Water Resources Engineering Toolbox

Explore our collection of free, open-access engineering tools and calculators. Designed to assist water resource professionals in quickly processing complex calculations and extracting scientific data.

Public API Rate Limits

These utilities are open to the public but are strictly rate-limited and protected by automated bot detection to ensure stability for all users. If you require programmatic bulk access to any of these underlying engines or need custom calculator builds, please contact jason@lillywhitewater.com.

Climate Time Series Explorer

A unified utility to easily find, download, and analyze historical daily climate time-series data from NOAA GHCN-D. It provides geographic search, data filtering, and advanced statistical analysis for both precipitation and temperature—including extremes, distributions, and long-term Mann-Kendall climatic trends.

Launch Tool

Riprap Channel Design

Calculate stone sizing for channel armoring based on Isbash methodology and velocity profiles.

Launch Tool

WGEN Parameter Generator

Calculates parameters used for the WGEN stochiastic weather model based on historical time series data.

Peak Flow Return Period Calculator

Evaluates annual peak flows and computes return periods for river flow data.