Go to your other post for the answer.

Hi Marti, this is the info that came with some of our hoses. The manufacturer recommends spacing between soaker hoses based on soil type. On sandy soils the hose should be 1 to 1.5 feet apart. On loam soils, hose spacing should be 1.5 to 2 feet apart. And on clay soils spacing should be 2 to 3 feet apart. If you have a heavy soil, which is hard to dig, then use the 2 to 3 feet spacing as you wind or spiral the hosing in and around the plants to be watered. The manufacturer also indicates that the hose should be operated at low pressure and flow  10 to 30 pounds per square inch (PSI). However, this requires the addition of a pressure regulator at the supply end of the hose. Rather than attaching a pressure regulator, I suggest just barely opening the hose bib to obtain the smallest amount of water flow through the hose. Although not scientific, my tests have indicated that by just opening the hose bib slightly, the flow rate of water out the hose is about .6 gallons per foot-of-hose per hour. So, a 50 foot soaker hose would apply about 30 gallons of water per hour. Comparing this to the output of one gallon drip emitters on standard 3-foot spacings, the soaker hose applies double the amount of water over the same given time. The time needed to water with a soaker hose will depend in great part on the type of plants being watered. Trees require the longest soaking since their roots can extend down 3 feet. Small garden plants and ground covers need the shortest soaking since their roots extend down only 12 to 18 inches. The object is to allow the water to penetrate down to the rooting depth. When laying out the hose over the area to be watered, remember to watch spacing. When watering trees, start the soaker hose a few feet from the trunk. Spiral the hose out several feet beyond the edge of the branches. This will allow watering of a substantial portion of the roots. When watering shrub or ground cover beds, snake the hose through the area, extending the hose just a foot or so beyond the outermost branches. Turn the hose on and allow the water to run 30 to 60 minutes, then check the depth of wetting. You can do this by using a metal soil probe. A 3-foot piece of metal re-bar or a thick wooden dowel will work. The rod can be pushed through moist soil, but stops when dry soil is encountered. Measure the depth of wetting and adjust the watering time of the soaker hose accordingly. It may take several hours to properly water a tree. A final suggestion. Rather than run your soaker hose for a continuous time period, try running it in cycles  one hour on and one hour off until the desired depth of wetting is reached. This will further slow the rate of application and increase absorption.

As tech biker said, there should have been mounds along the trenches, not low spots. NEVER use that contractor again and if anyone asks, advise them to stay away from those guys. Buy some topsoil now to fix it. It should be mounded up about 1/2 inch to allow for future settling. You might have to taper in to normal watering. They probably told you to water every day for a few minutes. Forget that. That is another reason to not use them again. Here's more on watering. Watering: Deep and infrequent is the mantra for watering. This is for all turf grass all over the place. Deep means 1 inch all at one time. Put some cat food or tuna cans around the yard, and time how long it takes your sprinkler(s) to fill all the cans. Memorize that time. That will be the time you water from now on. My hose, sprinkler and water pressure takes 8 full hours to fill the cans. Your time will likely be less. I like gentle watering. As for watering frequency, that depends on the daytime air temperature. With temps in the 90s, deep water once per week. With temps in the 80s, deep water once every 2 weeks. With temps in the 70s, deep water once every 3 weeks. With temps below 70, deep water once a month. Note that you have to keep up with quickly changing temps in the spring and fall. This deep and infrequent schedule works in Phoenix and in Vermont, so it should work for you. The reason for deep and infrequent is to grow deeper, more drought resistant roots and to allow the soil to dry completely at the surface for several days before watering again. If it rains, reset your calendar to account for the rainfall.

Without knowing what was in the builder's mind, as the spigot is an odd contraption, the pipe could be that large for any number of reasons, one of which being because it was the default, on-hand material. If the spigot itself is functional, you only need to go to Home Depot, get about 30 odd possible connecting parts, and after getting home figure out which 5 or 6 of them will actually work to connect it to the pipe. Still a part or two short? Return to Home Depot and get a dozen more connectors which will most likely contain the actual parts needed. Possibly, there could be a third trip involved so hopefully you will not be starting this project too late in the day.