truction of Pompton reservoir, which would withhold all flood
waters from the northern tributaries. It would leave unprovided for 20.2
square miles on the Rockaway, 71.7 square miles on the Whippany, 46.2
square miles on the upper Passaic, and 83.7 square miles tributary to
the Central Basin and not included above.
Leaving Pompton reservoir out of consideration, and conserving flood
run-off on the Ramapo, Wanaque, and Pequanac rivers, there would be
absolute flood catchment up to a 12-inch run-off over 494.8 square miles
above Little Falls. This would leave 278.1 square miles unprovided for,
the run-off from which would not overburden the channel in the lower
valley, provided, of course, that channel were improved to a maximum
carrying capacity.
PREFERABLE RESERVOIR SITES.
The following table and discussion of preferable sites for flood
prevention are taken from the report of the engineering committee of the
northern New Jersey flood commission:
Table showing detailed facts regarding possible reservoir sites on
Passaic drainage basin.
KEY:
A: Area of watershed.
B: Area of reservoir.
C: Height of dam.
D: Length of dam.
E: Elevation of flow line.
F: Storage, watershed.
G: Storage capacity.
H: Total cost.
--------------+-----+------+-----+------+------+-------+-------+---------
Reservoir. | A | B | C | D | E | F | G | H
--------------+-----+------+-----+------+------+-------+-------+---------
| Sq. | Sq. |Feet.| Feet.| Feet.|Inches.|Million|
| mi. | mi. | | | | | c.f. |
Ramapo | 140 | 2.8 | 65 | 1,700| 280 | 5.5 | 1,768 | $900,000
Wanaque | 83 | 2.1 | 60 | 1,200| 275 | 7.7 | 1,491 |1,000,000
Newfoundland | 52 | 1.8 | 40 | 430| 780 | 8 | 966 |1,800,000
Rockaway | 114 | 4.6 | 28 | 470| 520 | 6 | 1,565 | 600,000
Millington | 56 | 15.8 | 25 | 220| 245 | 31 | 4,060 | 370,000
Great Piece | 773 | 37 | 21 | 1,500| 178.5| 9[C]| 8,950 |2,625,000
Mountain View | 380 | 13.4 | 42 | 2,150| 202 | 8 | 7,200 |3,340,000
Do. | 380 | 13.9 | 44 | 2,380| 204 | 9 | 7,900 |3,460,000
Do. | 380 | 14.3 | 46 | 2,470| 206 | 10 | 8,700 |3,590,000
Do. | 380 | 17.4 | 60 | 3,000| 220 | 17 |15,000 |5,260,000
--------------+-----+------+-----+------+------+-------+-------+---------
[Footnote C: Including water discharged through fixed open
|