POOL STAGE FREQUENCIES

SURRY MOUNTAIN DAM  

Ashuelot River, New Hampshire

 (D.A. = 100 square miles)

(1936, 1938, 1943 - 2002)

FREQUENCY

POOL STAGE

STORAGE

(yr)

  2

  5

 10

 20

 50

100

200

 

(ft)

37.0

48.0

54.0

59.8

64.0

66.0

67.2

(acre-feet)

 9,500

17,000

21,700

26,950

30,700

32,700

33,800

 

(inches)

1.8

3.2

4.1

5.1

5.8

6.1

6.4

 

(percent full)

 30

 54

 60

 84

 97

100+

100+

     NORMAL POOL LEVEL = 15.0 ft.

     SPILLWAY CREST = 65.0 ft.(70-yr Freq)

     GATE INVERT =  485.0 ft-NGVD