What was measured at the Haddam rain garden? Click the following
links to read more:
Flow |
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Roof runoff and flow from underdrains
was measured using a tipping bucket device. Each tipper was calibrated
so that the volume is each tip was known. The number of tips was
then recorded manually and electronically with a datalogger. |
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Water Quality Sampling |
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Water quality sampling was conducted
passively through small PVC pipes. The pipes allow a small portion
of each tip to be captured. The water then flowed to pre-acidified
storage bottles in a refrigerator.
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Analysis |
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Samples were then collected weekly
and analyzed for nitrate-N, ammonia-N, total Kjeldahl-N (ammonia-N+organic-N),
and total-P on a Lachat colorimetric flow injection s. Monthly
composite samples were analyzed for total copper, lead and zinc.
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Soil Moisture |
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Soil moisture (%) was measured weekly at three depths in each rain
garden, using a Moisture Point TDR probe.
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Redox Potential |
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Redox potential (mv) was measured weekly at two depths using platinum
electrodes and a millivolt meter.
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Precipitation |
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Precipitation was measured electronically and with a non-recording
gauge. It was also sampled for quality.
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Frost Depth |
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A frost tube was constructed and installed
in each garden (Ricard, et al., 1976). Frost depth was measured
in each garden weekly.
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Plants/Mulch/Soil |
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Five chokeberry (Aronia prunifolia) shrubs, and four each
of winterberry (Ilex verticillata) and compact inkberry (Ilex
glabra compacta) were planted in each garden. A hardwood bark
mulch was applied as a ground cover. The plants, mulch and soil were
sampled at the beginning and end of the study for metals, total N,
and total P.
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Temperature |
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Temperature of roof runoff and underdrain outflow was
monitored continuously using the Campbell Scientific CR-10 datalogger
and temperature probes.
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