Embed Size (px)
Citation preview
Allan R. Standen LLC, PG
Michelle A. Sutherland LLC, PE
Problem;
Groundwater districts need to be able to easily access the District’s groundwater data to make daily, permit and long-term aquifer management decisions.
Proposed Solution;
Detailed interactive 3D hydro-stratigraphic county-wide model using a provided software module. Module has easy to use tools to investigate;
formation and aquifer surfaces within the District,
depth to top of aquifers,
identify aquifer production zones,
monitor water levels and DFCs,
estimate aquifer volumetrics,
etc. ???
Interactive 3D Models
A interactive 3D hydro-stratigraphic model has been completed for the Clearwater Underground Water Conservation District in 2014.
A Middle Pecos Groundwater Conservation District 3D hydro-stratigraphic model will be completed by April 2015.
Four to five interactive 3D hydro-stratigraphic models (portions of 12 counties) for the Texas University Lands to be completed by December 2015.
Surface Geology
CUWCD water well driller’s reports and TDLR water well driller’s reports (339 wells)
BEG driller’s reports (cable tool), oil, gas and water, scout tickets and TCEQ water well driller’s reports (78 wells)
BEG geophysical logs (37 wells)
TWDB water well driller’s reports (33 wells)
Each well has been assigned a unique tracking number – key for looking at well data in the report tables and model
Initially reviewed over 2,000 wells
Selected wells with best location, well information and geologic descriptions (picks)
All data entry was confirmed for accuracy
Total of 487 wells used to construct 3D Model
Well Data
Reviewed all of the TWDB’s historical water level data, 1950s through 2000s
Only the 1960s decade contained sufficient geographic distribution of water levels used for comparison with present water levels
1960s Water Levels
2012-2014 Water Levels obtained from CUWCD and TDLR wells
Piezometric surfaces were created for the Edwards, Glen Rose (Upper Trinity), Hensel (Middle Trinity) and Hosston (Lower Trinity)
These may provide the District with reference DFC water level surfaces
Total Dissolved Solids (TDS)
Del Rio (distinguishable clay surface)
Edwards – Comanche Peak (above Walnut)
Glen Rose (below Walnut, localized Paluxy)
Hensell (first major sand interval)
Hosston (second major sand interval)
Too few and poor geographic distribution of wells with adequate descriptions of sand intervals in driller’s reports and geophysical logs.
Created a sand isopach from top and base of Hensell
Even less data for Hosston, few water wells penetrating full thickness – therefore no net sand isopach
Uses;permit
evaluation, determine aquifer,
water level changes
Better understanding of aquifer complexity and geospatial distribution and water level changes.
District staff to provide depth to top of aquifer or selected formations to assist drillers or local residents.
District staff to make cross-sections through the model at any orientation to assist in permit applications or understanding of local subsurface geology.
District staff to provide selected well information used in 3D model
3D visual imagery improves communication between staff, board and public
