Hydrology Tools
Browse all available hydrology tools.
Available tools
- Base Flow Time Point Fraction Tool One observed-flow partition from an explicitly supplied baseflow estimate; no separation filter is applied.
- Baseflow Recession Half Life Factor Tool Calculate baseflow recession half life factor from explicit caller-supplied inputs.
- Catchment Rainfall Runoff Depth Residual Tool Simple precipitation-runoff-ET-storage residual; omitted groundwater exchange appears in the residual.
- Catchment Runoff Depth Equivalent Tool Convert supplied volume per area to a depth with an explicit length-unit factor.
- Catchment Travel Time One Reach Tool Calculate catchment travel time one reach from explicit caller-supplied inputs.
- Circular Conduit Part Full Angle Factor Tool Use the central angle of the wetted circular segment in radians.
- Darcy Series Layer Resistance Term Tool Calculate darcy series layer resistance term from explicit caller-supplied inputs.
- Discharge Sample Time Support Label Qualify an explicit discharge sample time-support label without treating instantaneous and averaged values as interchangeable.
- Evaporation Open Water Area Factor Tool Calculate evaporation open water area factor from explicit caller-supplied inputs.
- Flow Depth Area Factor Tool Compute mean velocity for a supplied rectangular flow cross-section; signed discharge determines direction.
- Gauge Staff Parallax Reference Offset Tool Compare observed and reference staff readings; no parallax-angle model or correction of the independent elevation is inferred.
- Gauge Stage Datum Difference Tool Compare gauge elevations after translating both supplied stage/datum pairs into one reference.
- Gauge Zero Stage Datum Shift Tool Staff stage relative to an explicit gauge-zero elevation, shifted without changing physical water elevation.
- Gauging Vertical Midsection Area Term Tool Use half the span between adjacent bounding verticals as one midsection width.
- Groundwater Hydraulic Gradient Projection Tool Calculate groundwater hydraulic gradient projection from explicit caller-supplied inputs.
- Hydrograph Event Boundary Token Tool Classify one supplied hydrograph time under explicit event endpoint conventions.
- Hydrograph Segment Volume Trapezoid Tool Signed volume under one linearly interpolated flow segment; negative flows remain valid for reversing channels.
- Hydrograph Step Average Instantaneous Reference Tool Compare left/right zero-order hold with linear interpolation for one flow interval.
- Hydrograph Time Centroid Term Tool Return one rectangular hydrograph quadrature volume and its time moment on an explicit origin.
- Hydrology: Water Year Day Index Tool Compute a one-based hydrologic-year day from an explicit annually valid month/day start; excludes February29 annual starts and jurisdiction defaults.
- Infiltration Green Ampt Driving Head Tool Return the ideal Green-Ampt infiltration-capacity multiplier and piston wetting-front depth.
- Infiltration Test Water Head Offset Tool Additive reference offsets on a common vertical axis; no infiltration rate is inferred from head alone.
- Manning Hydraulic Radius Sensitivity Tool Differentiate Manning velocity with respect to hydraulic radius while holding roughness and energy slope fixed.
- Open Channel Wetted Perimeter Panel Term Tool One straight bed panel plus explicitly included vertical sidewalls; interior panel boundaries should not be counted as wetted walls.
- Rainfall Depth Gauge Catch Volume Tool Circular gauge orifice geometry with 1000 mm3 per mL; efficiency reduces expected collected volume.
- Rainfall Double Mass Slope Ratio Tool Calculate rainfall double mass slope ratio from explicit caller-supplied inputs.
- Rainfall Gauge Catch Efficiency Factor Tool Calculate rainfall gauge catch efficiency factor from explicit caller-supplied inputs.
- Rainfall Volume Area Share Tool Calculate rainfall volume area share from explicit caller-supplied inputs.
- Rating Curve Control Shift Tool Apply a signed caller-supplied stage correction before using an external rating curve; no stage-discharge curve or shift is inferred.
- Rating Curve Datum Shift Exponent Tool Calculate rating curve datum shift exponent from explicit caller-supplied inputs.
- Rational Runoff Impervious Area Term Tool Calculate rational runoff impervious area term from explicit caller-supplied inputs.
- Reservoir Evaporation Level Area Term Tool Calculate reservoir evaporation level area term from explicit caller-supplied inputs.
- Reservoir Layer Storage Increment Tool Trapezoidal area-elevation integration assuming area varies linearly across one layer.
- Reservoir Level Area Storage Term Tool Integrate a locally linear area-elevation model from an explicit storage anchor; validity outside the calibrated interval is external.
- Reservoir Storage Difference Depth Tool Convert a storage change to depth on an explicit fixed reference area, not a varying-stage reservoir curve.
- River Discharge Analyzer Summarize a locally supplied river-discharge series without sending it to a server.
- River Flow Percentile and Ensemble Range Compare current river flow with historical percentiles and summarize an ensemble forecast range.
- River Stage Rising Falling Flag Tool Calculate river stage rising falling flag from explicit caller-supplied inputs.
- Runoff Coefficient Landuse Weight Term Tool Calculate runoff coefficient landuse weight term from explicit caller-supplied inputs.
- Runoff Depth Catchment Volume Tool One millimeter over one square kilometer is 1000 m3; connected fraction is an explicit areal assumption.
- Seepage Velocity Porosity Factor Tool Calculate seepage velocity porosity factor from explicit caller-supplied inputs.
- Snowmelt Degree Day One Interval Tool Calculate snowmelt degree day one interval from explicit caller-supplied inputs.
- Soil Storage Deficit One Layer Tool Calculate soil storage deficit one layer from explicit caller-supplied inputs.
- Specific Storage Head Change Volume Tool Calculate specific storage head change volume from explicit caller-supplied inputs.
- Staff Gauge Overlap Reading Gap Tool Calculate staff gauge overlap reading gap from explicit caller-supplied inputs.
- Stream Cross Section Panel Area Tool Trapezoidal wet panel area times caller-supplied signed panel-mean normal velocity.
- Stream Current Meter Frequency Point Tool Evaluate one supplied linear current-meter calibration segment v=a*f+b; no instrument calibration range is inferred.
- Stream Section Trapezoid Wetted Perimeter Tool Calculate stream section trapezoid wetted perimeter from explicit caller-supplied inputs.
- Stream Stage Reference Sign Tool Classify stage against a supplied datum and equality convention without a flood threshold.
- Water Balance Closure Residual Tool Calculate water balance closure residual from explicit caller-supplied inputs.
- Water Balance Inflow Outflow Sign Pair Apply an explicit net-flow sign convention to compatible supplied inflow and outflow volumes without estimating storage terms.
- Weir Submergence Head Ratio Tool Calculate weir submergence head ratio from explicit caller-supplied inputs.
- Weir Tailwater Ratio Flag Tool Compare a common-datum tailwater/head ratio with a supplied limit; no discharge relation is chosen.
- Well Specific Capacity Drawdown Pair Tool Calculate well specific capacity drawdown pair from explicit caller-supplied inputs.
- Well Water Level Casing Reference Tool Signed depth below the measuring point; negative ground depth denotes water above ground rather than being clipped.