Hydroworks HydroFilter Handbuch

Hydroworks®HydroFilter

Operations & Maintenance Manual

Version 1.0

Introduction

The HydroFilter is a stormwater management device designed to both treat and

infiltrate stormwater.

Standard filters just treat stormwater contaminants (metals, TSS, oil, nutrients) but do

nothing to maintain the hydrologic cycle during urbanization. Maintenance of the

hydrologic cycle helps prevent flooding, erosion and promotes water quality by

maintaining the stream geomorphology. Maintenance of the hydrologic cycle requires

infiltration to reduce the additional stormwater volume and reduction in infiltration that

occurs with standard development.

The requirement for infiltration is complicated by the fact that urbanization increases

pollution and it would be detrimental to the environment to merely infiltrate this

polluted water. Therefore, there is a need to pretreat the water that is to be infiltrated

from urbanized areas such as roads and parking lots. HydroFilter provides the

pretreatment and infiltration (recharge) in one device.

Many site infiltration practices try to infiltrate all the water and the low point of the site

just prior to connection with the municipal storm drain system. This is not the same as

predevelopment infiltration which is dispersed all over the site. Centralized infiltration

can be problematic since the storm sewer is too deep, requiring an outlet control

device to back up water upstream to get the required infiltration volume. Centralized

infiltration can cause groundwater mounding and sealing of pores reducing infiltration

capacity.

LID practices promote more infiltration at the source. HydroFilter can be considered

an LID practice since the intention is to promote dispersed infiltration around the site

at each inlet which is a more holistic approach to maintenance of the hydrologic

cycle.

As storm water treatment structures fill up with pollutants they become less and less

effective in removing new pollution. This is especially true of any stormwater

treatment practice that includes infiltration such as HydroFilter. Therefore, it is

important that storm water treatment structures be maintained on a regular basis to

ensure that they are operating at optimum performance. The HydroFilter is no

different in this regard and this manual has been assembled to provide the

owner/operator with the necessary information to inspect and coordinate

maintenance of their HydroFilter.

Hydroworks®HydroFilter Operation

The Hydroworks HydroFilter (HF) is a LID device since it promotes the maintenance of

the hydrologic cycle. Unlike many infiltration systems however, HydroFilter was

designed for dispersed infiltration around the site, such as inlets or catch basins.

Under normal or low flows, water enters the structure through a grate or inlet. Incoming

water builds up around the filters and creates head to drive water radially into the filter

cartridges from theoutside throughto the center of the cartridge. There is a 6” (150mm)

diameter open center that runs through the center of each cartridge. Water reaching

the center opening falls by gravity into the base plug and is conveyed out of the

structure by a pipe(s) into the surrounding ground to be exfiltrated (Figure 1). A solid

cone with a check valve is placed on top of the top filter cartridge to prevent incoming

water from entering the 6” (150 mm) diameter opening while still allowing air to escape

from the center of the cartridges as water enters the filter.

Figure 1. Hydroworks HydroFilter Operation –Low Flow

The exfiltration pipes can be surrounded by crushed stone to increase the volume of

water to be exfiltrated back into the ground.

If the flow rate into the structure exceeds the flow capacity of the filter cartridges or

infiltration storage capacity around the infiltration pipes water will overflow into the

downstream storm drain.

It should be noted that the HydroFilter can come in many configurations (round or

square or rectangular structures) with one or two or more cartridges in a stack and

one or more stacks per structure. Therefore, the configuration of the HydroFilter

varies depending of the flow rate to be treated and volume of water to be infiltrated.

Figure 2. Hydroworks HydroFilter Operation –Bypass

Inspection

Procedure

The HydroFilter should be inspected 24 hours after rainfall. Inspection within 6 hours

of rainfall may not provide useful information regarding maintenance since the unit

may be draining down.

If the structure has not drained down to the base (bottom of lowest filter cartridge)

within 24 hours of the last rainfall, the HydroFilter likely requires maintenance.

In the event of standing water in the structure around the cartridges the cone should

be removed from a stack of cartridges. If standing water is visible in the central core

of the filter stack consistent with the level of water on the outside of the filter stack this

is indicative of a high ground water or slow infiltration and not required filter

maintenance.

