Levels with Automatic Instruments
As a method of obtaining an increase in accuracy for vertical control, the U.S. Lake Survey has adopted the use of the Zeiss Ni 2 self-leveling level equipped with plane-parallel plate...

Control Surveys: Historical Summary, Preface, and Chapter 1
This report reviews preliminary needs for modern control survey standards and applications with information sources. Control surveys are defined, as well as kinds of measurement, triangulation,...

Currents in an Interoceanic Canal
The feasibility of a sea-level canal between the Atlantic and Pacific Oceans is under consideration by the U.S. Army Corps of Engineers as the agent for a five-man Interoceanic Canal Commission...

Revetment Construction by Fabriform Process
The Fabriform process employs high strength, water-permeable synthetic fabric as a concrete forming material. Water/cement ratio is reduced by forcing vehicle water through fabric, causing...

Alfalfa Water Table Investigations
Use of water by alfalfa growing under high water table conditions was studied to determine the irrigation requirement. A three-season average of consumptive use and yield of alfalfa, disregarding...

Equilibrium Flow Areas of Inlets on Sandy Coasts
The minimum flow area below mean sea level in the entrance channel of a tidal inlet on a sandy coast is a unique function of the tidal prism. Bottom material size, presence or absence...

Lake Michigan-Huron Stage-Frequency and Trend
Stage of Lake Michigan-Huron and its post-glacial antecedents has ranged 400 ft and its early north shore has been uplifted by crustal deformation 270 ft above the present shore. Eustatic...

Nuclear Excavation of a Sea-Level Isthmian Canal
The study considers the construction of a sea level canal from the Gulf of Aqaba to the Mediterranean Sea, by means of nuclear explosives. In 1956 a similar proposal was reviewed and rejected...

History and Present Status of Regulation and Regulation Studies of Water Levels and Flows on the Great Lakes

Potential Benefits of Great Lakes Level and Flow Regulation

Regulation of Great Lakes Levels and Flows

Effects of Diversions on the Great Lakes

Control for Antarctic Ice Cap Reconnaissance
The methods used to provide horizontal and vertical control for the reconnaissance of an Antarctic ice cap are discussed and evaluated. Primary horizontal control was established by the...

Computing the Barometric Efficiency of a Well
The barometric efficiency of a well may be determined from the slope of a graph of ∑ΔB against ∑ΔW, in which ∑ΔB is the arithmetical summation of the incremental changes, ΔB, of the atmospheric...

Inflatable Dams
An inflatable dam provides an inexpensive and simple device for controlling the water level in a river, canal, or reservoir. It can operate under hydrodynamic conditions satisfactorily...

Land Modification for Efficient Use of Water
For any water management practice to function efficiently, the surface of the land must be properly prepared. The following methods are considered: land grading for surface drainage in...

Evaluation of Accuracy of Precise Leveling
Three sources of errors in precise leveling are described: (1) Errors due to rod readings by estimation to 0.10 of the rod division and with the aid of a planoparallel micrometer; (2)...

Construction Planning for a Sea-Level Panama Canal
The conversion of the existing Panama Lock Canal to sea level will be the largest earthmoving project ever undertaken. Depending on the final cross section selected, it will require the...

Water-Level Fluctuations and Flow in Tidal Inlets
Equations are derived to describe the water motion in a tidal inlet connecting the ocean with a relatively small basin. The boundary conditions considered are the ocean tide and fresh...

Phreatophytes - Water Use and Potential Water Saving
Salvage of water consumed by phreatophytes of low economical value has long been considered, and increasing emphasis is being placed on this source of water in the arid and semiarid West....

 

 

 

 

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