Impervious Cover as a Indicator and Tool of Watershed Protection
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1 Impervious Cover as a Indicator and Tool of Watershed Protection Tom Schueler Director of Watershed Research & Practice Center for Watershed Protection Ellicott City, MD trs@cwp.org
2 Key Themes A. The strength of the evidence B. Planning implications C. Impervious cover accounting D. Builders for the Bay
3 A. The Strength of the Evidence More than 200 studies on relationship between IC and stream quality Impervious Cover Model CWP (2003). Impacts of Impervious Cover on Aquatic Systems
4 Impervious Cover Can Transform a Watershed in Just a Few Years Under Agriculture Construction Undeveloped Developed Existing Development Undeveloped Developed 1950s 1960s 1970s 1990s 1940s Center for Watershed Protection
5
6 ICM Disclaimer ICM predictions are general, and may not fully apply to every stream. Factors such as stream gradient, stream order, stream type, age of subwatershed development, prior land use, past management practices can and will make some streams depart from these predictions Must be 18 or older to enter. Not valid in TX, UT and AK. APR of 6.15%. Not everyone qualifies for special financing. Offer may restricted due to Acts of God. You can never win. Center not liable for any damages, we don t have any $ even if we are
7 Subwatershed -10% IC
8 Subwatershed - 30% IC
9 Subwatershed - 60% IC
10 Subwatershed - 80% IC
11 Other Watershed Indicators Watershed forest cover (65%) Streamside forest cover (65% of network) Watershed turf cover (?) Road density and vehicle miles travelled (local pollutant emissions)
12 Physical indicators Loss of headwater streams Floodplain encroachment Loss of intact riparian buffer Stream interruption Increased number of crossings/fish barriers
13 Northern Virginia Regional Commission
14 Hydrological Indicators Increased stormwater runoff Increased frequency of flooding Floodplain expansion Diminished baseflow Increased bankfull flooding
15 Relationship Between Watershed Imperviousness (I) and the Storm Runoff Coefficient (Rv) (Source: Schueler, 1987) Runoff Coefficient (Rv) Watershed Imperviousness (%)
16 Stream Habitat Indicators Channel enlargement Increased sediment load Declining stream habitat scores Large woody debris Stream warming
17 IC and Stream Habitat 8-10% < 5% 20% > 65% 30%
18 Source: Leopold, 1994
19
20 10 9 Elevation (ft-msl) Historic cross-section Current cross-section Historic Section Current Section Bankfull Depth Ultimate Section? 2 1 Ultimate cross-section? Cross Section Stations (ft) - Looking Downstream
21 Channel Enlargement as a Function of Impervious Cover Enlargement Ratio as a Function of Impervious Cover Enlargement Ratio (Re)ULT = (ABFL)ULT/(ABFL)PRE All Other Data Watts Branch Data Regressed Enlargement Curve Imperviousness (%)
22 Water quality indicators Violations of Bacteria standards Nutrients and eutrophication Aquatic life toxicity Sediment contamination Trash and debris loads
23
24 Aquatic Diversity Indicators Aquatic Insect Diversity Sensitive Insects Fish Diversity Scores Trout and Salmon Wetland and Floodplain Plant Diversity Amphibian Diversity
25 Fairfax Co, VA Copyright 2000, Center for Watershed Protection
26 IC also associated with: Urban heat islands vehicle pollutant emissions PAH and metal levels in sediments.forest fragmentation.loss of streamside forest cover.increased risks of spills, leaks, illicit discharges, illegal dumping and sewer overflows bacteria sources.shellfish and beach closure and many other factors
27 IC: Thresholds and Locations No actual thresholds for individual indicators (variability) Thresholds do make sense for groups of indicators Some individual species have lower thresholds (e.g., brook and brown trout) Location of IC not real important factor (pipes)
28 IC: The Case for Caps Site IC is not static over time 20% of households add IC each decade (US Census, 2002) Replacement of landscaping every 10 years Turf Cover (lawn compaction and runoff) Watershed IC is most important planning variable Can be measured, managed, tracked and traded Should be used judiciously Conservative: until other tools are tested
