unrivaled stormwater mitigation systems...technical reviewer & advisor ‡ wwef (1998). ... of...
TRANSCRIPT
UNRIVALED
STORMWATER
MITIGATION
SYSTEMS
T M
STORMVAULT™ DESIGNED TO DO IT R IGHT
Communities today are fast becoming aware of the dangerous impact stormwater runoff has on our surface and
ground waters. Stormwater runoff is harmful to the downstream environment because it shocks the water supply with
higher flows and increased sediment and associated pollutant loads. To effectively protect the environment of the
receiving waters, stormwater treatment should strive to provide both pollutant removal and flow attenuation.
The innovative design of the Stormvault™ out performs traditional stormwater treatment units which demonstrate
various deficiencies in removing pollutants and slowing runoff velocities. Products built with a flow-through design
may remove trash, debris, and large sediments, but are ineffective at removing small particles. The Stormvault™ will
effectively remove those smaller particles equal to or less than 100 microns which account for the majority of the
pollutant load associated with particulate matter in urban stormwater.* The Stormvault's™ water quality capture volume
design has the unique abil ity for capturing and retaining pollutants, preventing sediment resuspension.
Stormvault™, unlike flow-through systems, has the hydraulic capacity to attenuate peak runoff flows. Increased
runoff flows resulting from urbanization cause erosion and stream channel degradation. Experts believe that these
increased flows are at least as significant a problem as the pollutants that they carry from developed areas. High flows
sand loads from frequent events have the most deleterious effects on the riparian ecosystems. Therefore, by capturing,
treating and mitigating the impacts of the most frequently occurring runoff events, the Stormvault™ offers the greatest
environmental benefit.**Stormvault™ is designed to capture up to 85% of all runoff then
slowly release it to receiving waters. This capture-and-controlled
release is specifically designed to catch small particles and minimize
their resuspension by treating that portion of runoff containing the
highest percentage of pollutants, including "the first flush" of the
larger events and to provide peak flow attenuation to reduce
downstream erosion. Stormvault™ significantly reduces post-
development runoff flow rates, stream channel degradation, and
destruction of aquatic habitats. This high quality discharge is
accomplished irrespective of influent concentration or in flow volumes.
Stormvault™ has proven capable of providing an effluent discharge
TSS concentration of less than 20 mg/L with a 95% level of confidence.
This claim is based on over 40 storm events as documented by third
party monitoring—See:
www.people.virginia.edu/~enqstorm/storm/swgproj.htm.
Please see our web site at www.stormvault.com for complete text of
our reports from Sacramento, CA and Charlottesville, VA and our
recommended sizing criteria.
BECAUSE STORMVAULT™
IS BUILT ON SOUND
ENGINEERING PRINCIPLES
AND BACKED BY EXTENSIVE
HYDRAULIC LABORATORY
AND FIELD TESTING, IT
ADDRESSES PREVIOUS
DESIGN SHORTCOMINGS.
THE RESULT: NOT ONLY A
NEW PRODUCT, BUT AN
ENTIRELY NEW APPROACH,
AND A STRUCTURAL
TREATMENT UNIT THAT
ACTUALLY WORKS!
Urbonas, B. and Stahre, P. (1993). "Stormwater:
Best Management Practices and Detention,"
Practice Hall, NJ, USA.
Schuler, T.R. (1994). "Watershed Protection
Techniques," Center for Watershed Protection,
Silver Springs, MD, USA.
*
**
STORMVAULT™
RESEARCH AND
DEVELOPMENT
team
W ith more than 35 years of leadership in developing precast
concrete products, Jensen Precast made a commitment
to manufacture and deliver a superior stormwater
treatment system.
In 1998, the company contracted with renowned consultants,
engineering f irms and universities to design the optimal vault
for present and future stormw ater mitigation.
The resulting product, Stormvault™ ,
achieves Jensen´s lofty goal. Its
unprecedented patented design
provides stormwater capture and
treatment that surpassed expectations
and is well suited for satisfying Phase II
NODES regulatory guidelines for urban
areas. W e believe Stormvault™ more
than meets its intended function as the
best structural stormw ater mitigation
system f ound on the market today.
See for yourself by calling Jensen
Precast at (800) 648-1134. W e´ll send
you the Stormvault™ design manual,
complete with research, test data and
design specif ications.
STORMVAULT™ SUPERIOR STORMWATER TREATMENT
W r i g h t W a t e r E n g i n e e r s I n c.
Jonathan E. Jones, P. E.
Andrew Earles, Ph. D.
M ark Van Nostrand, P. E.
John O´Brien
Co lo r a do St a t e U niver sit y,
Department of Civil Engineering:
Dr. Steve Abt, P. E. , Director of
Hydraulics Laboratory
Tom Brisbane
U niver sit y o f V ir g in ia ,
Department of Civil Engineering:
Shaw L. Yu, Ph.D.
Elizabeth Fassman, M . S.
