1.Common material for residential irrigation systems?
1.住宅灌溉系统的常用材料？
2.Which organization promotes the use of water-saving landscaping practices?
2.哪个机构提倡节水型园林绿化？
3.How deep to bury residential sprinkler pipes?
3.住宅洒水管道的埋设深度是多少？
4.What is the typical pressure range (psi) for a drip irrigation system?
4.滴灌系统的平均压力范围是多少（psi）？
5.What does SWPP prevent?
5.SWPP 的作用是什么？
6.Which way do perforated drain pipe holes face?
6.穿孔排水管孔朝向哪个方向？
7.What to do with burred piping?
7.带毛刺的管道该如何处理？
8.Purpose of a backflow device?
8.防回流装置的作用是什么？
9.What is the minimum test pressure required for a hydronic system?
9.测试水力系统的最低压力要求是多少？
10.Best way to find pipe connection methods?
10.确定管道连接方法的最佳方式是什么？
