i-Tree Eco estimates runoff using precipitation derived from the weather year & location set by users in Project Configuration, along with a simplified i-Tree Hydro simulation. In this simplification, other than tree cover, land cover is set as either pervious or impervious based on averages for...

There are specific processes we need to consider for hydrology in locations with most precipitation coming in the winter, frozen. In the version 2 update of i-Tree Hydro, the underlying model was improved to include cold climate hydrology routines in the form of 4 processes: snow interception; snow ...

Hi picknb, Thanks for your interest in using i-Tree Tools. The key to the results you're seeing is that interception in i-Tree Streets is different, and more inclusive, than avoided runoff in i-Tree Eco and the Hydro model. The following paper details the differences in methodologies between the rai...

Stream flow data is necessary to auto-calibrate a project in i-Tree Hydro. This is only possible in watershed-area projects; stream gauge data used in i-Tree Hydro represents discharge from a given watershed a/k/a drainage basin. Auto-calibration is optional: i-Tree Hydro can run using Suggested Def...

Weather information is required for i-Tree Hydro simulations. Of the 3 options i-Tree Hydro provides for weather input (users can pick from a map; use raw data; or use processed data), the most common and practical route is to pick from a map. If the map doesn't have data for the area or time period...

A PDF version of this flyer is available for download here: Please feel free to distribute this to your network of professionals who may be interested. Thanks!

Observed and predicted streamflow are only applicable for watershed area projects, where stream gauge data is a possible project input. Observed flow is based on the measured stream gauge data. Predicted flow is simulated by model processes. The difference between observed and predicted flows become...

What outputs reflect water in sewer systems and Waste Water Treatment Plants (WWTPs)? In the outputs of i-Tree Hydro, impervious flow is a component of total flow which represents water flowing on impervious surfaces (such as roads and sidewalks) and in subsurface pipe networks (such as sewer syste...

This post will include answers to frequently asked questions about hydrological parameters in step 3 (a/k/a parametrization). Additional information about this subject can be found in: The i-Tree Hydro User Manual: http://www.itreetools.org/resources/manuals/i-Tree%20Hydro%20Users%20Manual.pdf The i...

What land cover information is needed in i-Tree Hydro? Tree Cover (%) Pervious Cover Beneath Tree Canopy (%; representing land cover under tree cover) Impervious Cover Beneath Tree Canopy (%; representing land cover under tree cover) Evergreen Tree (%; a percent of a percent, representing how much ...

Project elevation information can be input as either: a Topographic Index (TI) file, developed for use in hydrological models; or a Digital Elevation Model (DEM) file, commonly used in GIS software for a variety of purposes. TI files have been pre-processed and loaded into i-Tree Hydro to make it ea...

General questions about calibration in i-Tree Hydro are hopefully answered by the following. More specific questions about troubleshooting auto-calibration can be addressed case by case. Additional information about this subject can be found in: The i-Tree Hydro User Manual: http://www.itreetools.or...

i-Tree Hydro is flexible with regard to spatial and temporal scale of inputs. A project can be about a large or small area of land or time. In terms of project time periods: i-Tree Hydro works with hourly inputs and outputs. Thus projects are in theory limited to one hour as a minimum project time p...

i-Tree Hydro can simulate how tree and other vegetation cover effects runoff for watershed areas, such as all land upstream from and feeding into a river mouth, and non-watershed areas, such as all land within the city boundary. Synonyms of watershed area that may be more familiar: drainage basin; c...

For now, we are limited in how we can model Low Impact Development (LID) and Green Infrastructure (GI) strategies in i-Tree Hydro v5.0. We can do so with basic land cover conversions or fairly technical changes to hydrological parameters. In addition to the challenges inherent in modeling green infr...