U rban W atersheds:
Ben R. Urbonas, P.E., Outside
Technical Reviewer & Advisor
‡ WWEF (1998). " Urban Runoff Quality M anagement," WEF Manual of Practice No.23
ASCE Manual and Report on Engineering Practice No.87
Manker, P.W., et al, (1998). Flood Hazard News‡‡
FLO
W
TIM E
Post-development hydrograph,uncontrolled runoff with highrunoff coeff icient
Pre-developmenthydrograph, runoff withlow runoff coeff icient Post-development
hydrograph, with properlysized Stormvault™ ††
†
††
Minton, Gary (2002). " Stormwater Treatment,"Gary Minton, Seattle, WA, USA.A properly sized Stormvault™ can reduce Post-developmentrunoff flow rates to less than Pre-development values.
00
2 0
4 0
6 0
8 0
1 0 0
0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 1 8 0 2 2 02 0 0 2 4 0 2 6 0 2 8 0
ComparativeLine ofPerformance© †
Sacramento2001Stormvault™
V irginia 2001Stormvault™
V irginia 2002Stormvault™
The Jensen Precast Stormvault™ is designed to meet the intent of Phase II NPDES Maximum Extent Practicable (MEP) for discharge
to waters of the United States through the management and treatment of site runoff by diverting the design water quality capture
volume into the vault. This Water Quality Capture Volume (WQCV) sizing methodology is based upon recommendations of two
of the most prominent civil engineering professional associations: the American Society of Civil Engineers (ASCE) and the Water
Environment Federation (WEF).‡ This approach calculates the fraction of the runoff that is treated after processing each runoff
event against the Stormvault™ emptying time. For optimal performance the Stormvault™ can be sized using the maximized
WQCV, the point where increasing capture volume results in a diminishing number of storm runoff events fully captured. This
volume represents not only the point of diminishing returns to economically treat storm runoff volume; it also represents the point
at which the vast majority of pollutants have been captured. Because of its many unique features, including " volume control" and
a " vertically stacked water column" , Stormvault™ has been granted a United
States Patent # 6,350,374 with other patents pending.
As urbanization and impervious surfaces increase, the quantity of runoff events
from small storms increases; as little as 0.08 to 0.12 inch of rainfall is needed to
cause initial runoff within an urban watershed.‡‡ The majority of small storms
on undeveloped land may not produce significant runoff however, post-
development precipitation can create considerable detrimental runoff events.
The Stormvault™ system has proven capable of reducing the post-development
runoff Q to near pre-development levels and providing TSS and nutrient reductions
comparable to high quality " final treatment" natural systems as listed on the
EPA/ASCE BMP database. When compared to the Line of Comparative
Performance© created by Dr. Gary Minton, Ph.D., P.E. illustrating the median
performance data of grassy swales, wet ponds and sand filters, over 70% of
the Stormvault's™ monitoring data points were above this median
performance curve. The Stormvault™ clearly rivals the performance of these
public domain stormwater technologies by effectively removing TSS from
stormwater runoff to near irreducible levels. The Stormvault™ eliminates
traditional disadvantages of natural systems such as extensive surface area
requirements, excessive thermal pollution, attractive nuisance liabilities,
mosquitoes and long-term maintenance access and disposal concerns. The
Stormvault's™ unrivaled third party monitoring data from over 40 individual
storm events has been reviewed and accepted by the USEPA/ASCE BMP database.
Please see www.bmpdatabase.org.
STORMVAULT™ OPT IM I ZES CAPTURE AND HOLD
STORMVAULT™
PERFORMANCE AND THE
LINE OF COMPARATIVE
PERFORMANCE©
RE
MO
VA
L E
FF
ICIE
NC
Y (
%)
I N F L U E N T T S S ( m g / L )
STORMVAULT™ WITH RUNOFF CONTROL
CONTROL ORIFICE
TRAPEZOIDAL EXIT BAFFLE
EFFLUENT CONTROL TEE
LARGE OUTLET SCREEN
INLET PIPE
DIVERSION WEIR
OUTLET
SEDIMENT BAFFLE
MULTIPLE ACCESSES
ENERGY BAFFLE
STORMVAULT™ FEATURES AT A GLANCE
Stormvault™ is a USA & C anada Patent Pending System.
W ith its sizing f lexibility, Stormvaultª of fers excellent economy of
scale. Add to that Jensen Precast´s f ield supervision, delivery and
assembly services, and more than 35 years in the industry and you
will realize exceptional value and service. See for yourself by calling
Jensen Precast at (800) 648-1134.
TM
w w w. st o r mva u lt . co m
Stormvault™ is a trademark of Jensen Precast and is covered
under U.S. Patent No. 6350374 and other
U.S. and Canadian patents pending.
Copyright © 2001-2003, Jensen Precast, a ll r ights reserved.
JE N /V 4/0603
w w w .jensenpr eca st . co m
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