Re: Pre-defined watershed and stream dataset in ArcSWAT?

[Janne Helin]

Hi,

I had plenty of problems with manual delineation, but in the end I managed. I needed to manipulate streams quite a lot. I had used TauDEM to calculate stream network, but the finer stream order was too big for SWAT to handle. Bigger stream orders did not create streams for the smallest of my manually defined subbasins, so I had to combine different stream order data from different subwatersheds and make my own "river".

-Janne Helin
Natural Resources Institute Finland (Luke)

On Friday, March 20, 2015 at 1:32:05 AM UTC+2, Salam Abbas wrote:

Hi everyone,

I want to use my own subbasin and my own stream with ArcSWAT on the Watershed Delineation step because my area is quite flat. There is Pre-defined section where we can add watershed dataset and stream dataset. I understood all the attribute table for user watershed in the folder named ExInputs and I've made my case study and it works correctly. However, I just cannot understand how to prepare stream shapefile and link its attruibutes to watershed file attribute.

Could anyone please help me Any ideas what might have gone wrong?

Additionally, I keep getting the following error message during subbasin parameter calculation (last step of watershed delineation) when using the predefined watershed and stream layers in ArcSWAT 2012. I think I closely followed the example files to prepare the watershed and stream layers. Any ideas what might have gone wrong? Your expertise is highly appreciated.
 
===================
Error Number: 91

Error Message: Object reference not set to an instance of an object

Module name: mSWFlow
Function name: Setparameters
Procedure (error line or description): 6 GRIDCODE=2

====================

I've attached my data.

Many thanks in advance,

Salam

[Xinzhong Du]

Hi, Janne. How many subwatersheds in your project. I have 241 subwatersheds in my project, and it is so difficult and time-consuming to manually delineate the streams for each subwatersheds. How do you combine different stream order data from different subwatersheds and make your own "river"?

在 2015年3月20日星期五 UTC-5上午7:33:38，Janne Helin写道：

[Janne Helin]

Hi,

Well, I only have split the watershed in 19 subbasins. The number of the subbasins is not really making it so difficult, I believe.  You would just have to select the watersheds with size criteria and apply different stream orders based on the that criteria and then join them. I do not do this "manually" in ArcGIS, but using the model builder or occasionally python scripting.   Challenges related to the sub-basin sizes being so different that the streams from the smaller order would not be connected with the bigger order ones.

-Janne

[Madhukar Chavan]

Hello friends,

I am Madhukar Chavan pursuing Ph. D. (Irrigation and Drainage Engineering) from College of Agricultural Engineering and Technology, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani (Maharashtra State) India. My Ph. D. research entitled "Assessment of area and water allocation in canal command area of Purna irrigation project" with following specific objectives:

1. To assess the water availability in reservoir of Purna irrigation project using SWAT.

2. To analyze the existing water allocation strategies and cropping pattern of study area

3. To estimate the irrigation water demand under rotational supply of irrigation water in canal command area of study area and

4. To suggest the optimum cropping pattern based on performance indicators for the study area

Right now I am preparing all soil data layers required for my study area and run the SWAT model successfully for watershed delineation, reservoir addition and get the water availability as surface runoff.Now I need support for the calibration and validation the model.

I am digitized the canal network on toposheets with polyline layer shape files and I want to get these shape files as predefined stream dataset and watershed dataset in SWAT, but I am not getting the proper input files. I had also facing the problem while preparing the predefined stream dataset and watershed dataset with ArcSWAT 2012. My research work planned for canal command areas and I want to prepare predefined stream dataset (Canal as stream) with ordering 1, 2, 3, ......... likewise. So I request to you for helping me the same. Your expertise is highly appreciated.

[adrian munaf]

jane, can you help me to explain the step that you doing in TauDEM one by one? i got an error same like you, and i dont know how to fix it, because i dont understand the step that you explain in this post.

your expertise is highly appreciated