Using GIS to Inventory and Map Rapid City, South Dakota s Major Drainage Elements
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1 Using GIS to Inventory and Map Rapid City, South Dakota s Major Drainage Elements Jenifer Sorensen, PE, PhD FourFront Design, Inc. Dion Lowe, PE City of Rapid City Stormwater Program
2 Stormwater - Definition Precipitation runoff Drains into natural or manmade drainage ways In urban areas, drains into streets and storm sewers No water treatment before entering water bodies
3 Impacts of Changes in Runoff
4 Stormwater Issues Flooding risk Erosion Water Quality suspended solids, nutrients, chemicals, bugs Asset Management Environmental Impact point and nonpoint pollution sources
5 Ways to Manage Stormwater Traditional approach Move water through system as quickly as possible Does not control pollution Does not reduce runoff amounts Results in downstream flooding; poor water quality Integrated Systems Approach Combine preventive and control measures Minimize pollution and runoff through BMPs Manage pollution and runoff to minimize impacts Requires site planning, more natural drainage systems
6 Stormwater Control Control measures used to control volume and peak discharge Open channels swales Vegetative control Engineered vegetated channels Act as natural biofilter Detention cells Reduce peak discharge rates and pollution More land intensive and expensive
7 NPDES Phase II Stormwater Permit Rules Rapid City must comply because population > 10,000 Clean Water Act federal mandate 5 year permit up for renewal in January 2008 Permit covers: Public education and outreach Public involvement and participation Illicit discharge detection and elimination Construction site runoff control Post-construction stormwater management Pollution prevention for municipal operations
8 Need for GIS Project NPDES Phase II stormwater permit requirement Goal under illicit discharge detection and elimination to have storm sewer map in GIS City did not know how many elements there are and where they are located If/when funding available for construction/maintenance, can use GIS to prioritize projects HB 1125: cities now able to charge property owners storm sewer utility fees
9 Rapid City Drainage Basins
10 Rapid City Drainage Basins
11 Drainage Basin Design Plans Have 20 DBDPs written between 1989 and 2005 by different firms Based on hydraulic modeling Narrative descriptions of elements Schematic drawings not to scale Sub-basins of Haines Avenue DB
12 Map Detail Drainage Basin Design Plans
13 Project Tasks Read 20 Drainage Basin Design Plans Set up data fields Data creation/modification of elements Field assessment/data collection Photos of elements Data entry DBDPs Assessment
14 Data Fields
15 14 of 20 drainage basins completed Total elements in 20 plans: channels 204 detention cells Channels: 86% (608) existing 14% (97) proposed Detention cells: 65% (133) existing 35% (71) proposed Project Status
16 Improvement Recommendations made in 20 DBDPs: 56%(393) Yes 44% (312) No Channel Elements
17 Improvement Recommendations made in 20 DBDPs: 81%(165) Yes 19% (39) No Detention Cell Elements
18 Outfalls for the 14 Drainage Basins Completed: Outfalls: 51 Yes 404 No
19 Details of Three Drainage Basins
20 Meade Hawthorne Drainage Basin
21 Meade Hawthorne Drainage Basin Existing Elements
22 Meade Hawthorne Drainage Basin MH241
23 Meade Hawthorne Drainage Basin MH49
24 Meade Hawthorne Drainage Basin MH41
25 Meade Hawthorne Drainage Basin MH13
26 County Heights Drainage Basin
27 County Heights Drainage Basin CH100
28 CH15 County Heights Drainage Basin
29 CH102 County Heights Drainage Basin
30 CH13 County Heights Drainage Basin
31 Arrowhead Drainage Basin
32 AH1 Arrowhead Drainage Basin
33 AH5 Arrowhead Drainage Basin
34 AH9 Arrowhead Drainage Basin
35 AH17 Arrowhead Drainage Basin
36 AH302 Arrowhead Drainage Basin
37 Arrowhead Drainage Basin AH23
38 Some Ways Rapid City Will Use the GIS Drainage Data: Review elements before going into the field Quantify elements and their characteristics Public education and involvement Maps Use by other city employees engineering/planning/public works/growth management Use with volunteers
39 Future Possibilities with GIS Drainage Data Asset management prioritize infrastructure maintenance Add construction costs as an attribute Maintenance records Track complaints Further assist with NPDES permit implementation Adapt to hydraulic model Assist with stormwater management master planning
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