Online Tools & Calculators

Enter data from a constant-rate pumping test using the Cooper-Jacob straight-line method. This calculator estimates the key aquifer parameters needed for well design and groundwater modeling.

Pumping Rate Q (L/s)

Time to 1-log-cycle drawdown (min)

Drawdown at time t (m)

Aquifer Thickness (m)

Well Radius (m)

Aquifer Type

Transmissivity (T)83.3 m²/day

Hydraulic Conductivity (K)2.78 m/day

Storativity (S)2.4 × 10⁻⁵

Transmissivity ClassificationModerate

Influence Radius (approx.)283 m

Well Screen Slot Sizing Calculator

Determine the optimal screen slot size based on formation grain-size distribution.

Screen slot size is determined by the grain-size distribution of the water-bearing formation. Enter the D10 and D60 values from a sieve analysis to calculate the correct slot size using standard methods.

D10 grain size (mm) — 10% passing

D60 grain size (mm) — 60% passing

Formation Type

Screen Material

Uniformity Coefficient3.00

Recommended Slot Size1.0 mm (0.040")

Screen Open Area %~12%

Recommended Screen TypeContinuous slot (Johnson type)

Gravel Pack Required?Yes — 2x oversize recommended

Gravel Pack Sizing Calculator

Calculate gravel pack dimensions, material volume, and grain size for well completion.

Gravel packs are placed in the annulus between the well screen and borehole wall in unconsolidated formations. Proper sizing ensures sand-free operation while maximizing well yield.

Borehole Diameter (mm)

Screen Diameter (mm)

Screen Length (m)

Formation D50 Grain Size (mm)

Gravel Oversize Ratio

Gravel Density (kg/m³)

Annular Gap75 mm

Gravel Pack Diameter300 mm

Gravel Volume Required0.44 m³ (442 L)

Gravel Weight Required773 kg

Recommended Gravel D506.0 mm

Gravel Size Range3.0 – 9.0 mm

Borehole Volume Calculator

Calculate the annular space volume for grouting, gravel packing, and fluid calculations.

Accurate volume calculations are critical for grouting, gravel packing, and drilling fluid management. This calculator handles both circular and irregular boreholes.

Borehole Diameter (mm)

Casing/Screen Outer Diameter (mm)

Section Length (m)

Borehole Oversize Factor (%)

Nominal Annular Volume0.53 m³ (530 L)

Adjusted Volume (with oversize)0.61 m³ (610 L)

Volume per Meter26.5 L/m

Grout Volume (+10% contingency)0.67 m³ (671 L)

Reynolds Number Calculator

Determine the flow regime (laminar, transitional, or turbulent) in well screens, pipes, and aquifers.

The Reynolds number determines whether flow is laminar (Re < 1 in porous media, < 2300 in pipes), transitional, or turbulent. This affects well efficiency, head loss calculations, and screen design.

Flow Type

Flow Velocity (m/s)

Characteristic Length (m)

Kinematic Viscosity (m²/s)

Reynolds Number10.0

Flow RegimeLaminar (Darcy flow)

Darcy – Weisbach Friction Factor64.0 / Re

Implication for Well DesignDarcy’s law applies — standard well equations valid

Time of Travel Calculator

Calculate groundwater travel time for wellhead protection area delineation.

Time-of-travel (TOT) analysis determines how long it takes for a contaminant to travel from a point on the water table to the well. This is used for Wellhead Protection Area (WHPA) delineation under EPA guidelines.

Hydraulic Gradient (m/m)

Hydraulic Conductivity (m/day)

Effective Porosity (%)

Target Protection Time (years)

Darcy Velocity (q)0.050 m/day

Seepage Velocity (vs)0.200 m/day

Travel Distance365 m

WHPA ZoneZone II (5-year)

Area of Protection0.42 km²

Interactive Pump Curve Plotter

Visualize pump performance curves, overlay system curves, and find the operating point.

Enter your pump specifications and system parameters to generate interactive performance curves. The chart shows head vs. flow (H-Q), efficiency, power consumption, and system resistance. The operating point where pump and system curves intersect is highlighted.

Pump Type

Shutoff Head (m)

BEP Flow (L/s)

BEP Head (m)

Max Efficiency (%)

NPSH Required at BEP (m)

Static Head (m)

Pipe Friction Coefficient (K)

Pipe Length (m)

Pipe Diameter (mm)

H-Q Curve (Head) Efficiency Power (kW) System Curve NPSH Required Operating Point

Operating Flow—

Operating Head—

Efficiency at OP—

Power at OP—

BEP Flow12.0 L/s

System Curve at BEP—

Well Cost Comparison Tool

Compare 2–5 well configurations side-by-side with detailed cost breakdown and visual analysis.

Configure 2 to 5 wells to compare total costs, individual component costs, and cost-effectiveness. Add or remove wells dynamically to evaluate different scenarios before committing to a drilling program.

Lowest Cost —

Highest Cost —

Cost Range —

Best Value (₱/m) —

Component

Depth vs. Cost Sensitivity Analysis

Visualize how changing depth, diameter, formation, and location affects total well cost.

Explore the relationship between well depth and total cost. The chart shows cost curves for different formations and diameters, helping you understand cost drivers and find the most cost-effective configuration.

Chart Mode

Fixed Diameter (mm)

Fixed Formation

Fixed Location

Cost at 50 m—

Cost at 100 m—

Cost at 200 m—

Cost at 300 m—

Cost/m at 100 m—

Break-even Depth—

Well Screen Development Time Calculator

Estimate development duration, water volumes, and pump-out rates for different methods.

Well development removes fine particles from the screen area and surrounding gravel pack to maximize yield and minimize sand pumping. Development time depends on well geometry, formation type, and the method used. This calculator provides time estimates, water volume requirements, and stage-by-stage guidance.

Well Diameter (mm)

Screen Length (m)

Screen Open Area (%)

Gravel Pack Thickness (mm)

Formation Type

Development Method

Target Development Level

Number of Development Stages

Total Development Time—

Time per Stage—

Total Water Volume—

Avg Pump-Out Rate—

Annular Volume—

Development Efficiency—

Stage-by-Stage Breakdown

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Development Tips

Development should continue until turbidity drops below the target level and sand-free water is achieved. Over-development can damage the screen and reduce well efficiency.