Grapevine Lake Modeling & Watershed Characteristics

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Presentation transcript:

Grapevine Lake Modeling & Watershed Characteristics Nash Mock

Location & Background Located between Tarrant and Denton counties in North Texas Constructed following the Rivers & Harbors Act of 1945 Built 1948-1952 by the Army Corps of Engineers Dallas/Fort Worth Metroplex flood control, water storage & recreational waters

Digital Elevation Model and NHDPlus Streams Elevation Range: 170-395 ft. Watershed Area: 1799 km2 Lake Surface Area: 29.47 km2 Medium Resolution Reaches Draining to Grapevine Lake: 604 Total Reach Length: 1326 km

Denton Creek Largest GNIS stream draining to Grapevine Lake Stream Length: 147 km Discharge from dam joins the Elm Fork of Trinity River

Reservoir Storage Timeline Dead Pool Conservation Pool Flood Pool/ Emergency Spillway Max Design Elevation Top of Dam 475 ft. 535 ft. 560 ft. 581.9 ft. 588 ft.

2006-2016 Summer Drought History Yellow: Abnormally Dry Light Orange: Moderate Drought Orange: Severe Drought Dark Orange: Extreme Drought Red: Exceptional Drought 2012-2014 corresponds to extended conservation pool period

Watershed Flow Direction Majority of flow east towards dam (purple) Flow around dam directed north (light blue) Anomalous around lake boundaries

Watershed Land Slope Land Slope Range: 0-71% DEM indicates Grapevine Lake is nearly flat Anomalous around lake boundaries

Watershed Flow Accumulation Flow accumulates along northern boundary of lake Appears to jump from watershed above dam location Anomalous around lake boundaries

Grapevine Lake Contours Lake Depth: 70 ft. Contours from Texas Water Development Board 2011 lake survey 1, 2, 5, and 10 ft. contours up to conservation pool elevation

Grapevine Lake Bathymetric Model Used 2 ft. contours to assist rendering Local scene view since earth’s curvature insignificant Extruded contours down from conservation pool elevation Scale and north direction not well represented in 3D

Remaining Work Perform a HAND analysis on the Grapevine Lake watershed. Further improve bathymetric model by extruding polygons between contour polylines.

Questions?