out 140 square miles in extent, the country for the most part
being quick-spilling and upland. By constructing there a dam 700
feet long and 65 feet high a reservoir with a water surface of 2.8
square miles would be afforded, the flow-line elevation being 280
feet above tide. The capacity of such a reservoir would be
1,768,000,000 cubic feet, equal to about 5.5 inches on the drainage
area.

WANAQUE SYSTEM.

Near the headwaters of Wanaque River is Greenwood Lake, a large body of
water described in Water-Supply Paper No. 88. Its value as a flood
catchment basin is somewhat uncertain, as it is used as a storage feeder
for Morris Canal. The surface level of this lake is controlled by gates,
which naturally are operated by the canal authorities for the benefit of
the canal. Therefore it is the object to store as great a volume of
water as possible, and the water falls below the dam crest at the outlet
of the lake only when the dam opens in dry seasons and makes it
necessary. Under such conditions there is no certainty that storage
capacity will be available during the time of a great storm, and in fact
Greenwood Lake has been overflowing at the commencement of the storms
which caused both of the recent floods.

In view of the condition expressed above it will be necessary in
providing for flood catchment in the Wanaque drainage area to omit
entirely from consideration the possibility of assistance from Greenwood
Lake. Below this point in the basin are several sites at which could be
raised dams, which would effectually retain a large proportion at least
of storm run-off. They may be described as follows:

_Midvale reservoir_.--By building a dam 60 feet high and 1,200 feet long
across Wanaque River near Midvale, a reservoir would be formed which
would have a water surface of 2.1 square miles and a capacity of
1,491,000,000 cubic feet. The drainage area above this site is 83 square
miles, and the storage capacity would therefore be equal to about 7.7
inches on the drainage area. The construction of this project would
involve the relocation of about 4-1/2 miles of the New York and
Greenwood Lake Railroad; the damages apart from this would be nominal,
the cost of the entire reservoir construction being about $1,000,000.

_Ringwood reservoir_.--Ringwood Creek runs through a gorge about 1 mile
above its confluence with the Wanaque. Above this is a well-defined
basin. A dam about 70 feet high an