MARYLAIsD GEOLOGICxVL SURVEY 



209 



have not been pnblislied, l)nt from them the table of monthly dis- 

 charg-e has been prepared. In this last named table are the esti- 

 mated maximum, minimum, and mean flow of the river in cubic 

 feet per second for each month over which the record extends. Two 

 quantities shovni in this table may require explanation. In the 

 column marked "Second-feet per Sq. Mile" are the estimated mean 

 run-off from each square mile in the basin for each month, assuming; 

 that every small portion of the drainage area yields its proportionate 

 part of the total flow. This quantity is obtained by dividing the 

 mean discharge in second-feet by the area of the drainage basin. 



In the column marked "Depth in Inches" is given the depth of 

 water in inches which would result if the total quantity discharged 

 by the river in the mouth were spread out over the whole drainage 

 basin. In Figure 3 is shown graphically the variation in the dis- 

 charge of the river during the period over which the record extends. 



LIST OF DISCHARGE MEASUREMENTS OF PATFXEN'T RIVER, AT LAUREL 



Ao. 



Date. Hydfoijraphcr. 



1896. 



Sept. 18 E.G. Paul 



Nov 25 E. G. Paul 



1897. 



Feb. 11 E. G. Paul 



Fob 2.S A. P. Davis 



Mar. 12 E. G. Paul 



May 2.") E. G. Paul 



.lul'y l.S G. H. Matthes 



July 22 R. G. Paul 



Sept. 3 E. G. Paul 



1898. 



10. .Tan. 27 Paul & Matthes. 



11. May 19 E. G. Paul 



Gage Height. 

 Feet. 

 4.60 

 4.40 



5.40 



8.50 

 4.40 

 8.70 

 7.85 

 13.70 

 4.10 



5.80 

 4.90 



Discharge. 



Sec. Feet. 



161 



123 



1S4 

 612 

 155 

 734 

 539 

 6144 

 63 



359 

 221 



ESTIMATED MONTHLY DISCHARGE OF PATUXENT RIVER AT 

 LAUREL, FOR 1898. 



[DR.\IN.\GE AREA 137 SQUARE JflLES.] 



Month. 



Discharge in second-feet. 



Maximum. Minimum. ' Mean. 



January — 

 February. .. 



March 



April 



M ay 



June 



July 



August, 1-10. 



341 

 323 

 347 

 162 



630 



273 



255 



1,586 



94 



110 



90 



94 



78 



69 



6 



.56 



185 

 161 

 130 

 117 

 177 

 91 

 50 



Run off. 



Second- 

 feet per Depth in 

 square i inches, 

 mile. 



1.35 

 1.18 

 95 

 0.85 

 1.29 

 66 

 0.36 

 *1.9t» 



1.56 

 1.23 

 l.<i9 

 94 

 1.49 

 0.73 

 0.41 

 *2.29 



♦Estimated for whole month. 



