# Presentation: 276677

## Support NWS Flash Flood Warning Program:

- Soil type

- Vegetation type / Forest density

- Land Use

- Fire activity

- Slopes

**Support NWS Flash Flood Warning Program:**

**Development of Flash Flood Potential Index**

- - National Application -

**Notes:**
If we go back to our example basin and look at the FFPI output we can now at least see how the basin might differ in hydrologic response characteristics compared to neighboring basins. Considering FFG and rules of thumb do not vary, this type of information provides us with some greater insight regarding our area of interest. 

## Support NWS Flash Flood Warning Program:

**Development of Flash Flood Potential Index**

- Elevation/Slope

- Forest Density

- Soil Type

## FFPI Method:  Using Geographic Information System (GIS)

- Resample and Geo-register Data
- 	Consistent resolution
- 	Same projection/datum

- Overlapping grid cells representing same location on the surface of the Earth

- Gather digital data for different layers
- Soil type
- Forest density/cover
- Slope
- Land use/urbanization

**Support NWS Flash Flood Warning Program:**

**Development of Flash Flood Potential Index**

## Support NWS Flash Flood Warning Program:

**Development of Flash Flood Potential Index**

- GIS Functionality Requirements:

- Manipulate Raster/Gridded Data

- Geo-Registering abilities

- Reclassifying grid cells

## Support NWS Flash Flood Warning Program:

**Support NWS Flash Flood Warning Program:**

**Development of Flash Flood Potential Index**

- GIS Functionality Requirements: ArcView / ArcGIS to handle output

## Support NWS Flash Flood Warning Program:

**Issue Gridded Flash Flood Guidance**

- - Local Application – National Requirement -

## Gridded FFG

**Support NWS Flash Flood Warning Program:**

**Issue Gridded Flash Flood Guidance**

- GIS Functionality Requirements:

## Support RFC Hydrologic Modeling Efforts:

**Calibration Assistance Program**

- - National Application -  => Requires GIS Application ArcView

**Derive elevation profile**

**Sub-divide based on elevation**

**Derive precip characteristics**

**Determine by Basin / El. Zone:**

**Precipitation**

**Evaporation**

**Soil based model parameters**

**Vegetation**

- CAP (GIS) Output:

## Support RFC Hydrologic Modeling Efforts:

**Support RFC Hydrologic Modeling Efforts:**

**Calibration Assistance Program (MAPX)**

- GIS Issue:

- AV/CAP: Unix Platform

- ArcGIS: Windows

- GRASS?

- MAPX pulls info directly from OFS files

## Support RFC Hydrologic Modeling Efforts:

**Support NWS Flash Flood Warning Program:**

**Accounting for Wildfires**

- - Local Applications -

## Support RFC Hydrologic Modeling Efforts:

**Accounting for Wildfires**

- NWSRFS Calibrated Basins Affected By Fire

- Modify Calibration Parameters

## Overlapping Fires near Tucson, AZ 2002-2003

**Aspen Fire June 2003 84,750 acres**

**Bullock Fire Summer 2002 30,563 acres**

- MODIS - NASA Image

***ARIZONA***

***UTAH***

***NEVADA***

## Wildfire effects

**High Burn Severity:**
- All vegetation blackened, deep soil heating killing roots/seeds, “baking” of the soil surface.

**Moderate Burn Severity:**
- Patchwork of green and burnt areas. Intermediate between “high” and “low” severity levels.

**Low Burn Severity****:**
- Most vegetation untouched by fire. No significant effect on soil properties or water repellency.

- Acquired Burn Severity Shapefiles

## Affect of Fire on Hydrologic Response and Gridded Flash Flood Potential

**Burn Severity Layers Applied**

**Significant increase high severity areas**

**No Change Low Severity areas**

**Moderate increase for moderate burn**

## Support NWS Flash Flood Warning Program:

**Accounting for Wildfires**

- GIS Functionality Requirements:

- Geoprocessing

- Statistical Information

**Repeat process**

- Geographic query

- Scripting Ability

## Support CBRFC Daily Operations:

**D2D Map Backgrounds**

- No radar coverage over these modeled basins

- GIS Functionality: Preparation of map backgrounds

- Re-projecting
- Buffering
- Dynamic (frequent edit)
- Non-NWS Source (format)

**Notes:**
Dynamic layers – maintain geographic relationships/topography

## Support CBRFC Daily Operations:

**Expand QPF Ability**

## Support CBRFC Daily Operations:

**Expand QPF Ability**

- Utilizing Elevation Data

- Aspect Information

- &

- Expand PRISM & QPF ability to Mexico headwater basins

- GIS Functionality: Require cell-by-cell comparison of elevation, aspect, precipitation attributes, zonal functions

**Arizona/Mexico Border**

## Support CBRFC Users:

**Support CBRFC Users:**

**UDOT – Culverts in FF prone locations?**

- Gridded FFPI

- Road Network

## Support CBRFC Users: Bureau of Reclamation

**Weather Modification Project**

- GIS geo-processing functionality:

- Identify the modeled basins affected by the operation

- Determine the percent of sub-basin areas where runoff contribution would be affected.

- Adjust appropriate model parameters.

- Provide a summary of results