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Figure 1: This figure depicts the
very first storm event recorded on July 7, 2004. The plot
shows precipitation data (blue blocks on secondary y-axis) and
the depth of water within the infiltration trench (dark blue
line primary y-axis).
Picture 1: Picture
of the July 7 2004 storm event showing the inflow box open,
and water seeping upward through the EP Henry Eco-Pavers.
Figure 2: The data
plot for the July 7, 2005 storm event. This graph depicts the
depth of water within the trench along with the rainfall depth
over time. This is a typical way to evaluate the storm
characteristics and the performance of the infiltration
trench. Notice how the infiltration rate decreases as the
water level within the trench decreases.
Picture 2. This is
a picture of the flow during the July 7 2005 storm event and
the flow over the V-notch weir located at the entrance of the
trench. Notice that the inlet pipe has been shortened and
additional baffles have been added as compared to the picture
above. The shorter pipe and additional baffles provided a more
stable flow entering the trench. It also should be noted that
no water was seeping upward from the EP Henry Eco-Pavers
during this event.
Picture 3: Another
view of the flow through the inlet box and the V-notch weir
for the July 7 2005 storm event.
When comparing the
storms a year later major differences in trench performance
can be seen from the above figures and pictures. Most notably,
the overall performance and infiltration rates within the
trench have changed drastically over the course of one year
(2004-2005). In
Figure 1 (2004), all of the water within the infiltration
trench percolates into the ground in 4 hours for a 0.43 inch
rainfall event. In comparison, for the
Figure 2 storm event (2005) all of the water within the
infiltration trench percolates into ground in roughly 50 hours
for 2.2 inch rainfall event. |
