The use of low head weirs to. perennial streams with their floodplains:
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1 The use of low head weirs to reconnect severely entrenched perennial streams with their floodplains: An Anne Arundel County TMDL Watershed Implementation Plan Strategy presented by Hala Flores, P.E Mid Atlantic Stream Restoration Conference November 16, 2011 Rocky Gap, Maryland Ron Bowen, P.E.
2 Outline Current Condition Assessment for Streams in Anne Arundel County Instream weir design A water quality strategy for meeting sediment and nutrient TMDLs in Maryland Implementation examples Conclusion
3 DEGRADED MORPHOLOGY Example of F and G channels Highly Instable Erosion Patuxent River Watershed Headcut South River Watershed
4 ESTIMATED SEDIMENT YIELD Perennial Stream Miles Assessed: Not Assessed
5 Conventional upland BMPs do not necessarily correlate with a stable downstream! Stormwater detention ponds are wet structures that are often used to capture and detain stormwater runoff from residential and commercial areas. Erosion and Headcut Inventory Impervious Area Draining to BMP Less than 20% 20%< and >50% 50%< and >75% More than 75%
6 SPSCs What are they? SPSCs are open-channel conveyance structures that convert, through attenuation pools and a sand seepage filter, surface storm flow to shallow groundwater flow. Step Pool Storm Conveyance Ephemeral Application Wetland Seepage System Perennial Application
7 A,?? STEP POOL STORM CONVEYANCE FOR EPHEMERAL OUTFALLS B, 32% The physical characteristics of the SPSC channel are best characterized by the Rosgen A or B stream classification types, where bedform occurs as a step/pool, cascading channel which often stores large amounts of sediment in the pools associated with debris dams (Rosgen, 1996).
8 WETLAND SEEPAGE RESTORATION TECHNIQUE FOR PERRENIAL STREAMS DA, 28%
9 What are In-stream Weirs: -Sandstone cobble Weirs are used to form 4 ft low head dam lifts to encourage the upstream floodplain to build up to its restored levels - Maximum slope is 10% - Maximum Height = 4 ft. Impact/Connected Length
10 In-stream Weir Typical Detail: Flow Sandstone Boulder Cascade Silica Cobbles On upstream face Sand bags on upstream face Profile along channel Centerline
11 In-stream Weir Typical Detail: Incised Channel Historic Floodplain Parabolic Channel Reference Baseflow Width and Depth Maximum 4 ft height at Weir, taper toward downstream to tie in with existing grade downstream Instream Weir/Cascade Cross-Section
12 In-stream Weir Implementation Scenarios: - Restoring incised perennial channels - Connecting perennial streams to floodplain - Arresting Headcut - Protecting public infrastructure
13 A breakdown of the cost of Stream Restoration per MDE standards Baseline Credit (TN = 0.02 lb/lf, TP = lb/lf, TSS = 2.55 lb/lf) MDE Criteria: Stream stabilization and restoration projects that connect incised and degraded streams to their Floodplain. AACO uses Instream Weir technology at incised Sections to connect a stream segment to the floodplain. MDE specifies Impervious acreage treated = 1 acre/100 linear feet of stream connected/restored Historic Cost Records for In-stream Weir projects in AA County: Project Name Wells Gambrills Road Wells Aurora Hills Science Drive Stream Restoration Picture Spring Branch Instream Weir Severn Run Instream Weir Restoration Length (Ft) Cost Unit Cost ($/LF) 170 $ 15, $ 15, $ 75, $ 60, $ 30, Unit Cost ($/Impervious Acres) Severn Run Mainstem, 3 feet high 30 ft long instream weir was used to connect 150 feet of stream to the floodplain.
14 Unit Cost Comparison for TMDL Implementation Strategies $/(Acres of Impervious Area $/(lbs TN WIP BMP strategy Treated) Removed) Rain Gardens (Bioretention) $51,581 4,604 Rain Barrels $104,544 23,327 Planting of Urban Pervious Lands $59,125 9,430 Pond Retrofits $25,966 4,932 Ephemeral Stream/Pipe Outfall Retrofits with regenerative SPSC Systems $34,859 2,854 Perennial Stream Restoration (Instream Weir) $8,077 4,039 Perennial Stream Restoration (regenerative Wetland Seepage) $20,414 3,215 Average $43,509 $7,486 Unit cost of Conservation planting is per pervious acre and not impervious acre since it is cost prohibitive to remove impervious to plant trees.
15 Anne Arundel County Government TMDL Watershed Implementation Plan Stream Restoration Stream Order < 2 and severely incised are restored with In-stream weirs Degraded and Severely Degraded Streams Stream Miles to be TN Removed Order restored (lbs/year) Total Cost $552, ,467 $139,812, ,243 $20,876, ,982 $11,907, ,473 $3,497, $418,142 Total ,230 $177,063,866
16 National Business Park Instream weir downstream of outfall restoration Mitigation for upstream development draining to an inadequate oufall
17 National Business Park Instream weir downstream of outfall restoration Mitigation for upstream development draining to an inadequate oufall
18 Severn Run Mainstem Before Instream Weir Temporary Fix Stream incision exposed sewer line crossing
19 Severn Run Mainstem Severn Run directly Mainstem after After construction InstreamWeir Sewer Crossing
20 Severn Run Mainstem After Tropical Storm Lee Sewer line crossing
21 Severn Run Mainstem Upstream Channel Clarity
22 Severn Run Mainstem Before Instream Weir Temporary Fix Aurora Hills - Tributary to Wells Branch Restoration Protect upstream tributary restoration
23 Severn Run Mainstem Before Instream Weir Temporary Fix Aurora Hills - Tributary to Wells Branch Restoration Protect upstream tributary restoration
24 Wells Branch Severn Run Upstream Mainstem of After Instream InstreamWeir Weir 2010
25 Wells Branch Upstream of Instream Weir
26 Gambrills Road Culvert Replacement Arrest downstream headcut
27 Severn Run Mainstem Before Instream Weir Temporary Fix Gambrills Road Culvert Replacement Arrest downstream headcut
28 Conclusion In-stream low head weirs are designed d as stable systems Instream weirs can be designed to provide fish passage Instream weirs connect the upstream channel to the floodplain. Instream weirs encourage upstream building of incised channel by trapping transported material. Instream weirs are a cost effective strategy for stream restoration.
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