29 B. Planning Implications Stream Classification Watershed Vulnerability Impervious Cover Caps
30 Sensitive Streams [2 to 10% IC] Key Issue: Predicts that even low intensity residential development will degrade streams w/o watershed treatment Aggressive down-zoning, land conservation, and buffers. No sewers. Other indicators (FC, RFC, TC) may be more predictive
31 Impacted Streams 10 to 25% IC Show clear signs of declining stream health Stream indicators in the fair to good range Stream corridor may still be intact Available land in subwatershed to install practices Streams have highest restoration potential
32 Non-Supporting Streams 25 to 60% IC Do not support a full range of designated uses Stream indicators in the fair to poor range Streams in 25 to 40% IC show promise for stream restoration Primary goals are to reduce pollutant loads, improve stream corridor or enhance appearance Allow water contact recreation during dry weather
33 Urban Drainage 60 to 100% IC Stream corridor eliminated or altered Primarily functions as a conduit for storm water Water quality and aquatic diversity: poor to very poor Channels are highly unstable, where they still exist Limited prospects for stream restoration Still possible to lower downstream pollutant export
34 The Small Urban Watershed Restoration Manual Series Organizing To Restore Watersheds Alteration of Urban Watersheds Impacts of Urbanization on Streams Range of Subwatershed Restoration Practices Envisioning Restoration Framework for Subwatershed Planning Available for free download at
35 Current and future IC real helpful in screening most vulnerable and/or restorable watersheds
36 IC is but one of eight tools needed to protect local watersheds Center for Watershed Protection
37 C. Impervious Cover Accounting Total Vs. Effective Impervious Cover Land Use/IC Relationships Effect of BMPs on ICM Stormwater Credits (MD Stormwater Manual) IC: Watershed Planning vs. Site Design
38 Total Impervious vs. Effective Cover Total best at watershed scale, effective at site scale)
39 Disconnecting IC is a key site design strategy but not yet a watershed protection strategy Direct Connection Connected; Flowing to Impervious Surface Disconnected; Flowing to Pervious Surface Source: Roger Bannerman Disconnected; Flowing to Disconnected; Flowing to Rain Garden
40 Center for Watershed Protection Ag = 1.9% 2 Acre Res. = 10.6% Impervious Cover Land Use Relationships 1 Acre Res. = 14.3 % ½ Acre Res. = 21.2 %
41 Center for Watershed Protection ¼ Acre Residential = 27.8 % 1/8 Acre Residential = 32.6 % Low Variability within Zoning Category Townhome Residential = 40.9 % Multifamily Residential = 44.4 %
42 Center for Watershed Protection Data from 4 Suburban Counties (CWP, 2001) Light Industrial = 53.4 % Commercial = 72.2 %
43 Can BMPs make a difference? No BMP can address all IC impacts Designed for and effective in pollutant removal No strong evidence that they protection stream quality (yet) Maintenance and lack of full watershed treatment
44 Credits promote better site design Next step: Setting forest canopy goals for the site and watershed
45 D. Reducing IC in Site Design 65% of Impervious Cover is For Car Habitat County codes create needless impervious cover (especially road design) Local roundtables have proven effective in changing codes
46 An Agreement signed December 3, 2001 by the Center for Watershed Protection, the Alliance for the Chesapeake Bay, and the National Association of Homebuilders Conduct 12 local site planning roundtables A completely voluntary program
47 Codes & Ordinances Worksheet (COW) Compares local development rules to 67 site planning benchmarks 100 points are possible Overall score indicates how environmentally friendly your codes are Also helps identify specific rules to change Cow
48 Photo source: Randall Arendt Open space design reduces lawn area, preserves trees, and is more attractive Alternative turnarounds use less pavement Treed lots increase marketability and resale Narrow streets have less environmental impact AND reduce speeds Preserved wooded lots provide recreation
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