Well Drawdown Simulator

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No wells added yet.
Click "Add Well" then click the map, or enter coordinates manually.

No areas defined yet.
Draw an area polygon to define aquifer zones with soil layers.

Scenario Guidance

Analysis Time

hours

Analysis Points

No points added.

Bounding Box Analysis

Draw a rectangle on the map to analyze.

Charts

Drawdown vs Distance

From well

Max radius ft

Drawdown vs Time

At point

Max time hrs

Chart

Click on the map...

Hover over map for coordinates

Add Well

Well Name

Well Type

Latitude

Longitude

Total Well Depth (ft bgs)

Casing Diameter (inches)

Static Water Level (ft bgs)

Pumping Rate (gpm)

Pumping Duration (hours)

Well Efficiency (%)

Associated Aquifer Area

The aquifer parameters (T, S) from this area will be used for drawdown calculations.

Notes

Pump Test Records 0 tests

Configure Area

Area Name

Color

Soil/Aquifer Layers (top to bottom)

No layers defined. Add at least one layer.

Effective Parameters: |

Add Layer

Preset Formation

Layer Name

Aquifer Type

Thickness (ft)

Hydraulic Conductivity K (ft/day)

Storativity S (confined)

Specific Yield Sy (unconfined)

Transmissivity for this layer: -- ft²/day

New Well Defaults

These values are pre-filled when adding a new proposed well.

Min Pumping Rate (gpm)

Standard Depth (ft)

Casing Diameter (in)

Well Efficiency (%)

Pumping Duration (hrs)

Fallback Transmissivity T (ft²/day)

Used when a well has no associated area with layers defined.

Fallback Storativity S

Hydrogeology Unit Converter

Enter a value in any field — all other units update automatically. Click to copy a value to the clipboard.

Hydraulic Conductivity (K) — used directly as K in layer inputs

ft/day app input

m/day

m/s

cm/s

ft/s

gpd/ft²

Typical ranges: Gravel: 300–3,000 ft/d • Sand: 3–300 ft/d • Silt: 0.03–3 ft/d • Clay: <0.03 ft/d

Transmissivity (T) — or compute T = K × b below

ft²/day app input

m²/day

m²/s

gpd/ft

ft²/min

Quick T = K × b Calculator

K (ft/day)

b — thickness (ft)

= T (ft²/day)

Pump Test Data —

Select a test from the left panel, or create a new one.

Test Date

Test Pumping Rate (gpm)

Pre-test Static WL (ft bgs) (blank = use well SWL)

Notes / Source

Observations

Time (hr)	Observed WL (ft bgs)	Obs. Drawdown (ft)	Model Drawdown (ft)	Residual (ft)
No observations yet — click Add Row.