Evaluation of Natural Channel Design Versus Traditional Stormwater Infrastructure in Texas Page: II
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4 .3 .1 . U rb a n v s. R u ral ....................................................................................................................4 3
4.3.2. Flowchart (Applicability Tree).............................................................................................46
5. Objective 2: How does NCD and traditional stormwater practices compare regarding
ecological and water quality benefits? ....................................................................................................48
5.1. TMDLs in Texas Metropolitan Areas ...........................................................................................49
5.2. Processes or Mechanisms of Removal........................................................................................50
5.3. Pollutant Removal Performance.................................................................................................50
5 .3 .1 . N u trie n ts ............................................................................................................................. 5 0
5.3.2. Total Suspended Solids (TSS) ..............................................................................................52
5 .3 .3 . B a cte ria ...............................................................................................................................5 3
5.4. Ecological Considerations ...........................................................................................................54
5.4.1. Riffle/Run/Pool/Glide and Fish Habitat ..............................................................................54
5 .4 .2 . M acro inve rte b rates ............................................................................................................55
5.4.3. Riparian W ildlife Habitat and Corridor .......................................................................... 56
6. Objective 3: What is the difference in cost between NCD and more traditional stormwater
conveyance projects? ................................................................................................................................57
6.1. Cost Comparison of Channel Management Options ..................................................................57 U
6.1.1. Right-of-W ay/Easement Acquisition............................................................................... 59
6.1.2. Design and Total Construction Costs..................................................................................60
6.2. Direct Comparison of Costs.........................................................................................................62
6.2.1. NCD vs Traditional Costs for Stream Order 4 or Greater................................................ 65
6.2.2. NCD Versus Traditional Cost for Stream Order 3 or Less....................................................66
6.2.3. NCD versus Traditional Methods Comparative Conclusions .......................................... 66
6.3. Economic Benefits of NCD Projects ........................................................................................ 66
6.3.1. Economic Framework for Stream Restoration................................................................ 66
6.3.2. Methods of Quantification of Economic Benefits of Stream Restoration Projects........ 67
6.3.3. Case Studies of the Evaluation of the Economic Benefits of NCD .................................. 69
7. Potential Funding M echanisms for NCD........................................................................................74
8. Conclusions and Recommendations.............................................................................................75
8.1. Applicability for Use of NCD Techniques in Texas ......................................................................75
8.2. Ecological and Water Quality Benefits of NCD Techniques over Traditional Stormwater
P ra ctic e s .................................................................................................................................................. 7 6
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KBR (Firm). Evaluation of Natural Channel Design Versus Traditional Stormwater Infrastructure in Texas, report, April 1, 2013; Texas. (https://texashistory.unt.edu/ark:/67531/metapth653557/m1/4/: accessed June 9, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.