Demand and required flow
Peak, simultaneous or process flow with a stated basis.
Open step →System hub / Phase 1
Pumps, Pressure & Pipe Flow
Build the duty point in the right order: required flow, static head, delivery pressure, pipe loss, pump curve, power, suction conditions and operating cost.
Measured values describe the present system. Estimated values describe a planning assumption. Label both before comparing equipment.
9 tools3 guides5 references
The recommended sequence
Required flowStatic headRequired pressurePipe lossDuty pointPower & NPSH
Start with flow. A pump does not have one universal head or flow. It operates where its curve and the system curve meet.
Inputs to collect
Elevation and pressure
Gauge locations, elevation datum and target pressure.
Open step →Pipe path and fittings
Actual ID, length, material/roughness and duty flow.
Open step →Manufacturer curve points
Exact speed, impeller and fluid condition.
Open step →Suction conditions
Absolute pressure, temperature, level and losses.
Open step →Operating schedule
Input power, hours, tariff and maintenance.
Open step →Tools on the bench
Total Dynamic Head Calculator
Combine elevation, pressure and losses.
Use tool →Pipe Friction Loss Calculator
Compare Hazen–Williams and Darcy–Weisbach.
Use tool →Water Pipe Size & Velocity Checker
Screen velocity using actual internal diameter.
Use tool →Pump Power & Efficiency Calculator
Estimate hydraulic, shaft and input power.
Use tool →Booster Pump Duty Point Estimator
Define preliminary flow and boost head.
Use tool →Pump Curve Duty Point Comparator
Interpolate and compare up to three candidates.
Use tool →NPSH Available Calculator
Estimate suction head above vapor pressure.
Use tool →Pump Operating Cost Comparator
Compare energy and annual cost scenarios.
Use tool →Low Water Pressure Troubleshooter
Prioritize measurements and likely cause groups.
Use tool →Well & Borehole Pump Sizing Planner
Build a duty point from pumping level, pressure and losses.
Use tool →Well Yield vs Demand Checker
Compare sustained source production, daily demand and peak storage.
Use tool →Pressure Tank Sizing Calculator
Convert required run time into drawdown and nominal tank volume.
Use tool →Pump Short-Cycling Analyzer
Compare observed starts with a simple drawdown cycle model.
Use tool →Water Storage Tank Sizing Planner
Balance outage demand, refill, reserve and usable volume.
Use tool →Rainwater Harvesting Yield Calculator
Estimate roof collection after runoff and system losses.
Use tool →Rainwater Tank Days-of-Supply Simulator
Step through 365 days of monthly rainfall, storage and demand.
Use tool →First Flush Diverter Sizing Calculator
Convert a local diversion rule into required volume.
Use tool →Available Water Flow Test Calculator
Turn bucket or meter trials into a measured flow.
Use tool →Sprinkler Zone Capacity Planner
Check flow and pressure margins before grouping heads.
Use tool →Sprinkler Precipitation Rate Calculator
Convert discharge and layout to applied depth.
Use tool →Irrigation Runtime & Water Depth Planner
Plan runtime, cycles and applied volume.
Use tool →Drip Irrigation Flow & Zone Calculator
Total emitters and divide feasible zones.
Use tool →Irrigation Pump & Zone Matcher
Screen one pump duty condition against one zone.
Use tool →Sprinkler Low-Pressure Troubleshooter
Prioritize irrigation-specific evidence and next measurements.
Use tool →Water Softener Sizing Calculator
Estimate working capacity from measured hardness, use and reserve.
Use tool →Softener Salt & Regeneration Planner
Plan regeneration interval, salt, water and optional cost.
Use tool →RO Recovery & Reject Water Calculator
Balance feed, permeate and reject streams.
Use tool →RO Production vs Demand Planner
Compare corrected production, demand peaks and usable storage.
Use tool →Media Filter Loading Rate Calculator
Calculate service and backwash loading from actual filter area.
