HYDRO20750

• Permit No: C1980007
• IBM Index Class Name: Hydrology
• Doc Date: 7/5/2005
• Doc Name: Evaluating the Effectiveness of Postfire Rehabilitation Treatments
• From: MCC
• To: DMG
• Permit Index Doc Type: Correspondence
• Media Type: D
• Archive: No

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Flgure T-BAER spending by Region for high severity bum Flgure 9-Cost per area for BAER treatment on high severity
areas in 1999 dollars, 1973-1998 from Burned Area Reports. burned sites in 1999 dollars, 1973-1998 from Burned Area
Reports.
Erosion Estimates 3.5

The Burned Area Report form asks for an eroaicn w 3.0
hazard rating for each fire. The rating is divided into N

low, moderate, and high erosion hazards categories.
w 2 s
For the 321 project fires, the ratio of high erosion LL z.o
areas to high bum severity areas was greater than o
one (fig. 10). More areas were rated high erosion q ~ 1.s
hazard than just those with high burn severity. This =
was probably due to natural erosion hazards associ- z
0 1.0
atedwithlocalgeology,geomorphology,andprecipita- o 0
5
tion patterns. Regions 2 and 4 both have high ratios W .

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REGION
100
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80 N c
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aw
40 ~ LL
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Flgure 8-Cost per area for BAER Veatmentfor Forest Service
Systems lands by Region in 1999 dollars, 1973-1998 from
Burned Area Reports.
^ HIGH
p MODERATE
^LOW
1 2 3 4 5 8
REGIONS
Flgure 1!>-Average ratio of areas described as low, moderate,
and high erosion hazard to areas of low, moderate, and high
bum severity by Region from Burned Area Reports.
due to conditions such as granitic soils and steep
elopes, which create naturally high erosion hazards.
On the other hand, in all regions the ratio of low
erosion hazard areas to low bum severity areas was
low, indicating that erosion potential was small.
A wide range of erosion potential estimates and
watershed sediment yield (delivered to the channel)
potential estimates was found in the Burned Area
Report forma, some withvery highvaluea that couldbe
considered unrealistic(fi~. l1). Erosion potentialvaried
from 1 to 7,000 ton ac (2 to 15,600 Mg ha 1), and
sediment yield varied over sis orders of magnitude.
Erosion potential and sediment yield potential did not
correlate well (r = 0.18, n = 117). Different methods
26 USDA Forest Service Gen. Tech. Rep. RMRS-GTRE3. 2000