14 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
tian, at an elevation of 140 feet, it has a bed 125 feet wide, a current of 4 feet per 
second, and a volume of 100 second -feet. At its mouth it is only about 60 feet wide 
and has a slow current. The bottom is soft mud and sand. 
Rio Anasco. — This is of somewhat larger size, with its headwaters on the divide 
west of Adjuntas, and enters the sea north of Mayaguez. One of its tributaries, the 
Rio Yahueea, was examined by Mr. Wilson at an elevation of 1,440 feet, 5 miles west 
of Adjuntas, where the minimum discharge was 20 second-feet. The Rio Blanco, into 
which the Yahueea flows, at an elevation of 1,350 feet, about 8 miles west from 
Adjuntas, has a minimum flow of about 50 second-feet. The Anasco River, at a 
point about 8 miles above the town of Anasco, at an elevation of 80 feet, has a bed- 
width of 150 feet, a surface-width of 75 feet, a depth of 1.5 feet, and a volume of 
about 600 second-feet. Below Anasco this river flows through a level playa and has 
an easy meandering course, its grade being low and the current slow. Its surface- 
width here is about 200 feet, the depth 4 to 8 feet, and the flow about 1,000 second-feet. 
Rio Ya/aco. — This small stream rises among the hills north of Yauco and enters 
the sea near Guavanilla. It was seen near Yauco, where it is only a few yards wide 
and has a small volume. It is used to some extent for irrigation purposes. 
Rio Portugues. — This stream at Ponce has a bed-width of 175 feet and a dis- 
charge of 60 second-feet. Its total available discharge is much greater, but the 
major part of it is diverted a few miles above the city for irrigation purposes and 
for the water-supply of Ponce. 
The Rio Jacaguas , which is crossed by the military road at Juana Diaz at an 
elevation of 160 feet, has a width of 180 feet, a minimum surface-width of 50 feet, 
and a discharge of 50 second-feet. The discharge would be greater, but a portion is 
used for irrigation purposes above the military road. 
Rio Descalabrado. — This is a small stream crossing the military road between 
Juana Diaz and Coamo, where it has an elevation of 260 feet, a comparatively dry 
bed 120 feet wide, a 2-foot current, and a discharge of 40 second-feet. 
Rio Coamo. — This river has its sources in the Sierra de Cayey and the Cor- 
dillera Central south of Aibonito and Barranquitas, and flowing southward, enters 
the sea east of Ponce. At Coamo the bed of the stream is 360 feet above sea level, 
and has a bed-width of 100 feet, though its surface-width is somewhat less. Its 
average depth was about 4 inches and the flow about 100 second-feet. 
Rio Guamani. — A small stream rising in the Sierra de Cayey north of Guay am a 
and flowing southward by that town into the sea just east of Jobos Harbor. It is 
crossed by the military road just west of Guayama, where it is a small creek, a few 
feet wide and a few inches deep. 
Rio Naguabo. — This small river rises on the south slopes of El Yunque and has 
its mouth near Hucares. Below Naguabo it is sluggish, with mud bottom. 
Rio Fajardo. — The Fajardo River rises in the Sierra Luquillo and flows north- 
cast into the sea at Playa de Fajardo. Just south of Fajardo, where it was examined, 
it flows through a low, level plain, with cane fields on either side. The bed is several 
yards wide and made up of coarse gravel or larger rocks. J ust above the ford the 
bed was considerably wider than the water surface. The current was about 5 feet 
per second, and the average depth 2 feet. The water was clear and apparently pure. 
At its mouth it is deeper and much wider and rather muddy. Its banks are low and 
