Hydrology Calculators
Enhance your hydrology projects with our free online hydrology calculators. Calculate travel time, hydrographs, underdrain requirements, runoff volumes, friction losses, and more to optimize water resource management.
Time of Concentration & Travel Time
Hydrograph & Discharge Calculators
Underdrain Calculators
Recovery Calculators
Storage & Runoff Calculators
- Stage Storage Depth Calculator
- Pond Storage Volume Calculator
- Stormwater Runoff Volume Calculator
- Detention Storage Volume Calculator
- Rational Formula Runoff Depth Calculator
- Rainfall Intensity Calculator
- Weighted Curve Number Calculator for a Basin
- Composite Curve Number Calculator with Unconnected Impervious Area
- Composite Curve Number Calculator
Friction Loss & Pipe Calculators
- Partial Flow Pipe Expansion Friction Loss Calculator
- Partial Flow Pipe Contraction Friction Loss Calculator
- Thru Manhole Friction Loss Calculator
- Pipe Expansion Friction Loss Calculator
- Pipe Contraction Friction Loss Calculator
- Friction Loss in Bend Calculator
- Required Pipe Diameter Calculator
- Pipe Load from Distributed Load Calculator
- Pipe Load Calculator
- Culvert Outlet Velocity Calculator