Question Statement:
Which of the following hydraulic principles and design criteria are characteristic of micro-irrigation (drip/trickle) systems?
```
Inlet Pressure H0 ───* (Max Pressure)
\ Friction Head Loss (Hazen-Williams / Scobey)
\ Allowable ΔH ≤ 20% of nominal head
`───* Pmin (Tail end)
════════════════════════════╧═══════════════ Drip Lateral with Emitters
```
Options:
- (A) Total operating pressure variation along a lateral line should generally not exceed $20\%$ of nominal operating head ($\Delta H \le 0.20 H_{nom}$)
- (B) The resulting emitter discharge variation along the lateral is maintained within $\pm 10\%$ (discharge exponent $x \approx 0.50$ for turbulent flow emitters)
- (C) Filtration units (hydrocyclone sand separators, media/gravel filters, and screen/disc filters) are essential to prevent emitter clogging
- (D) Fertilizers and systemic agrochemicals can be precisely dosed simultaneously through fertigation injectors