Large Area Drainage - Over 6,900 ac
Large Area Drainage - Over 6,900 ac
(OP)
I am analyzing the drainage of a canyon. The total area is 6,909.92 ac. I am wondering what the best way to go about this. I have started HEC-HMS, but the flows are extremly over conservative. I only used 6 basins in my model, but the areas are still so big, that the intensity is a killer. I can break it down further into 27 subasins, but is that too many and a waste of time? Please advise.
Maddog
Maddog





RE: Large Area Drainage - Over 6,900 ac
RE: Large Area Drainage - Over 6,900 ac
Many would say that you should simplify your model to the extent possible. More complex models do not generally generate more accurate results.
Also, why do you think your flows are so "overly conservative?" Have you compared your results with another similar area or with regression equations? Have you done any calibration of your model?
RE: Large Area Drainage - Over 6,900 ac
RE: Large Area Drainage - Over 6,900 ac
RE: Large Area Drainage - Over 6,900 ac
RE: Large Area Drainage - Over 6,900 ac
RE: Large Area Drainage - Over 6,900 ac
Second, how sure are you that your area is 6909.92 acres, plus or minus .01 acres; really?
Third, where is this "canyon" ? In the U.S. ?
Fourth what rainfall data do you have to work with and what is the range of error in that data ?
Fifth, who will review your calculations and what are their criteria and expectations?
Sixth, what range of storm durations, probabilities and antecedent runoff conditions do you want to consider?
These are threshold questions. Do not pass go and do not collect $200 if you haven't answered them.
good luck