SANITARY survey: OF DRAINAGE BASIN OF POTOMAC RIVER. 247 
Since the introduction of the water supply there has been a marked 
reduction in the amount of t}^hoid which used to occur every year. 
Riverton is a small place-which lies in the fork of the Shenandoah. 
The North Fork is polluted here by the drainage from a duck farm and 
from several privies along its edge. The North Fork has on it several 
towns from which it receives, however, but little if any serious 
pollution. 
About 25 miles below Riverton the Shenandoah is joined by Lewds 
Run. On this Run is Berry ville, Va., the county seat of Clarke 
County. Berryville is 75 miles from Great Falls and in 1900 had a 
population of 938. The town boasts of a public water supply derived 
from mountain springs. There is no sewerage. The underlying 
limestone, fissured and seamed, drains the cesspools wliich, on that 
account, require no attention. The run is polluted, however, by some 
nearby privies. 
On account of the fine water supply typhoid is said to be of com- 
paratively rare occurrence. It is to be regretted that no data are 
available showing the degree of reduction in the t}q)hoid rate. 
Charlestown, W. Va., the county seat of Jefferson County, is on Evitt 
Run, a small tributary of the Shenandoah, 57 miles above Great Falls. 
In 1900 it had a population of 2,392. It has a public water supply 
from a spring 1 mile from town. A few wells are still in use. There 
is no sewerage, so cesspools and privies are common ; the former, 
like those in BeriA^ville, drain themselves, while some of the latter 
are on the edge of the run and drain into it. A few cases of typhoid 
occur every year. There were more than the average number last 
fall, but definite figures are unobtainable. 
Halltown, W. Va., a small village 57 miles from Great Falls, pollutes 
Flowing Spring Run, a tributary of the Shenandoah, by some privies 
on its edge. Typhoid fever appears to be rather prevalent in and 
about this place. 
Leaving Harpers Ferry and proceeding down the Potomac, now 
augmented by the waters of the Shenandoah, we come in succession 
to Sandy Hook, Weverton, Knoxville, and Brunswick. Of these, 
Sandy Hook and Weverton are insignificant in size and would be 
also in importance but for their situation on the bank of the river and 
their proximity to Great Falls, from which they are removed 44 and 
43 mdes, respectively. Privies are in common use and the surface 
drainage is into the canal and, through small runs, directly into the 
river. 
Typhoid fever is not of rare occurrence. 
Knoxville is 1 mile below Wevertoru In 1900 it had a population 
of 363. A creek vrhich runs through the town carries the filth from 
numerous overhanging privies directly into the river. Some typhoid 
occurs here every year. 
