Search found 52 matches

by rcoville
Thu Apr 11, 2019 9:18 am
Forum: Hydro
Topic: Why is the ratio of pervious runoff to baseflow so different for my project in Hydro v5 vs. v6?
Replies: 0
Views: 1187

Why is the ratio of pervious runoff to baseflow so different for my project in Hydro v5 vs. v6?

We've found various cases where a project run in v5 vs. v6 varies significantly in how each allocates baseflow and pervious flow. This can also result in slightly different total flow estimates. In all cases so far, we've found that the issue is that the project inputs are not identical in these com...
by rcoville
Tue Mar 26, 2019 10:31 am
Forum: Hydro
Topic: Instantanious vs Continuous variables, or Why are some advanced output variables very different orders of magnitude?
Replies: 0
Views: 176

Instantanious vs Continuous variables, or Why are some advanced output variables very different orders of magnitude?

Note that some of these Advanced Output variables are instantaneous whereas some are continuous . For example, interception by vegetation is an instantaneous variable, reset at each timestep and only representing the water engaged in that process at each individual timestep; storage on vegetation is...
by rcoville
Mon Mar 04, 2019 3:44 pm
Forum: Hydro
Topic: Why did total flow go down when impervious cover went up? (Troubleshooting unexpected results)
Replies: 0
Views: 199

Why did total flow go down when impervious cover went up? (Troubleshooting unexpected results)

There's a few things to look for when counter-intuitive results come up. This FAQ shares a response to a user who asked why total flow was decreasing in the scenario that increased impervious cover, along with other information and explanation that has helped clarify unexpected results. --- How has ...
by rcoville
Thu Oct 11, 2018 1:07 pm
Forum: Hydro
Topic: What is the differece between pervious flow, impervious flow and baseflow?
Replies: 0
Views: 21003

What is the differece between pervious flow, impervious flow and baseflow?

The model estimates total streamflow using three flow components: pervious area runoff, impervious area runoff, and baseflow. Pervious runoff is surface flow generated by infiltration or saturation excess flows. Infiltration excess flow is generated when the amount of water attempting to infiltrate ...
by rcoville
Tue May 29, 2018 1:12 pm
Forum: i-Tree v6.x
Topic: Hydro v6.1.1-beta Preprocessed weather files not accepted due to 1 missing record
Replies: 0
Views: 2968

Hydro v6.1.1-beta Preprocessed weather files not accepted due to 1 missing record

In Step 1) Project Area Information, users can enter preprocessed weather data files, but Hydro v6.1.1-beta is rejecting normally-acceptable preprocessed weather files because of a minor formatting issue. The error presented to users is that the weather files they input do not match the project peri...
by rcoville
Tue May 29, 2018 1:01 pm
Forum: i-Tree v6.x
Topic: Hydro v6.1.1-beta Precipitation values differ between preloaded weather & equivalent raw NCDC data
Replies: 0
Views: 3025

Hydro v6.1.1-beta Precipitation values differ between preloaded weather & equivalent raw NCDC data

We notice that in a few test cases, in Hydro v6 preloaded weather data differs slightly from equivalent raw weather data users obtain on their own. This bug only affects the weather data input and the rest of the estimates continue working fine with either source of weather data. Given i-Tree Hydro ...
by rcoville
Thu Mar 01, 2018 9:49 am
Forum: Hydro
Topic: Errors when processing weather or stream data - what to do?
Replies: 0
Views: 3284

Errors when processing weather or stream data - what to do?

If you are using preloaded data, please write to us as info [at] itreetools.org and we'll help troubleshoot the dataset. If you're using your own datasets obtained or modified outside of i-Tree Hydro, we cannot troubleshoot your specific files for you, but the following information may assist you in...
by rcoville
Thu Feb 08, 2018 12:05 pm
Forum: Hydro
Topic: Customizing timeseries inputs (e.g. weather, observed flow) in Hydro v6
Replies: 0
Views: 3597

Customizing timeseries inputs (e.g. weather, observed flow) in Hydro v6

i-Tree Hydro V6 processes timeseries data - weather, evaporation, and observed streamflow - into a comma delimited format. This is intended to make it easier for users to customize their timeseries inputs. Comma delimited data can be copy and pasted into spreadsheet software such as Microsoft Excel,...
by rcoville
Wed Jan 31, 2018 3:45 pm
Forum: General
Topic: How do I create an i-Tree installation CD?
Replies: 0
Views: 30145

How do I create an i-Tree installation CD?

An i-Tree installation CD can be created using an ISO Image file available at the i-Tree Desktop Applications Download page: https://www.itreetools.org/tools.php Instructions on how to burn an ISO Image file onto a CD/DVD-ROM are available at: http://knowledge.seagate.com/articles/en_US/FAQ/201431en...
by rcoville
Thu Nov 16, 2017 8:32 am
Forum: i-Tree v6.x
Topic: Hydro stream gage map "index was out of range" bug
Replies: 1
Views: 2848

Re: Hydro stream gage map "index was out of range" bug

This issue has been resolved in i-Tree Suite v6.1.20. If you have the software already downloaded on your computer, open one of the apps and update through that. For example, open i-Tree Hydro then click on Help drop-down in the top menu bar and select "Check for Updates".
by rcoville
Thu Nov 16, 2017 8:30 am
Forum: i-Tree v6.x
Topic: Known Issue: Eco v6 crashing & Streets reports failing
Replies: 1
Views: 3923

Re: Known Issue: Eco v6 crashing & Streets reports failing

This issue has been resolved in i-Tree Suite v6.1.20. If you have the software already downloaded on your computer, open one of the apps and update through that. For example, open i-Tree Eco then click on update software in the top menu bar.
by rcoville
Mon Oct 30, 2017 1:20 pm
Forum: i-Tree v6.x
Topic: Hydro stream gage map "index was out of range" bug
Replies: 1
Views: 2848

Hydro stream gage map "index was out of range" bug

Preloaded streamflow data selected from a map is not downloading correctly correctly. If starting a project from scratch and downloading streamflow data from the map, you'll get an "Index was out of range" error. If other streamflow data had been provided in the project, the program will use that in...
by rcoville
Thu Jul 27, 2017 11:33 am
Forum: i-Tree v6.x
Topic: Hydro v5.1 Default & Range of Annual Average Flow parameter
Replies: 0
Views: 4138

Hydro v5.1 Default & Range of Annual Average Flow parameter

There are multiple Hydro v5 issues revolving around the parameter q0 (listed in the GUI as 'Annual Average Flow of Project Area') having its default value and range calculated incorrectly by the software. We're converting from Annual Average Flow (m^3/s) in the GUI to specific discharge (m/hr) and s...
by rcoville
Thu May 25, 2017 10:11 am
Forum: Hydro
Topic: Valuing Avoided Runoff in i-Tree
Replies: 0
Views: 4979

Valuing Avoided Runoff in i-Tree

Question: How can reduced stormwater flow and pollution be quantified into money saved by a municipality in the northeast USA? Answer: Reduced stormwater flow and pollution is valued in i-Tree as 'net avoided runoff', meaning the amount of surface runoff (and associated pollutants) that no longer n...
by rcoville
Tue Apr 25, 2017 8:01 am
Forum: Hydro
Topic: Root zone depth: what is it & why is the default so low?
Replies: 0
Views: 4086

Root zone depth: what is it & why is the default so low?

Root Zone depth, also known as the Upper Active Soil Zone, represents the root zone 'storage' area, which evapotranspiration draws water from. It reflects an average for all vegetation types, from small grasses to large trees, so we set the default to represent a shallow area close to the surface. T...