My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
JAWRA - Stormwater Runoff
CWCB
>
Water Conservation
>
DayForward
>
JAWRA - Stormwater Runoff
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
12/16/2009 7:50:08 AM
Creation date
12/15/2009 4:07:14 PM
Metadata
Fields
Template:
Water Conservation
Project Type
General OWC
Title
Stormwater Runoff Quality and Quantity from Traditional & Low Impact Development Watersheds
Date
12/15/2009
Water Conservation - Doc Type
Reports
Supplemental fields
Drought Mitigation - Doc Type
News Article
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
11
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
SEDAN AND CLAUSEN <br />FIGURE 2. Traditional Watershed Subdivision <br />for the Jordan Cove Project, Connecticut. <br />FEET 0 50 100 300 <br />METERS 10 50 10 <br />— - -- — -- <br />i <br />Match line see Figure 2 <br />FIGURE 3. LID Watershed Subdivision for <br />the Jordan Cove Project, Connecticut. <br />was used with reduced lawn areas, replaced by low - <br />mow and no -mow areas. Deed restrictions prevented <br />increased impervious surfaces, alteration of LID <br />structures, rain garden filling, and changes to origi- <br />nal driveway surfaces during the course of the study. <br />Education sessions, informational packets, and soil <br />testing were used to instruct homeowners on LID <br />practices, such as lawn maintenance, rain garden <br />care, and rain barrels for rainwater use. <br />Study Design <br />The paired watershed approach was used for this <br />study (Clausen and Spooner, 1993). A primary <br />strength of the paired watershed approach is that it <br />corrects for year to year differences in precipitation, <br />which can confound temporal studies. One control and <br />two treatment watersheds were monitored during cal- <br />ibration, construction, and postconstruction periods. <br />Calibration occurred prior to any applied treatment in <br />the watersheds, and regression relationships of paired <br />runoff observations were established between the con- <br />trol and the two treatment watersheds. The construc- <br />tion of houses in the traditional and LID watersheds <br />began the first treatment (construction), while the <br />second treatment (postconstruction) began immedi- <br />ately after construction was complete. <br />Periods of calibration and treatment varied by date <br />and length depending on the watershed and construc- <br />tion schedules (Table 2). The length of the calibration <br />period was determined by when construction began <br />in the watershed and when a significant calibration <br />equation existed between the paired watersheds. <br />Since construction took longer in the LID watershed, <br />the postconstruction period started later than in the <br />traditional watershed. This paper presents only the <br />data and results from the calibration and post - <br />construction periods through June 2005. <br />Monitoring <br />Discharge from the control watershed was moni- <br />tored with a combination rectangular/V -notch weir in <br />a 76 cm stormwater pipe. A precalibrated 45.7 cm <br />11-flume was used to measure overland flow during <br />the calibration period in the traditional watershed. <br />During the postconstruction period, a precalibrated <br />Palmer - Bowlus flume in a 38.1 cm stormwater pipe <br />was used to measure discharge. Overland flow in the <br />swales was monitored in the LID watershed using a <br />45.7 cm H -flume. <br />Stormwater runoff from each watershed was moni- <br />tored continuously using ISCO 4230 bubbler flow - <br />meters (Isco, Inc., Lincoln, Nebraska). Fifteen - minute <br />discharge was downloaded weekly from each ISCO <br />flowmeter using a computer. An ISCO 2900 sampler <br />(Isco, Inc.) collected flow - weighted, composite samples <br />of stormwater runoff directly in a refrigerator. Sam- <br />ples were collected in three plastic bottles. One bottle <br />was preacidified with sulfuric acid for nutrient pres- <br />ervation, a second bottle preserved metals with nitric <br />acid. The third bottle was not acidified and was used <br />for suspended solids analysis. <br />Collected samples were retrieved weekly, and <br />transported in a cooler with ice packs to the Univer- <br />sity of Connecticut, Storrs and stored at 4 °C until <br />analyzed. When discharge occurred during site visits, <br />grab samples were collected from each monitoring <br />station in sterile sampling bags for analyses of fecal <br />coliform (FC) bacteria and 5 -day biochemical oxygen <br />demand (BOD <br />JAWRA 1000 JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION <br />Match line see Figure 3 <br />
The URL can be used to link to this page
Your browser does not support the video tag.