Search found 60 matches

by rcoville
Tue Mar 02, 2021 12:30 pm
Forum: Hydro
Topic: Bulk Landcover Area
Replies: 1
Views: 411

Re: Bulk Landcover Area

Hi Twan, Sorry for the trouble you're running into. To help us troubleshoot, would you please clarify the kind of error you get and exactly when it appears? For example, two errors you might get on step 2 that indicate different types of problems: A. When you try to press next, a small red triangle ...
by rcoville
Fri Nov 13, 2020 2:21 pm
Forum: Hydro
Topic: Weather data inputs
Replies: 4
Views: 9711

Re: Weather data inputs

Matt, I've checked in with the weather preprocessor developer to get a clearer answer to your question. In the interim, I'll share that I was able to manually enter a year outside of the drop-down menu range and successfully preprocess weather and run it in Hydro+. Specifically, I clicked on the yea...
by rcoville
Wed Nov 11, 2020 4:04 pm
Forum: Hydro
Topic: Weather data inputs
Replies: 4
Views: 9711

Re: Weather data inputs

Thanks for sharing that clarification and feedback Matt. Glad you were able to navigate compiling that program, despite a build error you needed to troubleshoot. To make this easier for other users, the weather preprocessor package now includes a compiled EXE, and the instructions above have been up...
by rcoville
Thu Sep 24, 2020 2:41 pm
Forum: i-Tree v6.x
Topic: Hydro v6-beta Water Quality units labeled as kilograms while output is in grams
Replies: 0
Views: 2484

Hydro v6-beta Water Quality units labeled as kilograms while output is in grams

The Hydro v6 (beta) Graphical User Interface (GUI) has a bug in its pollutant loading output. The model's pollutant loading outputs are erroneously presented in grams while being labeled as kilograms, making them 1000x too high. The % change in pollutant loading is correct, but absolute values are 3...
by rcoville
Mon Apr 27, 2020 9:15 am
Forum: Hydro
Topic: Does i-Tree use the Curve Number approach?
Replies: 0
Views: 2931

Does i-Tree use the Curve Number approach?

i-Tree does not use the Curve Number approach. Part of i-Tree Hydro's origin is as a process-based hydrology model alternative to Curve Number-based runoff models. If you'd like to learn more about i-Tree's hydrology engine, with specific interest in how it differs from Curve Number and handles subs...
by rcoville
Tue Apr 21, 2020 5:47 pm
Forum: i-Tree v6.x
Topic: Hydro v6.3-beta Soil Macropore parameter misnamed "Percentage" but should be "Fraction", and has outdated default value
Replies: 0
Views: 3371

Hydro v6.3-beta Soil Macropore parameter misnamed "Percentage" but should be "Fraction", and has outdated default value

The Hydro v6.3.4 Graphical User Interface (GUI), Step 3 Hydrological Parameters, includes "Soil Macropore Percentage" as a parameter. That parameter has a range of 0.0000001–0.2 and a default of 0.000001. Here are two known issues with this parameter: Soil Macropore parameter units are actually a de...
by rcoville
Tue Apr 21, 2020 5:04 pm
Forum: Hydro
Topic: Errors when processing weather or stream data - what to do?
Replies: 2
Views: 6154

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

Hello, The images on this thread are not visible, can you please re-attach them? Hi lalonde340, I've updated the original post's image links and have included the error examples as plain text. Please let us know if you still cannot see the error images or have any other feedback. Thanks and best wi...
by rcoville
Wed Mar 11, 2020 3:40 pm
Forum: Hydro
Topic: [Advanced] Differences in sub-routines for Infiltration Rate Decay
Replies: 0
Views: 2916

[Advanced] Differences in sub-routines for Infiltration Rate Decay

In i-Tree Hydro there are two different routines available for estimating infiltration rate decay. The two different routines are listed below, along with the condition for which the i-Tree Hydro GUI would use each respective routine: Power Decay: used when a user-provided DEM is input for project t...
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: 7049

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: 5602

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: 6864

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: 26499

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: 8544

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: 8518

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: 2
Views: 6154

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...