Lake Ralph Hall Upper Trinity Basin Texas Team

Lake Ralph Hall Upper Trinity Basin, Texas Team 9 MOSAED ALRASHIDI, SCOTT GRZYB, SARA MCNEIL, CARLOS MENDEZ 05/07/2015 Hydraulic Engineering Design Spring/2015

Background Information and Problem q. Location: Fannin County (Upper Trinity Regional Water District) q. Problem: Water shortage due to population growth q. Inaction = Water deficit by 2025 Source: City of Ladonia Website

Design Criteria Reservoir Specifications: q Active Storage Capacity = 180, 000 acre-ft q Flood attenuation of a 100 year storm with freeboard of at least 5 ft. q Estimated time to fill the reservoir = 3 years Source: City of Ladonia Website

Design Processes Surface Area (acre) 14000. 00 12000. 00 10000. 00 8000. 00 6000. 00 4000. 00 2000. 00 573 555' 563 553 543 180, 000 acre-ft Elevation (ft_above MSL) 100 Year Storm 50 Year Storm 10 Year Storm 533 523 513 503 493 483 473 0 50, 000 100, 000 150, 000 200, 000 Volume (acre-ft) Volume 250, 000 Surface Area 300, 000 350, 000 400, 000

Creation of Lake Ralph Hall ● 58 catchments

4 Scenarios *Storm data acquired from Dallas County drainage Criteria *Models were run in HEC-HMS for 30 days at 15 min increments

Design Evaluation ? Emergency Spillway ? Primary Spillway Environmental Orifices ?

Scenario A: 100 year storm with freeboard 20 ft

Scenario A: Water elevation does not reach dam top. Environmental Orifice Auxiliary Orifice Weir Safety Spillway Dam Top

Comparison of Scenarios spillway Active Zone

Design Impact

Final Design Decision

Acknowledgements • Thank you Dr. David Maidment for your supervising and suggesting we do this project. • Thank you Cynthia for providing the Basin model.

Questions?