مهلت تحويل 89/3/16
آدرس دريافت فايل سؤالات
Saturday, May 15, 2010
Friday, April 23, 2010
Monday, March 15, 2010
Tuesday, March 9, 2010
Specific yield
Specific yield, also known as the drainable porosity, is a ratio, less than or equal to the effective porosity, indicating the volumetric fraction of the bulk aquifer volume that a given aquifer will yield when all the water is allowed to drain out of it under the forces of gravity:
where
- Vwd is the volume of water drained, and
- VT is the total rock or material volume
|
| Specific Yield (%) | ||
| Material | Maximum | Minimum | Average |
| coarse gravel | 26 | 12 | 22 |
| medium gravel | 26 | 13 | 23 |
| fine gravel | 35 | 21 | 25 |
| gravelly sand | 35 | 20 | 25 |
| coarse sand | 35 | 20 | 27 |
| medium sand | 32 | 15 | 26 |
| fine sand | 28 | 10 | 21 |
| silt | 19 | 3 | 18 |
| sandy clay | 12 | 3 | 7 |
| clay | 5 | 0 | 2 |
| (Johnson (1967) as quoted by C.W. Fetter) | |||
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