SmartSlope Irrigation Description


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A 3 page document providing details for the use of drip irrigation within an SmartSlope Living Retaining Wall System.

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SmartSlope Irrigation Description

  1. 1. Smart Slope Retaining Wall System Drip Irrigation Tubing Installation DirectiveIn order to produce a healthy living wall ecosystem, Smart Slope is specifying a drip irrigation systemfor its modular wall system. Below is a short description of the system and how it must be installedto meet Smart Slope protocol. This is not meant to be an all-inclusive document. Smart Slopeinstallers shall refer to design details, project-specific plan set, and project specifications foradditional information.Smart Slope installer shall be responsible for the installation of the drip tubing within the wallstructure. Because of the method of installation utilized for the Smart Slope modules, the drip tubingshall be installed while each course of the wall is constructed.As each course of the Smart Slope wall is set in place and has been backfilled, the installer shall laythe drip tubing in the receptor that is engineered into each Smart Slope Module. The installer mustbe careful that the tubing does not bow up or become dislodged from the receptor, as it can becomepinched when the next course of the wall is added. The installer shall not use any couplers on thedrip tubing within the wall structure. In the location where the drip irrigation header pipe is indicatedon the plan set, the wall installer shall leave an additional 12” of drip tubing stubbed out to the front orside of the wall. Each stub shall be taped off to prohibit debris from entering the tubing. Thisprocess shall repeat for every course of the wall.Because of the limitations of the drip tubing length for its effective operation, each row of the driptubing cannot exceed 600 feet. This may result in longer walls having multiple header pipes toaccount for their length. For example, a 1,200’ wall would have a PVC or PE header in the center onthe face of the wall feeding 600’ drip tubing runs in each direction. If the wall were 2,400’ in length, itwould need to be divided in half and two headers positioned on the wall face at 600’ from each end.Refer to the Smart Slope drip irrigation design details for schematic layout.In situations where the Smart Slope installer must ‘field engineer’ the quantity of drip tubing that canbe operated at one time, the flow rate for each linear foot of tubing will be 0.26 gallons per hour(based on the specified tubing that has emitters spaced every 12” and a flow rate of 0.26 GPH peremitter). Using this data, a 600 foot-long run of drip tubing would require a flow rate of 2.6 gallonsper minute. A 1,200 foot wall that is 12 courses of modules high would have a total flow rate of 62.4GPM. Installers should consult with the irrigation installer to confirm design flow rate in order toproperly group drip tubing runs so as not to exceed irrigation system flow capacities.Irrigation installer shall utilize an irrigation system master valve and flow sensor to protect propertyfrom damage due to potential irrigation system leaks. The irrigation control system used on theproject shall allow the flow rate to be monitored at any given time, and have the ability to close themaster valve when the irrigation system is not active, and also in the event that the controllerrecognizes a flow rate that is inconsistent with that which was assigned to the irrigation systemand/or specific zone. It is the responsibility of the owner’s representative and Smart Slope wallinstaller to communicate this information with the irrigation installer. At the very minimum, Smart nd 3430 2 Street, Suite 300 | Brooklyn, Maryland 21225 | Phone: (443) 874-7465 | Fax: (443) 874-7466 |
  2. 2. Slope requires a master valve and flow sensor to monitor any control valves that service the wallsystems.Winterization of drip tubing within Smart Slope wall structure shall be performed by irrigationmaintenance personnel at the close of the irrigating season, and prior to continued freezingconditions (typically late October-November). Refer to manufacturer’s instructions for properwinterization guidelines using a low pressure compressed air process typical of the irrigationindustry.During spring start up, irrigation maintenance personnel shall follow manufacturer’s guidelines andprocesses of slow recharge of drip tubing to reduce the possibility of damage to tubing, fittings, andall other irrigation system components. The first start up and winterization shall be included in thebid cost of the irrigation system. Wall installer shall be present at these events and make anynecessary repairs to the drip tubing within the wall structure.Wall installer shall warranty the materials and installation of the drip tubing for a period of one (1)year following approval of substantial (80% or greater) wall system completion. Wall installer shallbe responsible for any repairs of defective material and/or installation during this time period.Below is the information for the drip tubing that is specified by Smart Slope for use in the living wallmodule systems. Any deviation from this may void the warranty of the Smart Slope Living WallModule and could result in the compromise of the wall structure:TECHLINE® CV CONTINUOUS SELF-CLEANING, PRESSURE COMPENSATING DRIPPERLINEWITH BUILT-IN CHECK VALVEDescriptionTechline® CV is low volume dripperline with integral and evenly spaced pressure compensating,check valve drippers welded to the inside of the tubing at specified intervals. Techline CV isavailable with drippers in four discharge rates (0.26, 0.4, 0.6, and 0.9 gallons per hour [GPH]) evenlyspaced at 12”, 18”, or 24” centers. Techline CV is available in 100’, 250’, and 1,000’ coils. TechlineCV Blank Tubing is available in 100’, 250’, and 1,000’ coils.ConstructionTechline CV shall consist of 17mm, nominal sized one-half inch (½”) low-density linear polyethylenetubing with pressure compensating, continuously self-cleaning, integral drippers with internal checkvalve at a specified spacing, (12”, 18”, or 24” centers) or blank tubing without drippers. The tubingshall be brown in color and conform to an outside diameter (O.D.) of 0.66 inches and an insidediameter (I.D.) of 0.56 inches. Individual pressure compensating drippers shall be welded to theinside wall of the tubing as an integral part of the tubing assembly. These drippers shall beconstructed of a 2-piece plastic dripper housing containing a continuously self-flushing siliconediaphragm capable of flushing any dirt or debris that may enter the dripper, extending the full lengthof the dripper. The dripper shall have a built-in check valve that will hold the pressure exerted by a4½’ column of water (2 psi) to ensure that tubing will not drain water on zone shutdown, or allowoutside contaminants to enter the dripperline through reverse siphonage. The dripper shall have itswater inlet located in the center of the tubing to ensure it draws water from the center of the waterstream thereby ensuring the dripper is always drawing water from the cleanest part of the stream ofwater flowing through the tubing. The dripper shall also have a built-in physical root barrier wherebythe water shall exit the dripper from one location and shall exit the tubing from a second location.This physical barrier shall create an air gap inside the tubing. nd 3430 2 Street, Suite 300 | Brooklyn, Maryland 21225 | Phone: (443) 874-7465 | Fax: (443) 874-7466 |
  3. 3. OperationEach dripper shall have the ability to independently regulate discharge rates, with an inlet pressure offourteen point seven to seventy (14.7 - 70) pounds per square inch (psi), at a constant flow and witha manufacturer’s coefficient of variability (Cv) of 0.03 or less. Recommended operating pressureshall be between 20 - 50 psi. The dripper discharge rate shall be 0.26 gallons per hour (GPH)utilizing a combination turbulent flow/reduced pressure compensation cell mechanism and adiaphragm. The drippers shall be capable of continuously cleaning themselves while in operation.The dripperline shall be available with 12” spacing between drippers unless otherwise specified. Forsubsurface installation, Techline CV pipe depth shall be installed in the Smart Slope Living Wallmodule as indicated on the detail drawings unless otherwise specified. Maximum system pressureshall be 50 psi. Filtration shall be 120 mesh or finer. Bending radius shall be 7”.Drip tubing to be supplied by Smart Slope when modules, reinforcement and other accessories aredelivered. nd 3430 2 Street, Suite 300 | Brooklyn, Maryland 21225 | Phone: (443) 874-7465 | Fax: (443) 874-7466 |