Help Making Scoop functional

I have a New hoodscoop for my 75 duster and i have no idea how to go about making it functional. I have the obvious so far cut a hole and use some kind of screen but dont i need some way to keep water from the engine? How would I do this? I use this car everyday so i need a lasting effective solution I appreciate any help! Thanks You can email me at Manks_bloodstone@hotmail.com