Indian BrookIndian BrookStream Geomorphic Stream Geomorphic

AssesmentAssesmentPhase I ProtocolPhase I Protocol

Essex and Colchester, Essex and Colchester, VermontVermont

Danica LefeverDanica Lefever

April 29, 2005April 29, 2005

WatershedOverview

Colchester

Essex

Malletts Bay

EssexJunction

6.3% impervious cover6.3% impervious cover 30.6 sq. km.30.6 sq. km. Approximately half of Approximately half of

total watershed total watershed designated as impaireddesignated as impaired

Essex Jct. between Educational Dr. and Rt. 15Essex Jct. between Educational Dr. and Rt. 15

Essex – Upstream of Susie Wilson Rd.Essex – Upstream of Susie Wilson Rd.

Impaired portion

Impaired portion ofwatershed

http://www.anr.state.vt.us/dec/waterq/stormwater/images/sw_indianmap.gif

Essex Landfill

Colchester Stormwater Sewers

Very minimal Very minimal stormwater outfall stormwater outfall impacts in Colchesterimpacts in Colchester

Relatively wide buffer Relatively wide buffer in Reaches 1-6in Reaches 1-6

Lang Farms Golf Course

New Condos

Essex and Essex Junction Stormwater Sewer Lines

Reference ConditionsReference ConditionsStep 2Step 2

Step 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.1 2.11 Elevation Valley Valley Channel Channel Watershed Channel Valley Confinement Reference Up Down Length Slope Length Slope Sinuosity Area Width Width Ratio Type Stream BedformReach ID (ft.) (ft.) (ft.) (%) (ft.) (%) (sq. mi.) (ft.) (ft.) Type M01 99 90 2589 0.35 3904 0.23 1.51 12.02 35.3 758 21.5 VB C Riffle-PoolM02 117 99 3356 0.54 5529 0.33 1.65 11.54 34.6 435 12.6 VB C Riffle-PoolM03 136 117 6286 0.3 10168 0.19 1.62 11.32 34.3 263 7.7 BD E Dune-RippleM04 161 136 4705 0.53 8041 0.31 1.71 10.98 33.7 398 11.8 VB C Riffle-PoolM05 165 161 2293 0.17 2581 0.15 1.13 10.22 32.5 449 13.8 VB C Riffle-PoolM06 178 165 5068 0.26 7404 0.18 1.46 10.03 32.2 475 14.7 VB E Dune-RippleM07 183 178 1074 0.47 1905 0.26 1.77 9.38 31.2 376 12.1 VB E Dune-RippleM08 191 183 1825 0.44 2885 0.28 1.58 8.1 29 370 12.8 VB E Dune-RippleM09 302 191 3293 3.37 4141 2.68 1.26 7.52 27.9 80 2.9 SC B Plane BedM10 315 302 7070 0.18 9689 0.13 1.37 7.29 27.5 273 9.9 BD C Riffle-PoolM11 346 315 5437 0.57 6383 0.49 1.17 5.35 23.5 508 21.6 VB C Riffle-PoolM12 407 346 1715 3.56 2106 2.9 1.23 4.59 21.8 125 5.7 NW B Plane BedM13 432 407 4825 0.52 6106 0.41 1.27 4.43 21.4 200 9.3 BD C Riffle-PoolM14 434 432 922 0.22 995 0.2 1.08 3.66 19.5 263 13.5 VB C Riffle-PoolM15 452 434 3383 0.53 4298 0.42 1.27 2.35 15.6 458 29.4 VB C Riffle-PoolM16 515 452 3251 1.94 3631 1.74 1.12 1.67 13.1 221 16.8 VB C Riffle-PoolM17 534 515 3705 0.51 3796 0.5 1.02 1.32 11.7 1086 92.8 VB C Riffle-PoolM18 564 534 990 3.03 1274 2.35 1.29 0.57 7.7 574 74.9 VB M19 787 564 3520 6.34 3603 6.19 1.02 0.19 4.4 200 45.4 VB A Step-PoolT1.01 507 184 11534 2.8 13511 2.39 1.17 1.1 10.7 266 24.9 VB B Plane Bed

Indian Brook Reservoir

Reach 1

Reach 2

Reach 3Reach 3

Landcover/Landcover/LanduseLanduseStep 4Step 4

Indian Brook Reservoir

Hmmmm?

Not anymore!

Indian Brook ParkIndian Brook Park LU 17 – Outdoor LU 17 – Outdoor

and other urban and other urban and built-up landand built-up land

SGAT classified it SGAT classified it as Urbanas Urban

Reaches 13 and 14Reaches 13 and 14 Hard to classify from Hard to classify from

the aerialsthe aerials

Reaches 16 and 17Reaches 16 and 17 Very easy to see they Very easy to see they

aren’t urbanaren’t urban

ImpoundmenImpoundmentt

Mill Pond RoadMill Pond Road

Indian Brook ReservoirIndian Brook Reservoir

StraighteningStraightening Essex Junction

RIT

Bank ArmoringBank Armoring

Steep bankSteep bank Between two Between two

culvertsculverts Behind Essex Behind Essex

High SchoolHigh SchoolReach 3

Reach 11

Broad ValleyBroad Valley Near Bike Near Bike

Path bridgePath bridge

Summary Summary ConditionsConditions

Phase 1Phase 1 Aerials Aerials LC/LU LC/LU RITRIT Age of dataAge of data

Impacted ReachesImpacted Reaches Partly impairedPartly impaired Usefulness of Phase Usefulness of Phase

I dataI data Reach 11Reach 11

Reach 2