282 Kansas Academy of Science. 



tank sewers and from house roofs, as is plainly shown by the rapid 

 rise in the flow-diagram curves whenever it rained while the ga- 

 gings were being taken. As the main outflow sewer empties into 

 the Kaw river below the surface of the water, it was necessary to 

 make the gagings in manholes. The apparatus used consisted of 

 a right-angled triangular weir placed in the sewer, and a device for 

 continuously recording the head of the water above the weir. The 

 recording device was placed three feet from the weir, on the up- 

 stream side. The weirs were gaged in the hydraulic laboratory 

 of the Kansas State University, with the water admitted in a man- 

 ner similar to the way that it would reach the weirs in the sewers. 

 The weirs were placed in the sewer where that leaves the manhole. 

 A bicycle tube was used for packing around the weirs. When in 

 place the bicycle tube was pumjjed full of air and made a water 

 tight joint. The apparatus that recorded the height of the water 

 consisted of a cylinder about four inches in diameter and twelve 

 inches long, which was run by a clock. A pencil fastened to a rod 

 extending up from the float recorded the height of the water over 

 the weir on a record sheet placed around the cylinder. 



The records were then reproduced on drawing paper by tracing 

 them over carbon paper, so that each day's curve was superimposed 

 on all preceding curves. From the entire series of plotted curves 

 a single curve representing a general average could be inferred 

 graphically. Individual curves show a number of small fluctua- 

 tions, probably due to the emptying of flush-tanks. Some large 

 fluctuations, due to a weekly emptying of a large swimming-pool, 

 showed both the accuracy and sensitiveness of the recording appa- 

 ratus. The following results were obtained : 



The maximum rate of flow for the main outflow sewer and the 

 Connecticut Street sewer were, respectively, 206 gallons and 226 gal- 

 lons per capita per day, but as these were during heavy rains, they 

 do not mean much in this work. 



The maximum dry-weather rate of flow for the main outflow 

 sewer was about 130 gallons per capita per day, and occurred be- 

 tween nine and ten o'clock a. m. The minimum rate of flow for 

 the main outflow sewer was 56 gallons per capita per day, and oc- 

 curred at about four o'clock A. M. 



The maximum dry-weather rate of flow for the Connecticut 

 Street sewer was about 150 gallons per capita per day, and occurred 

 between eight and nine o'clock A. M. 



The average rate of flow for the Connecticut Street sewer was 82 

 gallons per capita per day. The average rate of flow for the main 

 outflow sewer was 85 gallons per capita per day. 



