BUREAU OF PUBLIC ROADS. 417 



of draining muck and peat soils Avere carried on in the State of 

 New York. 



The records of rainfall and run-off which have been kept con- 

 tinuously since 1910 in the prairie se( tion of Louisiana have been con- 

 tinued. These records are of great value, as they determine the per- 

 centage of the rainfall that must be removed, and therefore establish 

 the required capacity (,)f drainage plants. The manuscript was pre- 

 pared for a bulletin which will summarize the experiments made by 

 this division for determining the roughness coefficient in Kutter's 

 formula. These experiments were made in dredged ditches in Mis- 

 sissippi, Tennessee, Iowa, Xorth Carolina, and Florida. The manu- 

 script for a bulletin giving the results of an extensive study of the 

 flow of water in tile drains has also been completed. 



In accordance with an agreement with the Florida Agricultural 

 Experiment Station, cooperative experiments were conducted on the 

 farm of the experiment station at Gainesville, for the purpose of 

 determining the value of sewage irrigation for that type of soil. 

 Experiments were conducted at Vineland, N. J., with several new 

 types of spray nozzles and automatic irrigation sewage valves. 

 Numerous plans for small irrigation plants in the humid section have 

 been prepared and much assistance of an advisory nature rendered. 



Twelve investigations and reports were made during the first half 

 of the year, to the Capital Issues Committee, respecting projects for 

 which bond issues were proposed. 



RURAL ENGINEERING. 



FARM DOMESTIC WATER SUPPLY AND SEWAGE DISPOSAL. 



Seven field examinations were made of farm water system^', and 

 advice was given for improving them. 



Five rural septic tank installations were designed or the main 

 features outlined. 



Work was begun on the preparation of manuscript and illustra- 

 tions for a bulletin on " Simple Sanitary Conveniences for Farm and 

 Tenant Houses." 



Estimate of cost and specifications were prepared for a gravity 

 water system for a large farm establishment in Georgia. 



Data was compiled relative to garbage disposal and reduction, 

 plumbing systems, and sewer and pool cleaning machines. 



FARM STRUCTURES. 



There were prepared for general distribution working dra^vings, 

 and, in most instances, bills of materials for the following farm 

 structures: A granary, two rural gchoolhouses, four farmhouses, 

 throe bunk houses, two milk houses, standard cow manger, dairy barn, 

 poultry house, manure pit, roof and storm cellar, movable hog house, 

 Bclf-feeder for hogs, bull barn, breeding rack for cattle, and a small 

 garage. 



Plans were prepared for the plumbing and heating layout for the 

 proposed laboratory building at Arlington for the Bureau of Public 

 Koads. 



For other bureaus of the department drawings for the following 

 were prepared: Milk station, cheese factory and creamery for the 



