A thermocline is a band of water “in which temperature changes more rapidly with depth than it does in the layers above or below”1. Due to discontinuity in the acoustic impedance of water created by the sudden change in density, thermoclines can reflect active sonar and other acoustic signals. This is realized on fishing sonars and higher end fish finders as a thin band on the monitor2.
Boat fishermen and trollers in particular tend to target the area in or directly above the thermocline as this usually supports the most fish. This early in the year, no thermocline is visible on the sonar or at least it is indistinguishable from the surface clatter in the first 5 feet of surface water.
41 Degree Surface Temp. w/ Uniformly Cold water beneath.
So if you are looking for an early Spring thermocline you might be coming up blank, especially with this cold weather we have been having. As the weather warms though, expect to see a noticeable band on your sonar and expect it to get deeper and deeper as we move toward the summer.
The New Jersey Water Supply Authority has tentatively scheduled pumping operations from the South Branch of the Raritan River to the South Dam of Round Valley Reservoir. The anticipated period of operation is from April 8, 2011 thru May 8, 2011. Of course these dates are subject to unplanned circumstances. The pumping rate is expected to be approximately 80 million gallons per day (124 cfs).
Using today’s current reservoir level of 376.78 feet (48.98 billion gallons), the pumping operation is estimated to bring the final level to about 380.28 feet (51.38 billion gallons). This relates to about a 4.9% addition of river water to the present reservoir volume.
At capacity, the reservoir is 385.0 feet and 55.0 billion gallons.
In June of 2010 GZA GeoEnvironmental, Inc. completed a feasibility study for constructing a hydroelectric project at Round Valley Reservoir’s Hamden Pump Station for the NJ Water Supply Authority. “The Authority understands that there is potential to generate hydroelectric energy
utilizing flows that are discharged at or downstream of the Round Valley Reservoir South
Their assessment concludes:
“Based on the technical analyses presented in this report, it is GZA’s opinion that the
development of a hydroelectric project at Round Valley Reservoir, Hamden Pump Station
is technically feasible. Economic analyses indicate, however, that the likely return on
investment is not attractive at current energy prices.”
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Round Valley Reservoir Water Level
The table is updated daily and shows Round Valley Reservoir water volume by date. When the reservoir is full it is at roughly 382.5 feet in elevation and roughly 55Billion Gallons in volume. Check Round Valley Reservoir water level now.
CELEBRATE SPRING’S ARRIVAL AT THE PEQUEST TROUT HATCHERY OPEN HOUSE
The New Jersey DEP’s Division of Fish and Wildlife will hold its annual Open House at the Pequest Trout Hatchery and Natural Resource Education Center on Saturday, April 2 and Sunday, April 3 from 10:00 a.m. – 4:00 p.m. daily. Admission is always free, as is parking.
The Open House is held the week before the start of New Jersey’s Opening Day of Trout Season and gives visitors the opportunity to see how hundreds of thousands of brook, brown and rainbow trout are raised for stocking at favorite fishing spots throughout the state. More than 570,000 trout raised at Pequest will be stocked during the spring, with at least 180,000 available for anglers by Opening Day.
Back by popular demand as a feature attraction at this year’s Open House is the Hog Trough. This gigantic mobile fishing tank holds thousands of gallons of water and will be loaded with monster trout and warmwater game fish from the Pequest and Hackettstown hatcheries. The youngster with the closest weight estimate of Bubba Trout will take home a donated trout rod and reel combo. Professional fishing demonstrations in the Trough are scheduled throughout the day. Visitors will see casting methods, learn effective fishing techniques and see how various lures work in the water. This is a fascinating exhibit for all ages, anglers and non-anglers alike!