

"Drainage Districts" refers to the sub-divisions of the city with reference to the existing drainage system, as shown on Plate III. The city is now divided into three districts, known as the First, Second, and Third Drainage Districts.

"Drainage Sections" refers to the proposed sub-divisions of the city into drainage areas, and conforms to the proposed drainage plan, as shown on Plate IV. There will be six of these sections, to be known as the First, Second, Third, Fourth, Fifth and Algiers Sections. The area comprised in each section being that which will be drained by each of the five Main Pumping Stations, located on the Main Canal, as also one in Algiers.

The Draining Machines of the present system are five in number. They are designated by the names London, Orleans, Bienville, Melpomene and Dublin, and are located as shown on Plate III.

The Pumping Stations of the proposed system are nine in number, and are known as No. 1, located on Broad street, at the New Orleans Navigation Canal; No. 2, located at the intersection of Broad and St. Louis streets; No. 3, located at the intersection of Broad street and St. Bernard Avenue; No. 4, located at the intersection of Florida Avenue and Lafayette Avenue; No. 5, located at the intersection of Jourdan Avenue and Florida Avenue; No. 6, an auxiliary station, located at the intersection of Metairie Ridge and Upper Protection Levee; No. 7, an auxiliary station, located at the intersection of Taylor avenue and Orleans street; No. 8, an auxiliary station, located at the intersection of London and Monroe Avenues, and No. 9, located at the intersection of Canal avenue and Lawrence Street, in the Algiers Section.

"Cairo Datum," abbreviated "C. D.", refers to a plane 21.26 feet below Mean Gulf Level, and is the datum to which all elevations are referred.

"Main Canal" refers to the proposed Canal on Broad street, Hope street, and Florida Avenue from the Intersection of Nashville Avenue and Claiborne street to Pumping Station No. 5.

"Branch Canals" refers to all Canals discharging direct into the Main Canal.

"Main Drains" refers to conduits discharging into the Branch Canals.

"Branch Drains" refers to conduits discharging into Main Drains.

"Relief Branch Canals" refers to those Canals which lead from the Pumping Stations, located on the Main Canal, to the Auxiliary Stations, and which are used for a double purpose, namely, as Branch Canals during dry weather, and light storms, discharging into the Main Canal, and as Relief Canals during heavy storms, delivering the water to the Auxiliary Pumping Stations.

"Main Outfall Canal" refers to the Canal delivering the water from the Pumping Station on Florida Avenue at the intersection of Jourdan Avenue to the Bayou Bienvenu.

"Relief Outfall Canals" refers to the Canals delivering water from the three Auxiliary Pumping Stations, as also from Station No. 4 to Lake Pontchartrain.

"Street Gutters" refers to the small conduits, which may be covered or uncovered, collecting the water from the street and discharging into the Branch Drains.

"Run‑Off" refers to the rate of delivery of precipitation into the Canals and Drains.

"The Run‑Off Curves" on Plate VIII show in cubic feet per second, the volume of the run‑off which the proposed system is designed to effectively handle, from surfaces having different areas, slopes and density of population.

The word "Zone," where used in connection with this report, refers to the comparative impermeability of the surface of the ground.

"Zone A," refers to the densely improved sections, such as the territory embraced between the River, Rampart, Toulouse and Delord streets.

"Zone B," refers to a territory of medium density as to improvements, such as is embraced between Washington, Felicity, the River and St. Charles streets.

"Zone C," refers to sparsely built territory where the houses are surrounded by large yards with little or no pavement, such as the territory between Washington Avenue, Audubon Park, the River and St. Charles street.

"Zone D," refers to rural or agricultural areas such as Audubon Park, or farming lands.

The word "Normal," as used in this report, for drainage discharge, refers to the conditions existing when little or no rain-fall occurs.

Thayer's Notes:

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Page updated: 28 Oct 17