MUD CREEK WATERSHED STUDY PUBLIC MEETING NOVEMBER 7, 2013
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1 MUD CREEK WATERSHED STUDY PUBLIC MEETING NOVEMBER 7, 2013
2 AGENDA Purpose of Study Hydrology Hydraulics Floodplain Mapping Floodplain Management Options
3 PURPOSE OF STUDY Upstream Development Near I-80 Bondurant Flooding Issues Altoona Growth Preemptive Management Strategies NE 96 th Street Funding
4 Mud Creek Watershed Study HYDROLOGY
5 HYDROLOGY Definition To study the occurrence, distribution, and circulation of water on and below the Earth s surface. In Other Words How much water is in Mud Creek?
6 HYDROLOGY New Detailed Study From headwaters to confluence with Des Moines River Existing Conditions Future Conditions Land use plan through 2030
7
8 PRECIPITATION
9 IOWA S HISTORIC RAINFALL EVENTS inch daily rainfall on 6/14/1998 (official record) Atlantic, Iowa inch daily rainfall on 7/2/1958 Audubon, Iowa inch daily rainfall on 7/17/1996 Castana, Iowa inch rainfall in 18 hours on 7/27/2011 Dubuque, Iowa inch daily rainfall on 9/18/1926 (unofficial record) Boyden, Sioux Co. Iowa
10 ANKENY YEARLY RAINFALL 70 Ankeny Airport Yearly Rainfall (inches) 60 Average Annual Rainfall Total
11 PROBABILITY OF ANOTHER FLOOD What is the meaning of flood probability?
12 WHEN TO EXPECT ANOTHER 100 YEAR FLOOD
13 PEAK FLOOD FLOWS - CFS What is a CFS? Cubic feet per second is a measurement of volume passing by a point every second gallons of water per second Mud Creek at NE 80 th Street can convey approximately 2,500 CFS with banks full.
14 DESIGN FLOW DETERMINATION Event Year Source Flow (cfs) Location Effective 1% Annual Exceedance Probability Flow Updated 1% Annual Exceedance Probability Flow 1982 Flood Insurance Study 2013 Snyder and Associates 5,940 Highway 163 8,600 Highway 163
15 Mud Creek Watershed Study HYDRAULICS
16 HYDRAULICS New Detailed Study From NE 27 th Avenue To NE 62 nd Avenue NE 62 nd Avenue NE 54 th Avenue NE 46 th Avenue NE 27 th Avenue
17 HYDRAULICS Elevation & Survey Data Field survey of all structures LiDAR data
18 HYDRAULICS How deep does the water get in Mud Creek?
19 Mud Creek Watershed Study FLOODPLAIN MAPPING
20 FLOODPLAIN MAPPING Floodplain Terminology Mud Creek Flood Mapping
21 FLOODPLAIN TERMINOLOGY FLOODWAY FRINGE STREAM CHANNEL FLOODWAY FLOODPLAIN FLOODWAY FRINGE
22 MUD CREEK FLOOD MAPPING Mapping 100 Year and 500 Year Existing Conditions Future Conditions No change in development practices up to 2030 Mapped using LiDAR data Compare to existing floodplain
23 MUD CREEK FLOOD MAPPING Blue =Unofficial Existing Green = FEMA
24 MUD CREEK FLOOD MAPPING Blue = Unofficial Existing Red = Future
25 Mud Creek Watershed Study FLOODPLAIN MANAGEMENT OPTIONS
26 FLOODPLAIN MANAGEMENT OPTIONS Minimum Management Criteria Above Minimum Criteria Regional/Site Detention Water Quality Design
27 MINIMUM MANAGEMENT CRITERIA FLOODWAY FLOODPLAIN
28 MINIMUM MANAGEMENT CRITERIA FLOODWAY FLOODPLAIN
29 MINIMUM MANAGEMENT CRITERIA FLOODWAY
30 MINIMUM MANAGEMENT CRITERIA Minimum National Flood Insurance Program requirements Development allowed in Floodway Fringe 1 above 100 year flood Points of Consideration Allows for them most developable area Highest risk for future flood impacts
31 ABOVE MINIMUM MANAGEMENT Polk County Criteria Fill criteria (No more than 5 feet of fill) Proximity to Floodway (Set back 25 feet) Higher than 1 above 100-year flood No development in the floodplain Points of Consideration Reduces developable area Lower risk for future flood impacts
32 ABOVE MINIMUM MANAGEMENT Polk County Criteria 25 ft 25 ft 5 ft or less FLOODWAY FLOODPLAIN Setback
33 ABOVE MINIMUM MANAGEMENT Higher than 1 above 100-year flood 1 Above 100 Year Floodplain
34 ABOVE MINIMUM MANAGEMENT No Development in the floodplain FLOODWAY FLOODPLAIN
35 REGIONAL/SITE DETENTION Effort to mimic pre-development hydrology High cost to build and maintain Possible regional detention Estimate of detention volume
36 REGIONAL/SITE DETENTION
37 WATER QUALITY DESIGN Does not address increased volume Detain first 1.25 of precipitation Treats up to 90% of all rain events Stabilizes stream flow
38 MUD CREEK WATERSHED STUDY SEE MAPS AROUND ROOM NEWS TO KNOW PUBLIC MEETING NOVEMBER 7, 2013
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