# wellHydraulics: Well Hydraulics In geotech: Geotechnical Engineering

## Description

These functions are used to calculate flow rate to wells (`wellFlow`), drawdown to wells (`wellDrawdown`), and hydraulic conductivity from pumping tests (`kPump`).

## Usage

 ```1 2 3``` ```wellFlow(k, H = NA, h0, hf, r0, rw) wellDrawdown(Q, k, H = NA, h0, r0, rw, r) kPump(Q, H = NA, h1, h2, r1, r2) ```

## Arguments

 `Q` flow rate into well `k` hydraulic conductivity of aquifer `H` thickness of aquifer `h0` initial total head in aquifer (before pumping) `hf` final total head in well casing (after pumping) `r0` radius of influence `rw` radius of well `r` radius of interest (for drawdown calculations) `h1` total head in farthest observation well (kPump `h2` total head in nearest observation well (kPump) `r1` radius from pumped well to farthest observation well (kPump) `r2` radius from pumped well to nearest observation well (kPump)

## Details

• Datum for total heads is the bottom of the aquifer.

• Note the following classifications of aquifers as unconfined, confined, or mixed (which start as confined prior to pumping and finish as unconfined after pumping is complete):

• For unconfined aquifers, H > h0 (or specify as NA) in wellFlow and wellDrawdown, and H > h1 (or specify as NA) in kPump.

• For confined aquifers, H >= hf in wellFlow and wellDrawdown, and H >= h2 in kPump.

• For mixed aquifers, H < hf in wellFlow and wellDrawdown, and H >= hf in kPump.

## Value

• `wellFlow` outputs the flow rate to the well (Q)

• `wellDrawdown` outputs a two-element list containing:

1. h = height of groundwater surface a distance r from the well

2. dd = h0 - h = drawdown of groundwater surface a distance r from the well

• `kPump` outputs the estimated hydraulic conductivity of the aquifer from the pumping test

## Author(s)

James Kaklamanos <[email protected]> and Kyle Elmy <[email protected]>

`hydraulicConductivity`

## Examples

 ```1 2 3 4 5 6 7 8 9``` ```## Example code for Flow rate to well wellFlow(k = 0.065, H = 10, h0 = 21, hf = 15, r0 = 20, rw = 2) ## Example code for Well Drawdown wellDrawdown(Q = 14.5, k = 0.065, H = 10, h0 = 21, r0 = 20, r = 2, rw = 2) ## Example code for Hydraulic Conductivity from pumping tests kPump(Q = 14.5, H = 10, h1 = 20, h2 = 16, r1 = 16, r2 = 8) ```

### Example output

```[1] 10.64214
\$h
[1] 12.82495

\$dd
[1] 8.175051

[1] 0.0399902
```

geotech documentation built on May 29, 2017, 11:52 a.m.