1. Fractures can increase flow greatly in aquifers

2. FRACTURE
CONVERGENCE

3. Edwards Aquifer Area Cross-Section
EDWARDS PLATEAU
HILL COUNTRY
GULF COASTAL PLAIN
Edwards T r i n t y G o u p E d w a d s T r i n t y
Balcones fault zone G o u p
Groups
Midway Group D e l R C a , B E g F A
Trinity Group
Edwards Group a n d N v r o G u p s
Catchment area E w T i t y L m e ,
Wilcox and Claiborne H S h l A B
Group
Recharge
Zone
Artesian
Zone G r o u p
Edwards Aquifer Area
Cross-Section

4. KARST OVERVIEW
In the subsurface these conduits feed into each other; dendritic patterns common
Larger conduits formed
Large volumes of water transmitted with high flow velocities

5. Veracruz, Mexico