Cumulative hydrologic impact assessments on surface-water in northeastern Wyoming using HEC-1; a pilot study

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:613865

Anderson, A J; Eastwood, D C; Anderson, M E ^[1]

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1. Univ. of Wyoming, Laramie, WY (United States)

The Surface Mining Control and Reclamation Act of 1977 requires that areas in which multiple mines will affect one watershed be analyzed and the cumulative impacts of all mining on the watershed be assessed. The purpose of the subject study was to conduct a cumulative hydrologic impact assessment (CHIA) for surface-water on a watershed in northeastern Wyoming that is currently being impacted by three mines. An assessment of the mining impact`s affect on the total discharge of the watershed is required to determine whether or not material damage to downstream water rights is likely to occur as a result of surface mining and reclamation. 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. The results were compared with the pre-mining calibration. Peak flow, total discharge and timing of flows were compared for pre-mining and post-mining models. Data were turned over to the State of Wyoming for assessment of whether material damage to downstream water rights is likely to occur.

• OSTI ID: 613865
• Report Number(s): CONF-9705128--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
29 ENERGY PLANNING, POLICY, AND ECONOMY
54 ENVIRONMENTAL SCIENCES
DATA COMPILATION
ENVIRONMENTAL EFFECTS
HYDROLOGY
LAND RECLAMATION
REMEDIAL ACTION
SITE CHARACTERIZATION
SURFACE MINING
SURFACE WATERS
WATER QUALITY
WYOMING