However, if the water level in the central cartridge is below the bottom of the lowest

filter cartridge with standing water around the filter cartridges then filter maintenance

is required.

Frequency

Construction Period

The filter cartridges should not be installed in the HydroFilter during the construction

period since construction sediment will prematurely plug the cartridges requiring

excessive maintenance during the construction period. A plate is installed in the base

for the construction period to remind the contractor that the cartridges should only be

installed for post construction operation. This plate needs to be removed when the

cartridges are installed for post development operation.

Post-Construction Period

The Hydroworks HydroFilter should be inspected twice during the first year of

operation for normal stabilized sites (no exposed soil or materials storage). The initial

inspections will indicate the required future frequency of inspection and maintenance

if the unit was maintained and put into service (filters installed) after the construction

period.

It is anticipated that the filter cartridges will need to be replaced annually. However,

this will depend on pollutant loadings on the site and off-site activities (nearby

construction, etc.). Filters are different from separators in that sediment levels at the

bottom of a filter do not dictate maintenance frequency.

A filter does not need to be maintained until it’s rated treatment rate decreases to the

point where it can no longer provide the required annual percentage of pollutant

removal. This is a hydraulic requirement that will depend on the hydrology (rainfall

intensity distribution) and characteristics of the site (imperviousness, area, pollutant

loading) being designed. That is why the frequency of cleaning is based on the

presence of water after a storm since the flow rate is reduced indicating maintenance

is required.

Reporting

Reports should be prepared as part of each inspection and include the following

information:

1. Date of inspection

2. GPS coordinates of Hydroworks unit

3. Time since last rainfall

4. Date of last inspection

5. Installation deficiencies (missing parts, incorrect installation of parts)

6. Structural deficiencies (concrete cracks, broken parts)

7. Operational deficiencies (leaks, blockages)

8. Presence of oil sheen or depth of oil layer

9. Estimate of depth/volume of floatables (trash, leaves) captured

10. Sediment depth measured

11. Recommendations for any repairs and/or maintenance for the unit

12. Estimation of time before maintenance is required if not required at time of

inspection

A sample inspection checklist is provided at the end of this manual.

Maintenance

Procedure

1. Water/Sediment Removal

Maintenance involves removing the water and replacing the filter cartridges. In both

cases, sediment that has been collected around the filter cartridges in the sump of the

device must be removed. This is typically done by vacuum truck.

It is important to remove all sediment and water from the structure before trying

to remove and replace the filter cartridges.

2. Filter Cartridge Replacement

Replacement of filter cartridges is made easy due to the modular nature of each

cartridge. The cartridges are stacked vertically on top of each other. Each cartridge

has a bell and spigot such that the fit together.

A lifting bar is located In the center of the 6” hollow center of each cartridge near the

top of the cartridge. The top cone has a lifting ring on the top of it. Vertical stacks of

filters should have an access opening in the structure directly above them or close to

being directly above them.

A winch with a hook is lowered down to hook on to the cone lifting ring and the cone

is winched out of the structure. Similarly, the winch is hooked under the lifting bar of

each successive filter cartridge and they are winched out of the structure.

Fresh cartridges are similarly winched in stacking them as required ending each stack

with a cone. Call Hydroworks at 888-290-7900 since we offer a cartridge exchange

program.

The local municipality should be consulted for the allowable disposal options for both

the water and sediments that are removed from the HydroFilter.

Filter Cartridge Replenishment

Small HydroFilter units may be able to be replenished to extend the frequency of

replacement. Once the top cone is removed an inflatable pipe plug can be lowered

through the central core created by the connected filters to the base and expanded at

the bottom to seal the vertical core.

This vertical core or pipe can then be filled with clean water to backflush the filter

forcing it to flow from the central core opening back through the filter to the outside of

each filter cartridge. This backflush water can then be pumped or vacuumed from the

structure with the central core still being full of water.

