Inverbrackie Creek using the Runoff-Routing Model - Split-Sample Validation - Engineering Assignment Help

Assignment Task :

Objective 

This work will involve the development and calibration of the RORB model for the Inverbrackie Creek  catchment, as well as its application to obtain the required design flows. In addition, the calibrated  RORB model is to be used to assess the impact of the stormwater runoff from the proposed mine site on  the 1:100 year design hydrograph at: (i) the point where stormwater from the mine site is discharged into  Inverbrackie Creek, and (ii) the gauging station. 

The final task in this phase is to compare and contrast the multiple estimates of design flows at the  Inverbrackie Creek gauging station, with the aim of recommending final values for practical work. 

Tasks 

1. RORB model development (calibration and validation):  

(i) Division of catchment into appropriate sub-areas and identification of nodes 

(ii) Development of RORB catchment file for calibration (fit) runs 

(iii) Selection of storm events (rainfall and corresponding runoff data) for calibration and validation (iv) Determination of the “best” RORB model parameters (i.e. model calibration) 

(v) Testing (validation) of the calibrated RORB model 

(vi) [Masters only] – undertake split-sample validation (where you switch the calibration and validation periods and re-do the analysis) and comment on the results 

2. Determination of 1:10 and 1:100 year design flows at gauging station, including the impact of the mine site  (25% of the marks)  

(i) Appropriate alteration of RORB catchment file 

(ii) Input of appropriate IFD data for Inverbrackie Creek catchment 

(iii) RORB design runs for 10 and 100 year return periods. At a minimum, this should be done for a range  of design durations and temporal patterns as specified in ARR, but potentially could include Monte  Carlo Analysis on a wider range of inputs for the design runs  

(iv) Choice of 1:10 and 1:100 year design hydrographs and peak flows 

(v) Determination of impact of mine site on 1:100 year design hydrograph at discharge point and gauging  station. This will require: 

 (a) Appropriate alteration of RORB catchment file 

 (b) RORB design runs for 100 year return period for a range of design durations and temporal patterns

  (c) Comparison to results without the mine site

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