WWRC 97-05bb
Cumulative Hydrologic Impact Assessments on Surface Water in Northeastern Wyoming
Using HEC-1: A Pilot Study
Abstract
The purpose of this study was to perform an
assessment of the affect of mining on the total
discharge of an impacted watershed in Northeastern
Wyoming. The surface water model HEC-1 was
used to model four separate rainfall-runoff events
that occurred in the study basin over three years
(1978-1980). Although these storms were used to
represent pre-mining conditions, they occurred
during the early stages of mining and the models
were adjusted accordingly. The events were selected
for completeness of record and antecedent moisture
conditions (AMC). Models were calibrated to the
study events and model inputs were altered to
reflect post mining conditions. The same events
were then analyzed with the new model inputs. Peak
flow, total discharge and timing of flows were
compared for pre-mining and post-mining models.
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