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= Introduction =
In thisFMA challengeChallenge 1, a fully two-dimensional model with a nested one dimensional model has been developed to explore in and over-bank floodplain conditions. The model includes several hydraulic structures/bridges within the main stream system which impact flood elevations. Flooding of the urbanised over-bank floodplain is experinced. For interest, the requirements of the FMA challenge are provided [httphttps://www.tuflow.com/Download/TUFLOW/Demo_Models/2012_FMA_Challenge/All/FMA%20Challenge%201%20Documention.TUFLOW.pdf here]<br><br>▼
The FMA Challenge Wikis provide example TUFLOW models submitted by BMT WBM for the Floodplain Management Association 2-Dimensional Model Challenges, 2012.
This Wiki assumes an intermediate to advanced user level so if you're just starting out or haven't already completed the tutorial models, please see this <u>[[Tutorial_Model | tutorial model]]</u> page. <br>
 
A fullyThe functional exampleFMA modelChallenge 1 (1D-2D linked) has been developed allowing you to review the model setup, run the model and review results developingimproving your skills in:▼
▲In this challenge, a fully two-dimensional model with a nested one dimensional model has been developed to explore in and over-bank floodplain conditions. The model includes several hydraulic structures/bridges within the main stream system which impact flood elevations. Flooding of the urbanised over-bank floodplain is experinced. For interest, the requirements of the FMA challenge are provided [http://www.tuflow.com/Download/TUFLOW/Demo_Models/2012_FMA_Challenge/All/FMA%20Challenge%201%20Documention.TUFLOW.pdf here]<br>
 
▲A fully functional example model has been developed allowing you to review the model setup, run the model and review results developing your skills in:
*Nested 1D/2D models;
*Understanding urban riverine conditions and over-bank floodplains;
*Using the powerful functionality of scenarios and variables to determine a suitable cell size, timestep and log output scenarios;
*Understanding the impact of data quality on DEM development;
*Understanding the influence of structures on open channel hydraulics;
*Using scenariosbc andlayers variableswith toHX, determine a suitable cell sizeXP, timestepCD and log outputCN scenariostypes; and
*UsingUnderstanding bcthe layersimpact withof HX,data XP,quality CDon andDEM CN typesdevelopment.<br><br>
 
Data for this model is provided viain ZIPa compressedvariety fileof availabledifferent [http://wwwGIS compatible formats.tuflow.com/Tuflow%20Tutorial%20Models.aspx Download onthe dataset that matches the TUFLOWGIS Downloadssoftware Page].you are using:
*[https://www.tuflow.com/Download/TUFLOW/Demo_Models/FMA_Challenge_Model_1_QGIS.zip QGIS Data Download]
*[https://www.tuflow.com/Download/TUFLOW/Demo_Models/FMA_Challenge_Model_1_MapInfo.zip MapInfo Data Download]
*[https://www.tuflow.com/Download/TUFLOW/Demo_Models/FMA_Challenge_Model_1_ArcGIS.zip ArcGIS Data Download]
 
=Relevant Tutorials=
Although all Tutorials are of relevance for the FMA Challanges, For FMA Challange 1, it may be useful to revisit the following:<br>
*<font color="blue"><tt>1D-2D Linking - </ttu></font>- [[Tutorial Module02Tutorial_M03|Tutorial Module 23]] </u>
*Running Scenarios - <u>[[Tutorial_M08|Tutorial Module 8]]</u>
*<font color="blue"><tt>Running Events and Scenarios</tt></font>- http://www.tuflow.com/forum/index.php?showtopic=1149&hl=scenario<br>
*Running Events - <u>[[Tutorial_M09|Tutorial Module 09]]</u>
 
=Model Setup=
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==Computational Domain Assembly==
TUFLOW directly reads GIS data layers to construct models. The layers used/created for Challenge 1 are:
<ol>
<li>A DEM TIN created from the provided terrain data (2ft contours) and exported to ESRI ASCII format as a 2ft DEM grid. When TUFLOW reads this DEM it interpolates the elevations onto the 2D computation grid.</li>
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