ystem Pressure

$20$ m with $10$ bends

$(1)$ Length $=35**0\mathrm{.}25$

$=8\mathrm{.}75$kPa$2$ for return

$=17\mathrm{.}5$kPa

Bends $=18**0\mathrm{.}15$

$=2\mathrm{.}7$kPa$2$ for return

$=5\mathrm{.}4$kPa

Branches $=3**0\mathrm{.}1$

$=0\mathrm{.}3$kPa

$=0\mathrm{.}6$kPa

$=23\mathrm{.}5$kPA

Total drop in pipework

$=1$kPa

Plus drop through emitter

$=24\mathrm{.}5$kPA

Why they consider $3$ branches not $4?$