Looks correct to me. Now, there are some differences between wiringPi’s pin numbers vs. the BCM GPIO numbers:
https://projects.drogon.net/raspberry-pi/wiringpi/pins/
on OSPi 1.3, the rain sensor is connected to the TXD pin (the 4th pin on the right column of P1), and relay is RXD pin (the 5th pin), depending on whether you are referencing wiringPi’s pin number or BCM GPIO numbers, it could be either 15 or 16.