How geology and soil will influence in hard rock aquifer?
Geo-Structure model and Lineaments detected from drastic modeling control the behavior of groundwater flow...........
thanks
The question is unclear. Whether you want to know the usefulness of DRASTIC model in fractured aquifer or the importance of Geology & soils in hard-rock aquifer ?? Anyway I have attached a technical report, which may be of some use to you.
A fractured medium (aquifer, stricto sensu, or water bearing media), whether regionalized, or arranged in lineaments, often implies a higher hydraulic conductivity relative to the same non-fractured geologic media. This property may then increase well over an order of magnitude. In case of lineaments, these may have considerable effective hydraulic lateral extent, more than the "line" on a map. Having this in consideration, the "hydraulic conductivity" factor in the calculation of the DRASTIC model may be adequate. Many of the shortcomings of this model (just pinpoint a very few) lie in the deficits of the database, mainly regarding the factors that require suitable fieldwork at a suitable scale/spacial resolution.
I recommend reading carefully the seminal work by Aller et al. (1987) and later discussions, and build a previous detailed and well discussed hydrogeologic conceptual model, the abc of any hydrogeologic reasoning.
Great success in your work.
Manuel Abrunhosa
Soils, depending on its texture and mineral composition, will be permeable or not so permeable or impermeable. If the soil is permeable and thick, then it will be much better in holding and transmitting water.
Geologically in hard rock regions, type of rock; extent of weathering; presence of fractures/joints/foliations, etc; control the water holding and transmitting properties.
Thanks for informative reply. Are there any standard norms to decide the weightage of DRASTIC parameters?