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    22 Waterfalls Hike at Ricketts Glen State Park

    July 28, 2017

    6th Annual Migration Fest at Lehigh Gap Nature Center

    July 28, 2017

    Lehigh Valley Sierra Club Meeting

    July 28, 2017

    Canoe and Bicycle along the Lehigh River

    July 28, 2017

    Lecture: 19th c. Suspension Bridges of John A. Roebling: The Relevance of Archival Research to Modern Engineering Practice

    March 6, 2017

    Routine Newborn Screening for Heavy Metals

    November 29, 2016

    Lehigh River Tributary

    November 26, 2016

    Morning Under the Osprey

    November 26, 2016

    Conservation Program Update

    November 26, 2016

    Next Bridge Meeting!

    November 10, 2016

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    Recent Posts

    6th Annual Migration Fest at Lehigh Gap Nature Center

    July 28, 2017

    Canoe and Bicycle along the Lehigh River between Allentown and Bethlehem

    September 16th

    12 noon to about 4 pm

    We will start at Keck (Canal) Park, Allento...

    Canoe and Bicycle along the Lehigh River

    July 28, 2017

    22 Waterfalls Hike at Ricketts Glen State Park

    July 28, 2017

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    Featured Posts

    Lausanne Tunnel

    October 16, 2016

    A meet up event on September 10th was coordinated by Tom Torres to visit an Abandoned Mine Drainage (AMD) site and Matt MacConnell (standing at right end of photo) led the entourage of 27 through the site. The visit was a working trip where water quality and flow measurements were made.

     

    The group split into groups and some measured ferrous iron concentration at the inlet and compared this to the ferrous iron at outlet (4.8 ppm --> 3.4 ppm) to determine how much was being removed. Another group used the rectangular weir to calculate flow through the wetland (1625 gal/min.) A third group used the water quality monitor to check dissolved oxygen levels across the iron settling wetland (40% at inlet, 60% at midpoint and 80% at outflow.) A fourth group downloaded flow data from the solar powered data logger to get flow profile information over the last 12 months.

     

     

    The wetland works by oxidizing soluble ferrous iron to insoluble ferric iron so increasing CO2 saturation levels in the water is key, as it is maintaining design flow (~1800 fpm) 

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