HYDROFILTER INSPECTION SHEET

Date

Date of Last Inspection

Site

City

State

Owner

GPS Coordinates

Date of last rainfall

Depth of rainfall (last 24h)

Site Characteristics Yes No

Soil erosion evident

Exposed material storage on site

Large exposure to leaf litter (lots of trees)

High traffic (vehicle) area

HydroFilter Yes No

Standing water (above 12” base) *

Missing internal components **

Internal component damage (cracked, broken, loose pieces) **

Floating debris in the structure (oil, leaves, trash)

Concrete cracks/deficiencies ***

Exposed rebar **

* Maintenance required

** Repairs required

*** Further investigation is required

Other Comments:

Please call Hydroworks at 888-290-7900 or email us at support@hydroworks.com if you have

any questions regarding the Inspection Checklist. Please fax a copy of the completed checklist

to Hydroworks at 888-783-7271 for our records.

Hydroworks®HydroFilter

One Year Limited Warranty

Hydroworks, LLC warrants, to the purchaser and subsequent owner(s) during the warranty period subject to the terms

and conditions hereof, the Hydroworks HydroFilter to be free from defects in material and workmanship under normal

use and service, when properly installed, used, inspected and maintained in accordance with Hydroworks written

instructions, for the period of the warranty. The standard warranty period is 1 year.

The warranty period begins once the filter has been manufactured and is available for delivery. Any components

determined to be defective, either by failure or by inspection, in material and workmanship will be repaired, replaced or

remanufactured at Hydroworks’ option provided, however, that by doing so Hydroworks, LLC will not be obligated to

replace an entire insert or concrete section, or the complete unit. This warranty does not cover shipping charges,

damages, labor, any costs incurred to obtain access to the unit, any costs to repair/replace any surface treatment/cover

after repair/replacement, or other charges that may occur due to product failure, repair or replacement.

This warranty does not apply to any material that has been disassembled or modified without prior approval of

Hydroworks, LLC, that has been subjected to misuse, misapplication, neglect, alteration, accident or act of God, or that

has not been installed, inspected, operated or maintained in accordance with Hydroworks, LLC instructions and is in lieu

of all other warranties expressed or implied. Hydroworks, LLC does not authorize any representative or other person to

expand or otherwise modify this limited warranty.

The owner shall provide Hydroworks, LLC with written notice of any alleged defect in material or workmanship including

a detailed description of the alleged defect upon discovery of the defect. Hydroworks, LLC should be contacted at 257

Cox St., Roselle, NJ 07203 or any other address as supplied by Hydroworks, LLC. (888-290-7900).

This limited warranty is exclusive. There are no other warranties, express or implied, or merchantability or fitness for a

particular purpose and none shall be created whether under the uniform commercial code, custom or usage in the

industry or the course of dealings between the parties. Hydroworks, LLC will replace any goods that are defective under

this warranty as the sole and exclusive remedy for breach of this warranty.

Subject to the foregoing, all conditions, warranties, terms, undertakings or liabilities (including liability as to negligence),

expressed or implied, and howsoever arising, as to the condition, suitability, fitness, safety, or title to the Hydroworks

HydroFilter are hereby negated and excluded and Hydroworks, LLC gives and makes no such representation, warranty

or undertaking except as expressly set forth herein. Under no circumstances shall Hydroworks, LLC be liable to the

Purchaser or to any third party for product liability claims; claims arising from the design, shipment, or installation of the

HydroFilter, or the cost of other goods or services related to the purchase and installation of the HydroFilter. For this

Limited Warranty to apply, the HydroFilter must be installed in accordance with all site conditions required by state and

local codes; all other applicable laws; and Hydroworks’ written installation instructions.

Hydroworks, LLC expressly disclaims liability for special, consequential or incidental damages (even if it has been

advised of the possibility of the same) or breach of expressed or implied warranty. Hydroworks, LLC shall not be liable

for penalties or liquidated damages, including loss of production and profits; labor and materials; overhead costs; or

other loss or expense incurred by the purchaser or any third party. Specifically excluded from limited warranty coverage

are damages to the HydroFilter arising from ordinary wear and tear; alteration, accident, misuse, abuse or neglect;

improper maintenance, failure of the product due to improper installation of the concrete sections or improper sizing; or

any other event not caused by Hydroworks, LLC. This limited warranty represents Hydroworks’ sole liability to the

purchaser for claims related to the HydroFilter, whether the claim is based upon contract, tort, or other legal basis.

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