Structural

2 calculators

BS 8007 Crack Width

Design crack width for flexural cracking in water-retaining concrete structures per BS 8007 / BS 8110.

Eurocode Crack Width

Characteristic crack width per EN 1992-1-1 §7.3.4 for reinforced concrete sections in bending.

Pipe Flow

4 calculators

Flow

Solve Q = A·V for pipe flow. Enter any two of discharge, velocity, or diameter.

Head Loss

Friction head loss in pressurised pipes using Darcy–Weisbach with Swamee–Jain friction factor.

Hazen–Williams

Friction head loss for water in pipes using the empirical Hazen–Williams formula.

Reynolds Number

Classify flow as laminar, transitional, or turbulent.

Minor Losses

6 calculators

Entrance Loss

Head loss at the entrance from a reservoir/tank into a pipe.

Exit Loss

Head loss at pipe exit to a reservoir (full velocity head lost, K = 1).

Sudden Contraction

Head loss for abrupt pipe contraction from D1 to D2.

Sudden Enlargement

Borda–Carnot loss for sudden pipe enlargement.

Gradual Contraction

Head loss for a conical reducer based on cone half-angle.

Gradual Enlargement

Diffuser head loss based on cone angle and area ratio.

Pumps & Pipes

3 calculators

Pump Power

Required pump shaft power for a given discharge and total head.

Water Hammer

Pressure surge from sudden valve closure for rigid and elastic pipes.

PE 100 Cost

Material cost estimate for HDPE PE 100 pipe based on outer diameter, pressure rating, and current Nepal market rate per kg.

Water Supply

6 calculators

Population Forecast

Forecast design population using arithmetic, geometric, and incremental increase methods.

Per Capita Demand

Total water demand including domestic, commercial, institutional, fire, and losses. Nepal default 135 LPCD.

Slow Sand Filter

Filter bed area for a slow sand filter from design flow and filtration rate.

Rapid Sand Filter

Filter bed area and number of beds for a rapid gravity sand filter.

Chlorine Dose

Mass of chlorine or bleaching powder required per day for disinfection of a water supply.

Detention Time

Hydraulic detention time in a tank or basin for a given volume and flow.

Open Channel

1 calculator

Manning's Flow

Flow in open channels (rectangular, trapezoidal, circular) using Manning's equation.