Questions tagged [groundwater]

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Would the subsurface event leading to tree death at West Tern Lake in Yellowstone be visible in thermal imaging?

The New York Times article It’s Warm and Stealthy, and It Killed Yellowstone Trees and Turned Soil Pale describes an even that took place over the past few decades where a small and well-defined ...
5
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0answers
63 views

Chloride and evaporation

I have a layered aquifer with water that contains high concentrations of calcium and sulfate (~400 mg/L Ca2+, ~1300 mg/L SO42-), at 50 cm below ground surface (bgs), 250 cm bgs and 300 cm bgs. The ...
4
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0answers
234 views

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics?

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics? I want also to understand the difference between the different storage coefficients (...
3
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0answers
123 views

Dolomite and calcite precipitation

In an engineered wetland, there is groundwater flow from an aquifer with a chemical composition that is rich in magnesium, calcium and sulfate. We are finding that the aquifer is consistently ...
3
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0answers
2k views

Radius of Influence - groundwater pump well

What is the best method for calculating radius of influence for a pump well in an unconfined aquifer? I know the aquifer transmissivity (T), storativity (S), pump rate (Q), aquifer thickness (b), ...
3
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0answers
88 views

Does perchlorate(rocket fuel) and jet fuel make the salt and ground water near Cape Canaveral dangerous?

I've gotten into paddle surfing and I'm looking for a place to live and surf. I've been looking at an buying a condo in Cocoa Beach because of it’s proximity to Orlando and Cocoa’s decent but ...
3
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0answers
62 views

How to integrate dry wells into groundwater level mapping automatically (inequality constraints on the interpolation)?

I'm interested in automating spatial interpolation of groundwater level measurements. I'm wondering if anyone knows a method for automatically taking into account things like dry wells, where I can't ...
2
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0answers
68 views

Best material for Piezometer tube in water well

I have a 150M deep borehole. We want to measure ground water level using a pressure sensor. I believe that it is best practice to make use of a Piezometer tube ...
2
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0answers
70 views

Approaches for estimating potential evapotranspiration for non agricultural landuse classes

We are studying the water balance of a small catchment close to Jaipur, Rajasthan India in a semiarid climate. About a quarter of the landuse within the catchment is agriculture, the rest is divided ...
2
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0answers
340 views

Linear Boussinesq Equation for groundwater flow in inconfined aquifer?

I was reading a paper (equation 1 in linked paper) where they used 'linearized Boussinesq' equation to model groundwater in unconfined aquifer. The linearized Boussinesq equation described in the ...
2
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0answers
272 views

What is difference between Riverbed conductance term and streambed leakance/retardation coefficient?

In literature some times to account for semi-pervious sediments at bottom of stream, streambed leakance also called retardation coefficient ($L$) is used. This is equal to the ratio of conductivity of ...
1
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0answers
21 views

The DRASTIC groundwater vulnerability model and it's relevance today

I am reading a groundwater pollution vulnerability study by Mark Angle of the Ohio Dpet. of Natural Resources (ODNR) for my county. The model used to assess the groundwater vulnerability for the ...
1
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1answer
280 views

Why do we consider hydrostatic pressure and lithostatic pressure separately?

In petroleum geology, why do we consider hydrostatic pressure and lithostatic pressure separately? Surely the pressure at any point, whether fluid or rock, at depth is simply equal the weight of all ...
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0answers
45 views

Pyrite oxidation

How much pyrite has to be oxidized to produce a sulfate concentration of 15 mM? If the solution initially has a pH of 8, roughly what would the pH drop to if there is no buffering of acidity?
1
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0answers
18 views

What models are available to estimate effect of surface water on groundwater quality?

I want to determine the effect of surface water quality or the effect of chemicals used on surface like fertilizers on groundwater. What choices do I have for predicting groundwater quality? What are ...
1
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0answers
51 views

Modelling the unsaturated zone in FeFlow in seawater intrusion scenarios

Does anyone have experience with modelling seawater intrusion scenarios in Feflow? In my models, my mass-concentration seems to drive up into the unsaturated vadose zone, which I don't believe is ...
1
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0answers
105 views

Groundwater “GMS-MODFLOW” Transient Model

I have transient model with domain 200*200m and consists of 5 layers with 45 stress period, first layer is alluvium and the other 4 layers are weathered rock will be solved using traditional MODFLOW ...