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Frequently Asked Questions (FAQs)

What is this funding opportunity?

This is a discretionary cooperative agreement offered by the U.S. Geological Survey (USGS) through the South Florida/Caribbean Cooperative Ecosystem Studies Unit (CESU). The work centers on improving scientific and management understanding of groundwater movement in the Biscayne aquifer by building a more accurate, field-tested hydrogeologic framework.

What is the main purpose of the project?

The core purpose is to develop a more reliable hydrogeologic framework that explains groundwater flow through a complex karst limestone system that behaves as a dual-porosity aquifer. The framework is intended to directly support improved numerical groundwater simulations used for Greater Everglades restoration planning and related water-management decisions.

Which aquifer and region are the focus of the work?

The project focuses on the carbonate Biscayne aquifer in South Florida, particularly across the transition zone between the Everglades wetlands and Biscayne Bay.

What specific groundwater-flow issues is the project trying to address?

The work targets the challenge that karst aquifers can have highly variable permeability concentrated in discrete zones. A central aim is to identify and map different porosity and permeability types, especially preferential flow pathways created by karst features, so that groundwater flow can be represented more accurately in conceptual and numerical models.

What does "dual-porosity aquifer" mean in the context of this opportunity?

In this opportunity, the Biscayne aquifer is described as behaving as a dual-porosity system where groundwater flow can occur through both the rock matrix (slower, distributed flow) and faster preferential pathways or conduit-like zones associated with karst features. This dual behavior makes the aquifer difficult to represent with conventional modeling approaches.

Why is karst geology important to this work?

Karst features can create preferential flow pathways that strongly control where and how groundwater moves. Because permeability may be concentrated in specific karst zones, understanding their location, type, and continuity is critical for building a trustworthy hydrogeologic framework and for improving groundwater simulations.

What methods are expected to be combined in the project?

The opportunity emphasizes an interdisciplinary approach that integrates sequence stratigraphy, magnetostratigraphy, core analysis, and near-surface geophysics. The rationale is that no single method can adequately characterize a complex karst carbonate aquifer where permeability varies sharply and can be localized.

What role does sequence stratigraphy play in this effort?

Sequence stratigraphy is used to interpret depositional cycles and stratigraphic architecture. In this project context, it helps relate depositional patterns and stratigraphic units to aquifer structure, pore systems, and the distribution of permeability and preferential flow zones.

What is the role of core analysis in the project?

Core analysis supports interpretation of rock facies, pore structures, and other physical characteristics that influence porosity and permeability. These observations help define and ground-truth the hydrogeologic framework in actual subsurface materials.

What is meant by "near-surface geophysics" here, and why is it included?

Near-surface geophysics is included to help map and extend interpretations between boreholes. Because coreholes provide point-based information, geophysical data can help connect and spatially extend the framework in areas where direct sampling is not available.

Why is magnetostratigraphy described as a critical need?

The announcement identifies a critical need to verify continuity and correlation of mapped preferential flow zones and stratigraphic units using magnetostratigraphy. This matters because confidence in regional groundwater models depends on whether key units and flow zones are actually continuous and correlatable from one corehole to another, particularly in cyclic platform carbonate settings like the Biscayne aquifer.

What is magnetostratigraphy expected to contribute to the final framework?

Magnetostratigraphy is expected to strengthen correlations between coreholes using rock magnetic and paleomagnetic measurements. It is described as a way to test whether mapped flow zones and stratigraphic units extend between coreholes and to link stratigraphic cycles to aquifer architecture and the porosity/permeability patterns that control groundwater flow.

Are any special laboratory capabilities mentioned as necessary for the magnetostratigraphy work?

Yes. The opportunity notes that platform carbonates involved are weakly magnetic and that specialized laboratory capability is required, specifically a highly sensitive small-bore cryogenic magnetometer equipped with DC SQUID sensors.

How does this project relate to groundwater modeling for Everglades restoration?

The improved, field-tested hydrogeologic framework is intended to feed directly into improved numerical groundwater simulations used for the Greater Everglades restoration effort. The outputs are positioned as supporting restoration planning and policy by improving the conceptual hydrogeologic model used by Comprehensive Everglades Restoration Plan (CERP) decision makers.

What are the expected deliverables?

The expected deliverables are typical of a research-driven cooperative agreement and include laboratory analysis of collected samples, synthesis and analysis of resulting datasets, written reporting, and presentation of findings.

Is the output intended to be purely academic research?

No. While the work involves research and analysis, the opportunity explicitly positions the results as directly supporting restoration planning and decision-making by improving the conceptual hydrogeologic model used in management-relevant groundwater simulations.

Does the opportunity mention expanding the model beyond the initial study area?

Yes. The refined conceptual model is intended to be expanded geographically and made more detailed so that it can be used with greater confidence in groundwater simulations relevant to management.

How does this opportunity connect to new computational modeling approaches?

The announcement notes motivation tied to developing new computational modeling procedures for dual-porosity flow, particularly lattice Boltzmann modeling techniques under ongoing USGS-directed research. The project aims to provide better mapped and better correlated karst framework information needed to support credible dual-porosity modeling.

What is the funding amount for the expected award?

One award is expected totaling $125,000. The award floor and ceiling are both listed as $125,000.

Is cost sharing or matching funds required?

No. The opportunity states that cost sharing or matching funds are not required.

How many awards are expected?

The announcement indicates one expected award.

What is the assistance listing / CFDA number for this opportunity?

The opportunity falls under CFDA 15.808, U.S. Geological Survey Research and Data Collection.

Who is eligible to apply?

Eligibility is limited to organizations that are official participating partners of the South Florida/Caribbean CESU program, consistent with the CESU model of formal research partnerships that support federal resource management agencies with research, technical assistance, and education capacity.

What agency is offering this opportunity and through what program?

The opportunity is offered by the U.S. Geological Survey (USGS) through the South Florida/Caribbean Cooperative Ecosystem Studies Unit (CESU).

When was the opportunity posted and when did it close?

The opportunity was posted on October 30, 2008 and closed on November 7, 2008.

When was the opportunity archived?

The archive date listed is December 7, 2008.

Who is the contact for access or administrative questions?

The listed contact is Faith Graves, Contract Specialist, at 703-648-7356.