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ES-9

Copyright © 2022 Theodore G. Cleveland

Purpose:

Construct a design storm hyetograph

Problem Statement

Assume that Somewhere USA is to be located in Harris County.

Part 1 (Check Syllabus/BB for Due Date)

  1. Using the NOAA-PFDS estimate the rainfall depth for a 10-year, 6-hour storm in Harris county.
  2. Using the SCS Tabulation or Texas Empirical Hyetographs, construct from the 10-year, 6-hour storm a design hyetograph at 15 minute intervals.

Part 2 (Check Syllabus/BB for Due Date)

  1. Apply the hyetograph to a 1 sq.mi. watershed in SWMM using program defaults for the drainage area description (except set the length to 5280 ft.), use the CN runoff generation model in SWMM with CN=98. Simulate 24 hours of runoff with reporting every 15 minutes.

Deliverables:

A brief report with your solution, showing the rainfall depth(s), hyetograph (on 15-minute intervals) for Part 1 and the SWMM generated hydrograph for Part 2.

A screen capture of the SWMM output is sufficient for Part 2 Do not submit a SWMM output file

References

  1. NOAA Precipitation-Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/
  2. Intensity Interpolater (for use with PFDS results) for non-tabulated durations. http://54.243.252.9/toolbox/ordinarytools/IntensityInterpolate/IntensityInterpolate.html 2.Williams-Sether, T., Asquith, W.H., Thompson, D.B., Cleveland, T.G., and X. Fang. 2004. Empirical, Dimensionless, Cumulative-Rainfall Hyetographs for Texas. U.S.Geological Survey Scientific Investigations Report 2004-5075, 138p. https://75.3.84.227/documents/about-me/MyWebPapers/project_reports/SIR_2004_5075/sir2004-5075.pdf
  3. Neale, C.M., Tay, C.C., Herrmann, G.R., and Cleveland, T.G. 2015. "TXHYETO.XLS a tool to facilitate use of Texas-Specific Hyetographs for design storm modeling." Proceedings of ASCE World Environmental and Water Resources Congress, ASCE-EWRI, Austin, TX. May 17-21, 2015. pp. 241-254.https://75.3.84.227/documents/about-me/MyWebPapers/conference_papers/2015_ASCE_CAROLINE/
  4. TXHYETO (spreadsheet and training video for using Texas empirical hyetographs)http://54.243.252.9/toolbox/hydrology/EBDLKUP-2015-DISTRIBUTE/
  5. Rossman, L.A., 2010 STORM WATER MANAGEMENT MODEL USER’S MANUAL Version 5.0, Technical Report EPA/600/R-05/040,U.S. Environmental Protection Agency, National Risk Management Research Laboratory Cincinnati, OH 45268. http://54.243.252.9/ce-3372-webroot/3-Readings/epaswmm5_user_manual/P100ERK4.pdf
  6. Rossman, L.A., 2006 STORM WATER MANAGEMENT MODEL QUALITY ASSURANCE REPORT: Dynamic Wave Flow Routing, Technical Report EPA/600/R-06/297,U.S. Environmental Protection Agency, National Risk Management Research Laboratory Cincinnati, OH 45268. http://54.243.252.9/ce-3372-webroot/3-Readings/epaswmm5_qa/SWMM5_QA.pdf
  7. Gironás, J., Roesner, L.A., Davis, J. 2009 STORM WATER MANAGEMENT MODEL APPLICATIONS MANUAL , Technical Report EPA/600/R-09/000,U.S. Environmental Protection Agency, National Risk Management Research Laboratory Cincinnati, OH 45268. http://54.243.252.9/ce-3372-webroot/3-Readings/epaswmm5_user_manual/P100ERK4.pdf

EZ Button Link to ES-9 solution sketch

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