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Maximum Unit Streamflow

Maximum Unit Streamflow

Short Description

Normalization of the maximum streamflow product by basin area at every grid point from a period of 30 minutes prior to model runtime out to 12 hours after model runtime


CREST, SAC-SMA, and Hydrophobic.  The FLASH EF5 framework runs multiple hydrological models using a common input.  For MRMS Version 12, there is a maximum unit streamflow product for each of the 3 models listed here.

Primary Users


Input Sources

MRMS Radar-Only QPE


Spatial:  ~1 km x 1 km

Temporal:  10 minutes

Product Creation

The FLASH EF5 model framework uses MRMS Radar-Only QPE as input into the 3 hydrological models (CREST, SAC-SMA, and Hydrophobic) which then use a subset of these hydrological principles (infiltration, storage, interflow, evapotranspiration, and runoff) to route the precipitation through the basins.  The maximum water flow that occurs at any time in each grid point during the model run from a period of 30 minutes prior to model runtime through 12 hours after model runtime is normalized by the basin area and then assigned to each grid point.

Technical Details

Latest Update: MRMS Version 12

NOTE: In version 12, all FLASH products now use the instantaneous rainfall rates from the Dual-pol radar synthetic QPE product.

Accessible on:

  1. Operational AWIPS
    1. V11.5 -- MRMS menu
    2. V12 -- via LDM, if set-up
  2. MRMS Development site


Gourley, J., Z. Flamig, H. Vergara, P. Kirstetter, R. Clark III, E. Argyle, A. Arthur, S. Martinaitis, G. Terti, J. Erlingis, Y. Hong, and K. Howard, 2016: The Flooded Locations And Simulated Hydrographs (FLASH) project: improving the tools for flash flood monitoring and prediction across the United States. Bull. Amer. Meteor. Soc. doi:10.1175/BAMS-D-15-00247.1, in press.

Jiahu Wang, Yang Hong, Li Li, Jonathan J. Gourley, Sadiq I. Khan, Koray K. Yilmaz, Robert F. Adler, Frederick S. Policelli, Shahid Habib, Daniel Irwn, Ashutosh S. Limaye, Tesfaye Korme & Lawrence Okello (2011) The coupled routing and excess storage (CREST) distributed hydrological model, Hydrological Sciences Journal, 56:1, 84-98, DOI: 10.1080/02626667.2010.543087