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Hydrologic modeling of Waller Creek

Hydrologic modeling of Waller Creek. Prepared by: Mustafa AKCAY. TABLE OF CONTENTS.  BACKGROUND  WORKING WITH HEC-Prepro  RUNNING HMS  CALIBRATION OF HMS PARAMETERS  RESULTS  CONCLUTION. BACKGROUND  HYDROLOGIC SYSTEM MODEL.

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Hydrologic modeling of Waller Creek

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  1. Hydrologic modeling of Waller Creek Prepared by: Mustafa AKCAY

  2. TABLE OF CONTENTS BACKGROUND  WORKING WITH HEC-Prepro  RUNNING HMS  CALIBRATION OF HMS PARAMETERS  RESULTS  CONCLUTION

  3. BACKGROUND HYDROLOGIC SYSTEM MODEL HSM is an approximation of the actual system in which inputs and outputs are measurable hydrologic variables and system operator is described by a set of equations linking the inputs and outputs. Input Output I(t) Q(t) Q(t)= I(t) Operator,

  4. Hydrologic Model Classification System f(ran.,space,time) Hydrologic Models Physical Models  Abstract Models Input Output HMS (Hydrologic Modeling System) Deterministic  Stochastic Output is not a fixed Input F(infiltration,transform,routing) Output value but instead described as a Precipitation, i Stream flow,Q probability distr.

  5. RUNNING HEC-Prepro • Dem  Digital Elevation • RF3  Stream Network

  6. BURNING IN  FILLING STREAM GRIDSFLOW DIRECTION  FLOW ACCUMULATION • Rising the land surface cells that are of stream to delinate streams from DEM. • Filling the pits that are probably to cause wrong flow directions • Defing threshold or minimum drainage area • Darker the color of individual grid,the more grid cells drain into that cell.

  7. GAGES--OUTLETS--LINKSSUB-WATER DELINEATION VECTORIZATION • Shape file with points representing gages that will be imported into ArcView. • Adding outlets to change the places of gages that are off the river and pointing the joints • Delineation of watershed according to gages,outlets,links • Vectorization for easyness of using and storing data compared with grid base analysis.

  8. RUNNING HMSRUNNING HMS Transfer of Hydrologic Attributes to Schematic  Creating the HMS Components • HMSschematic is conceptual model that captures the connectivity between the different elements of the hydrologic system • Opening a new HMS project and importing the basin file , and then adding a background map .

  9. Location of USGS Stations ,38th street and 23rd street, and their annual peak values for corresponding rainfall.

  10. Stream flow vs Precipitation

  11. Best-lines for runoff-rainfall data

  12.  Application of Rational Method • Assumptions: • Computed peak rate of runoff at the outlet point is a function of the average rainfall rate during the time of concentration. • Time of concentration: Time from most remote part of the drainage area to the out flow point. • Constant rainfall intensity.

  13. Most critical flow between 1959-64Q1(HMS)=173cfs Q1(Measured)=289cfs 40%accuracyQ2(HMS)=295cfs Q2(Measured)=717cfs 143% accuracy

  14. Most Critical Flow Between 1965-1972 Q1(HMS)=366.9cfs Q1(Measured)=589 60% accuracy Q2(HMS)=633cfs Q2(Measured)=857 35% accuracy

  15. Most Critical Flow Between 1973-1979 Q1(HMS)=614cfs Q1(Measured)=521cfs 15% accuracy Q2(HMS)=1059cfs Q2(Measured)=1386cfs 30% accuracy

  16. RESULTS • According to data I obtained, by the definition of stochastic model; • the runoff will fall in 140%, 60%, 30% neighborhood of runoff you obtained from HMS between 1959-64, 1965-72, 1973-1979 respectively. • For runoff from 1997-... ?

  17. CONCLUSION • Using SCS Method for Infiltration may increase the precision of the model. • Lots of uncertainty affecting the output so it is difficult to make modeling with high accuracy • Don’t even think of a modeling of a basin by just one rainfall gage station!

  18. Appreciations • Esteban AZAGRA • Jona F.JONSDOTTIR

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