Use tool →Chlorine Dose & Solution Volume Calculator
Convert a user-supplied target dose into active mass and solution volume.
Use tool →Disinfection Contact Time Calculator
Calculate nominal time, effective time and CT from measured residual.
Use tool →Water Treatment Train Selector
Build test-led candidate stages without declaring potable safety.
Use tool →Greywater Supply Calculator
Estimate measured shower, bath, laundry and bathroom-basin water available for reuse.
Use tool →Greywater Irrigation Demand Planner
Compare reusable supply with ET, rainfall, plant and efficiency-based landscape demand.
Use tool →Laundry-to-Landscape Zone Planner
Distribute one laundry event across a practical whole-outlet range.
Use tool →Greywater Surge & Basin Checker
Screen delivered event volume against entered void capacity and infiltration.
Use tool →Greywater Reuse Savings Calculator
Estimate annual water and sewer savings and simple payback from local tariffs.
Use tool →Understand the decisions
How to Size a Water Pump
Build a duty point from flow and total dynamic head.
Read guide →How to Read a Pump Curve
Find the duty point and interpret the operating region.
Read guide →How to Diagnose Low Water Pressure
Separate pressure, flow and local restrictions.
Read guide →Well, Borehole & Tube Well Terminology
Use globally variable source-water terms carefully.
Read guide →Complete Well Water System Planning
Connect yield, pump duty, controls, pressure and storage.
Read guide →Pressure Tank Drawdown & Short Cycling
Understand precharge, switch settings, run time and symptoms.
Read guide →Water Storage for Demand, Outages & Refill
Separate daily demand, peak use, refill and emergency reserve.
Read guide →Rainwater Harvesting System Planning
Plan from horizontal roof area through treatment and end use.
Read guide →How to Measure Irrigation Flow and Dynamic Pressure
Measure supply without confusing static pressure and flow.
Read guide →How to Split Sprinklers into Practical Zones
Build compatible hydraulic and landscape zones.
Read guide →How to Troubleshoot a Low-Pressure Sprinkler Zone
Use a safe observation sequence before changing equipment.
Read guide →How to Read a Water Test Report
Interpret sample context, units, qualifiers and follow-up needs.
Read guide →Sediment Filter vs Carbon Filter vs Softener vs RO vs UV
Compare what each technology can and cannot do.
Read guide →How to Build a Water Treatment Train Without Over-Treating
Sequence treatment from evidence, flow and maintenance constraints.
Read guide →How to Plan a Home Greywater Reuse System
Move from allowed sources and measured volume to demand, distribution, diversion and maintenance.
Read guide →How to Troubleshoot Greywater Irrigation
Investigate runoff, ponding, odor, weak outlets and plant stress without unsafe exposure.
Read guide →Check the underlying data
Water Flow, Pressure & Volume Conversions
One practical conversion table.
Open reference →Water Pressure & Head Conversion
Relate pressure to metres and feet of water.
Open reference →Hazen–Williams C Values
Typical preliminary ranges and limitations.
Open reference →Water Pipe Internal Diameters
Nominal size is not internal diameter.
Open reference →Pump Formulas & Hydraulic Terms
A compact notation and formulas reference.
Open reference →Water Demand Planning Factors
Build explicit average, peak, outage and refill scenarios.
Open reference →Water Quality Parameter Glossary
Understand common laboratory and field parameters without treating one value as a verdict.
Open reference →Water Treatment Technology Comparison Matrix
Compare purpose, pressure, waste, power and maintenance at a glance.
Open reference →Greywater Source & Use Screening Reference
Screen source characteristics, end uses and questions that require local approval.
Open reference →Connections beyond this cluster
Wells, Storage & Rainwater defines source yield and storage, Irrigation & Sprinkler Systems defines end-use zones, Water Treatment & Water Quality adds testing and treatment constraints, and Greywater Reuse Planning connects non-potable wastewater supply to distribution and receiving capacity.