I-25 Landscape Master Plan - Laserfiche WebLink

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D. Design Requirements: 1. Pressure a, Designed for lowest available static pres- sure during the irrigation season. b. Pressure regulating valves or pressure regulating remote control valves required: 1) if available static pressure exceeds sys- tem design pressure by more than 15 psi 2) System design pressure - all losses + sprinkler operaling pressure c. For each model 01 head used, designer in- dicates in the legend: 1) Irrigation head operating pressure 2) Irrigation head radius 3) Irrigation head spacing, and gallons per minute d. Pressure at any outlet point within the sys- tem shall not vary more than 15% Irom the designed sprinkler operating pressure. (Example: Sprinkler section designed to be operated at 30 psi must not have a varia- tion of more than 4,5 psi), e, Designer provides complete water pres- sure and eleclricalloss calculalion 2. Evapo-transpiration deticit and precipitation rate, a, System must have the capacity to apply water at a rate which satisfies the evapo- transpiration deficit b, System must have the capacity to apply 1- 1/2 inches of water within a forty hour per week period (not to exceed 8 hours per night, 5 nights per week) 3. Designerr provides a suggested tulf watering schedule. 4, Designer considers separate sectioning (zoning): a, Tulf b, Ground cover. trees and shrubs c, North and east sun exposures d, South and west sun exposures e, Sloping areas ot 3:1 or greater (top and toe separately valved) I, Special situations 1) Structure planting 2) Areas of deep shade g, Sprinkler heads should have a maximum of 15% precipitation rate variance per seC- tion 5, Designer incorporates specially valves as needed: a, Pressure reducing valves b, Pressure reliel valves c, Air relief valves d, Vacuum relief valves e, Isolation valves I, Quick couPler valves g, Drain valves h. Flush valves I. Strainer and liners 6, Reduced pressure backflow prevention units (RPBFPU) should be used: a, To isolate irrigation systems lrom potable water b, Specitications 01 installation 01 BPUs (re- quired by law) 1) Installed according to the "Manual for Cross-conneclion Control" (Foundation for Cross-conneclion Control and Hydro- lic Research USC, Los Angeles, CA 90007) or according to local require- menls. 2) BPUs should be located within shrub beds, adjacent to walls or in a concrete vault (II posilive drainage can be main- tained) 3) BPUs must be a minimum of thirty leet away from vehicular tranic 4) All risers and liUings are metal 5) May have openings or accessories on downstream side only 6) May be installed where other compo- nents of the syslem are at higher eleva- tions or where there is greater down- stream pressure than the potable sys- tem 7) Mus' be Installed a minimum 01 12 inch- es above the surrounding gr,!de to Plll- vide access lor testing and drainage 01 discharge c. Remote Control Valves 1) Drip valves should be sized to provide lor minimum llow and flushing condition 2) Size unrelated to upstream and down- stream pipe sizes; generally valve sizes will be smaller than upstream or down- stream pipe sizes 3) Pressure regulation equipped remote control valve should be considered if the required pressure downstream of the RCV is 25% less than upstream side 7. Sprinkler head location a. All heads shall be spaced a160% of diam- eter or less b. Trim border 01 Irrigation areas with sprink- lers having an arc paltern and radius that will allOid overthrow onto adjacent areas c. Use low precipitation heads (less than 1/2 inch per hour) as much as possible 8. Sleeving a, All pipe and wire under vehicular paving shall be inslalled in class 200 PVC sleev- ing b. Sleeving shall be marked at installation 1) Mark with 14 gauge minimum irrigation wire or manufactured metallic locating tape (inslall at 12 inches above the sleeve along its lull length) 2) Marker shall be capable 01 above ground location by a metal detector 3) Sleeve size should be double the pipe size 9. Vandal Prevention a. Designer determines potential for vandal- ism at the specilic site 55.