Dewayne Smith, P.E. Hydro Engineering Solutions, LLC
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1 23 rd Annual Nonpoint Source Conference 24 January 2012 City of Hoover Cost Effective Tools for MS4 Permit Compliance By: Dewayne Smith, P.E. Hydro Engineering Solutions, LLC
2 City of Hoover Incorporated in 1967 Size mi² 2000 Population 73, Population 81,619 Growth 11.81% 6 th Largest City in Alabama
3 City of Hoover Phase I MS4 NPDES Permit Limited Funding & Resources Corporate Limits Comingled with other cities Extend over a large area Multiple Watersheds Water Quality Impacts Active Environmental Groups
4 MS4 Program Tools Rainfall Data Water Quality Data Watershed Modeling
5 MS4 Program Elements Construction Program Pesticide, Herbicide and Fertilizer New Development / Redevelopment Illicit Discharge Floodplain Monitoring
6 Rainfall Data
7 Rainfall Data Proprietary software that leverages Doppler-based feeds to deliver precipitation measurements 5 minute intervals 24 hours/day 7 days/week 365 days/year Provides rainfall data for any location without installing equipment Quality controlled data Eliminates factors that degrade the reliability and accuracy of traditional gauge-based systems ADEM Approved Technology
8 Doppler Radar Coverage
9 RainWave Reports Alerts Monthly Report Daily Report
10 Storm Event Evaluation Hyetograph 2.92 in - 1 Hour Technical Paper Year, 1-Hour 18 June 2010 Storm Event HE NGINEERING S
11 Level Data Gauge Level Logger Locations HE NGINEERING S
12 Level and Rainfall Data HE NGINEERING S
13 Non Storm Water Discharge HE NGINEERING S
14 Benefits provides: Better information to make better decisions Watershed specific rainfall data Eliminates need of installing gauges alerts and documentation Rainfall data for watershed models Better use of limited staff and resources
15 Water Quality Data Southland Drive Kestwick Drive
16 Continuous Monitoring In-Situ Troll 9500 Level Dissolved Oxygen Turbidity Pressure ph ORP Specific Conductance
17 Data Availability
18 Data Analysis
19 Storm Water Sampling Permit Requirements 72-hours of Dry Weather Minimum of 0.10 inches of rain RainWave (First Flush) No Rain Alert Rain Alert Rainfall has started Notification when rainfall exceeds approximately 0.10 inches Storm Event Documentation
20 No Rain Alert Rainfall 1:20 am 17 January Hours No Rain Alert
21 Rain Alert Rain 5:50 pm Sample 7:10 pm 0.32 in Rainfall 4:00 pm No Rain Alert
22 These tools provide: Benefits Real time water quality data Better information to make better decisions Alerts to identify water quality concerns Data to evaluate water quality trends Information to identify and document manual sampling events Better use of limited staff and resources
23 Watershed Modeling Soils Data Land Use
24 GSSHA Model Gridded Surface Subsurface Hydrologic Analysis (GSSHA) Model 2D Overland Flow Model Water Quality Capabilities Input Data Topography Land Use Soils Rainfall
25 Automated Model Watershed Specific Based on HEC-1 methodology Rainfall Data Estimates Daily Peak Discharges Generates Daily Hydrograph Determine Recurrence Interval
26 Storm Hydrograph
27 Pollutant Loads Rainfall Data Watershed Model Storm Hydrograph Water Quality Data Pollutant Loads
28 These tools provide: Benefits Better understanding of the watershed Identify pollution sources Better information to make better decisions Better estimate of pollutant loadings Evaluate the effectiveness of BMPs Evaluate new BMPs to reduce pollution Helps the City effectively apply resources and funding to improve water quality
29 QUESTIONS HE NGINEERING S
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