Water Meniscus
The water meniscus is the curved surface of water in a container caused by adhesive forces. Let's apply this to a pool. The water level at the edge of the pool will be higher due to these adhesive forces, creating a meniscus.
Wind speeds will affect the amount of meniscus required. The meniscus protects the zero edge or the exotic edge from blowing dry. It’s important to set the customer expectation on how the zero edge will hold up under certain wind conditions for their project. For example, it will increase the budget to design the system to operate in 12 mph wind. under 6 mph winds: 1/8” meniscus 6-8 mph winds: 1/4” meniscus Rule of Thumb: 1/4” meniscus requires 7 gpm per linear foot 10-12 mph winds: 3/8” meniscus Rule of Thumb: 3/8” meniscus requires 13 gpm per linear foot
Notes on 2/29/24 w/ Chris Walton, Jack Spellman, Adam P, and Lee Russell
Friction Loss PVC Charts
5.94 feet per second @ 950 GPM Since it is under 6 feet per second, this means that we can use it for both the suction and discharge side of the feature Waterproofing
Does not recommend basecrete currently as they are having some bonding to itself and temperature Wait about 2 or 3 months until you get it He would recommend doing Permacoat Color of interior finish
Chris recommends Caribbean Blue Perimeter Zero Edge Material
Misc Edits to Existing Drawing
8” beam for zero edge behind trough Redo trough around spa to work with champagne spa Prestige project, show this detail - Harrington PDF, he said would send this to Jack at 2:32:00 via Pratt guys email to Jack Misc
Make the gap larger, 5/8” (On a customers pool, make it narrower) Want to know the total gallons in the top 1” and top 4” of the pool Autofill on Surge tank, bottom draw of that freeboard. Jandy LevolorK1100 electronic auto fill Always operate as approximately 6-8 ft per second for plumbing, refer to Friction Loss PVC Charts Autofill
Jandy LevolorK1100 electronic auto fill Freeboard (Drawdown)
Total Gallons of Freeboard Water in Transit and Displacement Those 2 things above are what you take into consideration to calculate freeboard To calculate Freeboard, you are taking (2) things into consideration We will need to determine what our minimum depth is and maximum depth is inside of the cistern tank in order to properly install the Jandy LevolorK1100 electronic auto fill which this will be taking the freeboard (Water in Transit and Displacement) into consideration Pumps
Titan 95 Pump, single speed (We do not need a variable speed) 300-500 GPM with approx. a 5-7hp pump Need a pump that does approx. 450 GPM each, will put us at about 900 GPM total Meniscus
Zero Edge Beam
16” thick from the waters edge Pool
Linear Ft of Perimeter (Weir Edge) 835 GPM @ 1/4” Meniscus @ 119.33’ linear ft Titan 95, single speed (We do not need a variable speed) Install 2-Way Butterfly Valves Install them on the discharge side (we can cam it down so it doesn’t operate at 100%) Chris Walton is saying this is better for the pump to actually give it a little bit of resistance Creating artificial head pressure Spa
Linear Ft of Perimeter (Weir Edge) Gallons Per Minute for Perimeter Overflow (This has nothing to do with the GPM for the therapeutic jets) Base this on the exterior perimeter, not the interior dimension 108 GPM @ 1/8” Meniscus @ 36’ linear ft 20 gallons per minute per jet Way more efficient for our clients (2) Main Drains (Maybe we use the Pul Drains) (1) For Therapy Jets (Non heated as this will not pass through the gas heater) (1) For the Heated Footwell Return (Heated as this WILL be passing through the gas heater) When the Spa is in the normal Spa/Recirc Mode Water will Pull from Spa Main Drains and Return to Heated footwell return Heating the spa from the bottom up is more efficient. Heat radiates & rises, so installing the returns in the footwell of the spa makes the most sense as this is the most efficient. 
Zero Edge