POOL STAGE FREQUENCIES

BLACK ROCK DAM

Branch Brook, Connecticut

(1955, 1971-2001)

(D.A. = 20.4 square miles) 

FREQUENCY

Pool Stage

STORAGE

(yr)

  2

  5

 10

 20

 50

100

500

 

(ft)

61.0

73.0

83.0

92.0

103.0

110.0

112.5

 

(acre-feet)

1,710

2,895

4,115

5,390

7,180

8,450

8,900

 

(inches)

1.6

2.7

3.8

5.0

6.6

7.8

8.2

 

(percent full)

  20

  34

  49

  64

  85

 100

  100+

 

    Permanent Pool Level  =  27 ft.

    Spillway Crest  =  110.0 ft. 

    Gate Invert  =  410.0 ft-NGVD