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(a)
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7 NETWORK BOUNDARY
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(b)
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MILES
Fig. 1—Sampling networks in 1962. (a) East Central [linois network
and (b) Kaskaskia and Boneyard networks.
diameter orifices. The galvanized buckets were coated with a plastic
paint to reduce possible contamination. The buckets were washed with
water from a pressure sprayer twice weekly on a routine basis and,
occasionally, more frequently during periods of sample collection. On
the Kaskaskia and the Boneyard networks, polyethylene containers with
a catch area of approximately 300 sqin. were placed by each rain gauge
to collect rainwater Samples since the rain gauges had 8-in. instead of
12.6-in. orifices. On these small networks the rainwater samplers
were thoroughly cleaned shortly before each storm.
The
1963
sampling networks are shown in Fig. 2. The outer
border encompasses an area of 6000 square miles containing 16 auto-