1 / 29

GROUNDWATER

GROUNDWATER. GROUNDWATER. GROUNDWATER. Aquifer “Geologic unit that can store and transmit enough water to be a significant water resource” 1. Large volume (in relation to the amounts being removed annually) 2. Moderately high porosity 3. Facilitate easy movement of water toward a well

abra-barker
Télécharger la présentation

GROUNDWATER

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GROUNDWATER

  2. GROUNDWATER

  3. GROUNDWATER • Aquifer “Geologic unit that can store and transmit enough water to be a significant water resource” 1. Large volume (in relation to the amounts being removed annually) 2. Moderately high porosity 3. Facilitate easy movement of water toward a well • aquiclude

  4. GROUNDWATER • Confined versus unconfined

  5. GROUNDWATER

  6. GROUNDWATER

  7. GROUNDWATER • Elevation energy and pressure energy

  8. GROUNDWATER • Elevation energy and pressure energy

  9. GROUNDWATER • Potentiometric surface • Equipotential lines • Potentiometric contours

  10. GROUNDWATER

  11. GROUNDWATER

  12. GROUNDWATER

  13. GROUNDWATER • Vx = Q/A • Water potential (hydraulic) gradient: • Q = h/d

  14. GROUNDWATER • Q = A h/d • Q = K A (h/d) • Hydraulic conductivity (K) • “Permeability” • T = Kb • where b = aquifer thickness  

  15. GROUNDWATER

  16. GROUNDWATER

  17. GROUNDWATER

  18. GROUNDWATER • Storage properties of aquifers • In GW flow, S = 1 and  volume stored/unit volume = 

  19. GROUNDWATER • The volume of water a unit volume of aquifer releases in response to Dh = Specific storage, Ss Volume water released [L3] Ss = Volume of aquifer [L3] x Dh [L] Storage coefficient or storativity, S Volume water released [L3] S = Surface area of aquifer [L2] x Dh [L]

  20. GROUNDWATER S and Ss are related as S = bSs

  21. GROUNDWATER Unconfined aquifer: Specific yield (Sy) = sy = volume of stored GW released per unit surface area per unit decline of S = sy sy = bSs and Ss= syb

  22. Fc GROUNDWATER  = Sy + Sr

  23. GROUNDWATER

  24. GROUNDWATER

  25. GROUNDWATER

  26. GROUNDWATER

  27. GROUNDWATER

  28. GROUNDWATER

More Related