Consultants in Natural Resources and the EnvironmentEstablished 1981

• Develop Habitat Design Criteria• Review of Impact Ecological Function Units (EFUs)• Review Mitigation Area Baseline EFUs• Review Mitigation Area Preliminary Design EFUs• EFU Update Report and GIS Database• On-site Groundwater Well Monitoring

Chatfield ReallocationEcological Functions Analysis

Preble’sHabitat

Mapping

WetlandHabitat

Mapping

Define and assignan EFI value

for each resource

Calculate habitatdegradationsince 2011

Calculatepredicted

degradationReview EM-2

EFU lift EFU protection

Map habitatpolygons for eachresource/establish

baseline for maximuminundation levels

Complete fieldassessment

and data forms

Calculate Debitsand Credits

DebitsCalculate the Chatfieldreallocation impacts for

maximum reservoirelevation and convert

to EFU

BirdHabitat

Mapping

CreditsCalculate baseline EFUs for on-site mitigation areas

Present 10 Years 20 Years

Observed

Projected

ProjectedExistingCondition

Time

LowQuality

HighQuality

Future without Protection

Future with Extensive Protection

Future with Moderate Protection

Future with Basic Protection

Hab

itat q

ualit

y du

e to

hea

d cu

tting

30 Years

Preservation Concept Adapted from Clayton Ridenour/Corps.

U.S. Army Corps of Engineers and Chatfield Reservoir Mitigation Company, Inc.

Headcutting along Plum creek