OFFICE OF EXPERIMENT STATIONS. 709 



Drainage district No. 1 (Norfolk County), Newport News, Meherrin 

 River (Greenesville and Southampton Counties). 



The following projects for which this office has made surveys and 

 prepared plans are now under construction by landowners : 



Arkansas: Black River Levees' (Randolph County). Delaware: 

 Redden farm (Sussex County). Georgia: McRac farm (Telfair 

 County). Kentucky : Marrs farm (Henderson County). Maryland: 

 Bureau of Anim.al Industry farm (Prince George County), Princess 

 Anne Academy farm (Somerset County). Mississippi: Tuscumbia 

 River (Alcorn County), Walnut Grove plantation (Coahoma 

 Count}^), Rogers farm (Attala Countj^), Bolivar County drainage 

 district. Nebraska: Elkhorn River bench lands (Holt County). 

 North Carolina: Chadbourn drainage district (Columbus County), 

 Pantego drainage district (Beaufort County), Broad Creek drain- 

 age district (Beaufort County), Pender County test farm, Lyon 

 Swamp Canal, and Cape Fear River Levee (Pender and Bladen 

 Counties). South Dakota: Vermilion River drainage district (Tur- 

 ner {ind Clay Counties). Texas: Barstow district (Ward County). 

 Vermont: Morgan horse farm (Addison County). Virginia: Truck 

 experiment station farm (Norfolk County), Berkeley Swamp (Nor- 

 folk County). 



GENERAL TECHNICAL INVESTIGATIONS. 



Further investigations of run-off have been made in Arkansas, 

 Louisiana, Mississippi, Missouri, and Tennessee. These are for the 

 purpose of determining the maximum rate of flood flow to be con- 

 sidered in planning the drainage of wet lands and the protection of 

 areas from overflow by streams; to study the relation of run-off to 

 rainfall, topography, cultivation, character of soil, and size of water- 

 shed area; to examine the effectiveness of drainage systems that have 

 been constructed; and to determine proper values for coefficients 

 used in formulas for determining flow in ditches and natural water 

 courses. Some study has also been made of sedimentation in ditches. 

 Other investigations cover studies of the effectiveness of undordrains 

 in the so-called "buckshot" soils; the practicability of constructing 

 ditches by the use of dynamite; the methods practiced in reclaiming 

 tidal marshes in New England, Nova Scotia, and New Brunswick; 

 and the problems peculiar to the drainage of irrigated lands, such 

 as the movement of ground water and the reclamation of areas un- 

 derlaid by shale at shallow depth. Investigations have been made 

 of the size and operation of pumps for drainage; the construction, 

 location, and arrangement of the pumping plants; and the capaci- 

 ties of the pumps and the plants as affected by the rainfall, the 

 character of the soil, and the interior drainage system. 



DISSEMINATION OF INFORMATION. 



The assistance given by correspondence from the Washington office, 

 in reply to questions from all parts of the United States regarding 

 the solution of particular problems, is by no means inconsiderable. 

 The engineers also render assistance to individuals and drainage 

 districts by personal consultation regarding proposed plans. The 

 following are examples of this class of the work: 



