Gage Weights and Precipitation Methods in Hydrologic Modeling
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Gregory Karlovits, P.E., PH, CFM
Hydrologic Engineering Center
U.S. Army Corps of Engineers
Gage Weights Precipitation Method
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Pros
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Flexible
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Accounts for space and time variation
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Can be calibrated
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Cons
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Still dependent on gage data
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Up to you to determine weights
Setting Up A Gage Weights Model
Include Subbasins
Use Gages
Weights
Estimating Depth Weights
Estimating Time Weights
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Best practice: use a weight of 1 for the “best” gage, considering:
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Granularity of data – finer is better
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Location of gage – near the center of subbasin is better
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Use 0 for the rest
Total Storm Gages
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Total precipitation known
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Time distribution unknown
Optional Settings in Met Model Editor
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Use Indexing
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Adjust for climatology
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Total Override
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Override total depth for a gage
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Gregory Karlovits, P.E., PH, CFM
Hydrologic Engineering Center
U.S. Army Corps of Engineers
Hello, HMS modelers. I’m Greg Karlovits, senior hydraulic engineer at the U.S. Army Corps of Engineers Hydrologic Engineering Center. In this video I will provide a brief introduction to the Gage Weights precipitation method in the HEC-HMS meteorological model.
Exploring the concept of gage weights and precipitation methods in hydrologic modeling using the HEC-HMS software. Dive into the pros and cons of flexible gage weighting, calibration processes, and best practices for estimating time and depth weights. Discover how to set up a gage weights model, include subbasins, and utilize gages effectively in your hydrologic engineering projects.
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Presentation Transcript
HEC HEC- -HMS HMS Meteorologic Models: Meteorologic Models: Gage Weights Gage Weights Precipitation Method Precipitation Method Gregory Karlovits, P.E., PH, CFM Hydrologic Engineering Center U.S. Army Corps of Engineers
Gage Weights Precipitation Method Pros Flexible Accounts for space and time variation Can be calibrated Cons Still dependent on gage data Up to you to determine weights
Estimating Time Weights Best practice: use a weight of 1 for the best gage, considering: Granularity of data finer is better Location of gage near the center of subbasin is better Use 0 for the rest
Total Storm Gages Total precipitation known Time distribution unknown
Optional Settings in Met Model Editor Use Indexing Adjust for climatology Total Override Override total depth for a gage
HEC HEC- -HMS HMS Meteorologic Models: Meteorologic Models: Gage Weights Gage Weights Precipitation Method Precipitation Method Gregory Karlovits, P.E., PH, CFM Hydrologic Engineering Center U.S. Army Corps of Engineers
