Groundwater remediation and treatment technologies by Nicholas P Cheremisinoff

By Nicholas P Cheremisinoff

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Deer Creek hydrographs separated by three methods and statistical data. 61 ' m i . . . I= m C US 4) 47- t x6 *of J i ,el _~e6 I ],,~x / ~6 ,, ^11 i1 ~ c 45 , Explanation / xe 7 ! 9 tgso i X 195l "0 c - o 1952 Number mO,r,J t l l r,Jltlnd~r mO~th. January--I IO 4j 0 c . . . | ! Io J _ . ~ ~ao i ~3 Base Flow, in Cubic Feet per Second Figure 2-12. Rating curve of mean groundwater stage compared with base flow of Beaverdam Creek, Maryland. Relationship Between Groundwater and Surface Water 63 Brandywine Creek basin in southeastern Pennsylvania, as illustrated in Figure 2-13.

On the other hand, shale is likely to contain a great number of joints that are both closely spaced and extend to depths of several tens of feet. Therefore, rather than being impermeable, they can be quit e transmissive. This is of considerable importance in waste disposal schemes because insufficient attention might be paid during engineering design to the potential for flow through fractures. In addition, the leachate that is formed as water infiltrates through waste might be small in quantity but highly mineralized.

Eventually, the water table may decline to the same elevation as a stream bottom, or even below it, at which time streamflow ceases except during periods of surface runoff. Following a period of recharge, caused either by infiltration of rainfall or seepage from a flood wave, the water table may again rise and temporarily contribute groundwater runoff. Figure 2-3 shows a generalized diagram of the hydrology of a stream during two seasons of the year. During the spring, the water table is high and the gradient dips steeply towards the stream.

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