Sitka Technology Group

Stormwater Tools

Quantify BMP Performance and Condition Directly from Integrated Asset Inventory

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Regional stormwater managers across the country are turning to open-source web applications to support their Best Management Practices (BMP) asset management and watershed planning. While assets and associated observations may vary by region, common data management objectives don’t. These objectives – maintaining consistent BMP asset inventories across jurisdictions, rapidly assessing BMP condition, tracking maintenance activities, and determining the performance of BMP assets relative to Total Maximum Daily Load (TMDL) and watershed plan requirements – are the core building blocks of Sitka’s modular Stormwater Tools web application.

Stormwater Tools Webcast Recording

Quantifying Stormwater Capture and Pollutant Load Reduction Directly from a Water Quality Asset Inventory

From the Blog

Sitka and Geosyntec Provide Stormwater Management Solution for Orange County

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Using Data to Curb Urban Water Runoff

Why You Should Care

Build and track your stormwater asset inventories

Assess BMP performance

Delineate catchment areas

Access real-time, map-based dashboards showing program progress

The Sitka-built Lake Tahoe Info Stormwater Tools software is alarmingly intuitive!

Jason Burke | Stormwater Program Coordinator, City of South Lake Tahoe

Stormwater Tools Modules

The Stormwater Tools web application is perfectly suited for multi-jurisdictional collaboration while facilitating inter-operability with other data systems.

StormwaterTools Modules Diagram

The application includes the following modules:

Inventory Module
The Inventory Module is the foundation of the Stormwater Tools platform. It is used to develop and maintain a complete record of structural BMPs, along with their attributes, performance parameters, and related inspection and maintenance logs. System administrators are able to configure and add BMP types, attributes, benchmarks, thresholds, and weighting.

OC Stormwater Tools Inventory Module: Find a BMP

Trash Module
This module is a calculation engine that brings together asset information with other GIS resources to provide real-time quantifications regarding progress. Staff are able to manage jurisdictional land use layers for both priority and alternate land uses, assign attributes to inventoried BMPs, perform On-land Visual Trash Assessments (OVTAs), and view current progress reports all within the system. Progress can be viewed in multiple ways, including area-based (PLU acres), load-based (gallons per year), and OVTAs (acreage of full capture equivalent).

OC Stormwater Tools Trash Module: Area-based Map

Modeling Module
This module quantifies stormwater capture and pollutant load reduction directly from the BMP inventory and development sites. Calculations occur in the modeling engine which maintains a network of catchments, BMPs, and flow paths to recalculate results in real-time when users update the asset inventory. The calculation approach accounts for the cumulative benefit of nested stormwater treatment facilities. It enables web-based modeling by automatically calculating the subset of the watershed affected by an asset inventory update. Module users can easily view calculated reductions for multiple regulated stormwater pollutants including bacteria, metals, TSS, and nutrients, and they can quantify urban runoff captured during dry and wet weather.

OC Stormwater Tools Modeling Module: Delineation Map

Built with You in Mind

One of the key decisions made early in the initial development of the Stormwater Tools platform is the requirement it be configurable by system administrators so they can easily add another BMP type or observation without requiring a new version of the software. This also enables other stormwater organizations to quickly configure Stormwater Tools to the specific requirements of their own jurisdiction or region.

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Upcoming Events

June 22, 2021, 9:00 AM (PDT)
June 23, 2021, 5:00 PM (PDT)

Conference Website

Stormwater Summit 2021: A Virtual Event


Water Environment Federation plans to offer a great experience virtually that will include innovative topics, virtual peer-to-peer networking opportunities, and informative sessions from forward-thinking leaders in the water sector. Participants will be able to create a learning experience that fits their life schedule while earning continuing education credits from a developed online program.

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June 29, 2021, 9:00 AM (PDT)
June 30, 2021, 5:00 PM (PDT)

Conference Website

2021 California Water Boards Water Data Science Symposium


The Surface Water Ambient Monitoring Program (SWAMP), the California Water Quality Monitoring Council, and the San Francisco Estuary Institute (SFEI) are hosting the Sixth Annual California Water Boards Water Data Science Symposium on June 29-30, 2021. This free annual event aims to enhance how water quality monitoring generates and uses meaningful data to inform water quality management decisions.

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From the blog

October 7, 2020

Attend Our Upcoming Stormwater Tools Webcast to Stay in the Know

With our partners Orange County Public Works and Geosyntec Consultants, we are presenting a webinar featuring our open-source, cloud-based platform: OC Stormwater Tools. Creating this tool was a collaborative effort, and we are excited to take a deeper dive into the system and explain in better detail what aspects make Stormwater Tools so invaluable to Orange County and other jurisdictions.

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July 8, 2020

Using Data to Curb Urban Water Runoff

Late last month, the 2020 California Water Boards Water Data Science Symposium was held virtually. We are thrilled to share our contribution to the conference, the Urban Drool Tool. This online tool, developed in conjunction with Orange County Public Works (OCPW), Moulton Niguel Water District (MNWD), and Geosyntec Consultants, allows users to better quantify and visualize the amount of “urban drool,” or unnatural dry weather flow that contributes to water waste runoff in urban neighborhoods.

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