. Bulletin. Natural history; Natural history. Am Temperature — Water TCmpcrature. St IS SuUtVAM l3HtLtYviut I Co^ti^ I I fuTl I Pout 1 Cwiyli I Ijn/y i i 1 • » M II 12 1} H 19 Ifc 17 IS l> 20 Zl 22 a U a 24 i^ Z8 2? V/EtilDV , IntwATmm 3li i i 4 i i 1 • » M II 12 1} H 19 14 17 IS \f 20 Zl 22 Zi i^ H 24 2T 28 2? }0 }l i~? i A 3 -AUGUST SEPT. Fig. 4.—Air and water temperatures on the Kaskaskia in the summer of 1929. is much less, varying from a maximum of 55 feet in 18 miles through Moultrie county to the low gradient found in St. Clair county where the fall is only 10 feet in 20 miles. As a
. Bulletin. Natural history; Natural history. Am Temperature — Water TCmpcrature. St IS SuUtVAM l3HtLtYviut I Co^ti^ I I fuTl I Pout 1 Cwiyli I Ijn/y i i 1 • » M II 12 1} H 19 Ifc 17 IS l> 20 Zl 22 a U a 24 i^ Z8 2? V/EtilDV , IntwATmm 3li i i 4 i i 1 • » M II 12 1} H 19 14 17 IS \f 20 Zl 22 Zi i^ H 24 2T 28 2? }0 }l i~? i A 3 -AUGUST SEPT. Fig. 4.—Air and water temperatures on the Kaskaskia in the summer of 1929. is much less, varying from a maximum of 55 feet in 18 miles through Moultrie county to the low gradient found in St. Clair county where the fall is only 10 feet in 20 miles. As a result of the stream's very low gradient and winding character, its rate of flow is quite slow after emerging from the Shelbyville moraine. Above Shelbyville, at least during periods of comparatively low water, there are stretches of quiet pools and riffles alternating with comparatively swift water, but below this point the stretches of rapid water occur less often and the stream has a slower and more nearly uniform flow. The graphs in Fig. 4 show the temperatures recorded while the field party was working on the Kaskaskia during the summer of 1929. The water temperatures were taken about 2 inches below the surface, well out in the channel of the river. The air temperatures were taken in the shade. The same thermometer was used for both. As one would expect, the graphs show that there is less variation in the water than in the air. Thus the water ranged from ^^ to 86^ F. while the air ranged from 61° to. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
