Klotz at TFMA Fall 2008

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Information about Klotz at TFMA Fall 2008
Education

Published on November 13, 2008

Author: gusgraham

Source: authorstream.com

Using GIS to Evaluate Benefits of Flood Reduction in Sewered Areas : Using GIS to Evaluate Benefits of Flood Reduction in Sewered Areas November 5, 2008 Introductions : Introductions Fergus Graham, PE Storm Water Division, Klotz Associates, Inc., Houston, TX Background Originally from Glasgow, Scotland 10 years of experience in Water, Wastewater & Stormwater Post Graduate Degree in Information Technology Passionate about the application of GIS and technology in engineering Glossary of Terms : Glossary of Terms Amur I am Amurny I am not Burn Stream Dreich Misty Weather Haud yer weesht Be quiet! Thon That One Youse Y’all Project Description : Project Description Client City of Houston Project Name Phase I Design Services for: Shepherd Westmoreland Glen Oak Purpose Identify Problems & Develop Design Alternatives Estimate Costs & Recommend Preferred Alternative Prepare Preliminary Engineering Report Project Location : Project Location Design Goals : Design Goals Design Criteria City of Houston Design Manual (Chapter 9) City of Houston Technical Paper 100 City of Houston Technical Paper 101 Basic Design Steps Analyze Existing System for 2 Year event Define Existing Problems Design Proposed System for 2 Year Event Analyze Proposed System for 100 Year Event Design Overland Flow Control for 100 Year Event Locating Problem Areas : Locating Problem Areas Flood Complaint Data Source: 311 Call Centre Data: Flood Complaint Location Flooding Type: Street Flooding Passable Impassable House Flooding No. of Instances Complaint Map : Complaint Map Basic Complaint Density Map : Basic Complaint Density Map Weighting/Scoring Complaints : Weighting/Scoring Complaints Simple Additive Score All Points Score 1 for being a complaint +1 if includes Street Flooding +1 if impassable +1 if includes House Flooding Weighted Score All Points Score 1 x w1 for being a complaint +1 x w2 if includes Street Flooding +1 x w3 if includes impassable +1 x w4 if includes House Flooding w1 + w2 + w3 + w4 = 1 Weighted Complaint Density Map : Weighted Complaint Density Map Basic Complaint Density Map : Basic Complaint Density Map Weighted Complaint Density Map : Weighted Complaint Density Map Overland Flow Analysis : Overland Flow Analysis City of Houston Methodology 4 Methods: Method 1 – Hydraulic Grade Line Analysis Method 2 – Conduit & Overland Flow Analysis Method 3 – Conduit & Overland Flow with Storage Method 4 – Dynamic Flow Routing Analysis Method 1 : Method 1 Proposed Design Analyzed at the 100-Year Event HGL must be below Maximum Ponding Elevation MPE is the elevation of natural ground at the road ROW Also need to consider maximum allowable street ponding: 6” at high points 18” at low points 100-Year HGL negates overland storage. Results in over-sized conduits. Method 2 : Method 2 Method 3 : Method 3 Method 4 : Method 4 Time consuming dynamic model 1D model not always adequate for overland flow Assumes that overland flow travels in the same general direction as sub-surface flow GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis GIS Overland Flow Analysis : GIS Overland Flow Analysis Benefit Analysis : Benefit Analysis Benefits often difficult to assess Huge advantage in selecting a solution GIS allows us to: Visually identify and quantify benefits of various proposed solutions Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis Benefit Analysis : Benefit Analysis 2-yr Return Period Losses: Existing Condition = $458,157 Proposed Condition = $169,005 These losses can be accumulated over the lifetime of the proposed system and compared to other proposed conditions. Perhaps not an absolute benefit….but certainly relative Thanks for your attention!Questions? : Thanks for your attention!Questions?

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