HYDROLOGIC & HYDRAULIC ANALYSES TO RE-ESTABLISH TRIGG BRANCH’S JURISDICTIONAL CHANNEL TO PRE-DAM CONDITION USING HEC-HMS & HEC-RAS MODELS
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Date
2020-12-08Author
Albarqaawee, Razak Ahmed
0000-0002-4304-2468
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Show full item recordAbstract
Birds strikes are the most prevalent cause of airplanes strikes, and retention ponds
near airports are one of the most attractive spots for both immigrant and domestic
wildlife USDA (2017). Since the Trigg Lake, water surface area covers around 46
acres and is located approx. 1.5 miles from four main runways, which make the
lake a perfect shelter for birds to build their nests and eventually strike departing
and/or landing aircraft. Based on a Federal Aviation Administration (FAA)
advisory circular, no retention pond should be constructed within five miles of an
airport nor should it have standing storm runoff for more than 48 hours.
Thus, the objective of this thesis is to downsize the Trigg Lake retention
pond and ensure it becomes dry in less than 48 hours with no effect on downstream
properties nor erosion on streams. Hydrologic and hydraulic models were utilized to establish a baseline and future model’s boundary conditions, existing condition
discharges and water surface elevations will be simulated to help in the proposal of
a flood mitigation system within the Trigg Lake watershed with no retention pond
and no standing storm runoff for more than 48 hours.
The proposed cascaded system of two detention vegetated ponds 1st South of
W. Walnut Hill Ln and East of N. Service Rd with approx.12-acre area and 2nd
pond around Trigg branch jurisdictional channel with approx. 12-acre (S3),
upstream detention pond to control the larger sub-basin runoff (A1), which would
also improve the airfield storm water quality and reduce flooding issue at N. Service
Rd. if an additional underground detention structure is added within the pond A
system. With proposed improvements as described in Chapter 3, the Trigg Lake
area can be downsized to 12 acres instead of the existing 46 acres with less
discharge from the outfall than the existing condition.