GIS Enabled Automated Culvert Design
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1 GIS Enabled Automated Culvert Design ASHTON GREER PH.D. STUDENT, THE UNIVERSITY OF ALABAMA DR. ANDREW GRAETTINGER, LEAH CLIFTON, ZACHARY WILBANKS, BRADFORD WILSON
2 Outline Culvert Background Project Objectives Methodology Tool Validation Tuscaloosa Case Study Results & Conclusions
3 Background Culverts are the most common method of transporting water beneath roadways Often managed and maintained by DOTs Existing infrastructure is aging Design requires timeconsuming spatial analysis
4 Objectives Demonstrate that culverts can be designed within GIS Decrease amount of time spent designing culverts by hand Eliminate need to use multiple types of software (HEC-RAS, HY-8, etc.)
5 Rational Method for Peak Flow Determination Q = CiA Q = peak flow, cfs C = rational method land cover coefficient, dimensionless i = rainfall intensity, in/hr A = drainage area, acres Introduced to the US in 1889 Most widely used peak flow method For urban watersheds < 200 acres Requires multiple spatial inputs
6 Kirpich Method for Time of Concentration T c = L 0.88 s T c = Time of concentration, minutes L = Channel length, ft s = basin slope, ft/ft Occurs when water from most distant point reaches watershed outlet Developed for small basins in Tennessee Adjustment factors for different terrain
7 Methodology Tool developed as Python add-in for ArcMap 10.4 Customization that plugs into ArcGIS Desktop application Utilizes ArcPy geoprocessing functions Automates actions in response to an event
8 Methodology Three categories: Landscape Analysis, Hydrologic Parameter Determination, Design Calculations
9 Required Inputs
10 Landscape Analysis
11 Landscape Analysis
12 Landscape Analysis
13 Landscape Analysis Overall weighted C calculation: C = σ j=1 n (C j A j ) σn j=1 A j Rational method coefficient, C A j = area for land cover j C j = C value for j n = distinct landcover categeories within watershed
14 Landscape Analysis Area, A slope, s s=(e max -E min )/L Flow length, L
15 Hydrologic Parameter Calculations: Flow length, L slope, s Kirpich Equation for Time of Concentration: T c = L 0.88 s 0.385
16 Hydrologic Parameter Calculations: Storm Return Period Time of Concentration, T c Rainfall intensity, i
17 Hydrologic Parameter Calculations: Rational method coefficient, C Rainfall intensity, i Rational Method: Q = CiA Area, A
18 Culvert Design HW D Q AD 0.5 g V = M n R2/3 S o 1/ (Submerged) = C( Q A gd )2 +Y + K s S o HW = TW S o L + (1 + K e + 2gns L K 2 4 n R 3 (Flow Velocity) (Inlet Control) ) Q2 2gA 2 (Outlet Control) Q = peak flow rate, cfs A = Cross-sectional culvert area, ft D = Culvert diameter, ft R = Hydraulic radius, ft G = Gravitational constant, ft/s2 HW = Headwater, ft TW = Tailwater, ft S o = Culvert slope, ft/ft L = Culvert Length, ft n = Manning s coefficient M = conversion constant (1.00) C, Y, K-values = Constants for circular, concrete pipes
19 Culvert Design Each equation must be satisfied Loop iterates through a list of different diameters until conditions are met If conditions cannot be met, user will be notified that an error has occurred HW D Q AD 0.5 g (Submerged) = C( Q A gd )2 +Y + K s S o (Inlet Control) HW = TW S o L + (1 + K e + 2gns L V = M n R2/3 S o 1/2 K 2 4 n R 3 ) Q2 2gA 2 (Flow Velocity) (Outlet Control)
20 Results ArcMap dialog box shows results Results correspond to drawings located in user guide
21 Tool Validation Three rural Tennessee drainage basins were analyzed by hand (left) and with culvert tool (right) Peak flows were within ~ 5 % Culvert ID C Slope (m/m) Flow Length (m) T c (min) i, 10 yr event (cm/hr) Area (km 2 ) Q hand calc (m 3 /s) Q GIS, auto (m 3 /s) Percent Diff. (%) Average % Difference: 3.4
22 Tool Validation Culverts were designed with culvert tool and designed with HY-8 for verification Culvert ID Q GIS, Auto (m 3 /s) Slope (m/m) Length (m) Headwater Constraint (m) Tailwater Value (m) D GIS, auto (m) HY-8 Verification (m)
23 Case Study Data for 197 culverts along AL HWY 69 and HW 43 were recorded in 2003: Material Inlet/Outlet Configuration Diameter Length Depth of Cover
24 Case Study The GIS-based culvert tool was used to redesign 20 of these culverts We hypothesized that our tool would result in larger culverts than those currently existing.
25 Case Study 20 culverts were redesigned in less than 1 hour Of 20 culverts re-designed, 17 resulted in smaller crosssection designs than those currently in place Contrary to our hypothesis, it is possible that some of our existing culverts are engineered for different events or overengineered
26 Conclusions & Future Work Tool dramatically decreases time and effort require to produce a culvert design Demonstrated that multiple culverts could be redesigned quickly Future work: Addition of multiple culvert configurations and flow conditions Addition of channel evaluation for more accurate tailwater depth Batch processing Expansion to other types of infrastructure requiring analysis of elevation and land cover
27 Questions?
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