function [water_gal_month] = water_calculation(user_answers)
    
//This function takes the user's answers and calculates the monthly
//water consumption in gallons per month.

//Water - Pets
pet_water_gpw = 36*user_answers(6); //36 gal per week * # of pets

//Water - Washing machine
laundry_water_gpw = 15*user_answers(10); //15 gal per load * loads per week

//Water - Washing hands
hand_washing_water_gpw = 2.5*7*user_answers(3); 
    //2.5 gal per day * 7 days per week * # occupants

//Water - Washing dishes
dish_washing_water_gpw = 50; //50 gal per week

//Water - Cooking
cooking_water_gpw = 0.5*3*7*user_answers(3);
    //0.5 gal per meal * 3 meals per day * 7 days per week * # occupants

//Water - Cleaning
gen_cleaning_water_gpw = 3;
    //3 gal per week

//Water - Drinking
drinking_water_gpw = 1*7*user_answers(3);
    //1 gal 7 days per week * # occupants

//Water - Showers
shower_water_gpw = 20*user_answers(11)*7;
    //20 gal per shower * showers per day * 7 days per week

//Water - Baths
bath_water_gpw = 36*user_answers(13);
    //36 gal per bath * baths per week

//Water - Brushing Teeth / General Hygiene
gen_hygiene_water_gpw = 2.5*7*user_answers(3);
    //2.5 gal per day * 7 days per week * # occupants

//Water - Plants
plant_water_gpw = 1*7*1/16*user_answers(7);
    //1 cup per plant per day * 7 days per week * 1 gal per 16 cups * # plants

//Water - Miscellaneous
misc_water_gpw = 7;
    //1 gal per day misc. * 7 days per week

water_gal_month = (pet_water_gpw + laundry_water_gpw + ...
    hand_washing_water_gpw + dish_washing_water_gpw + cooking_water_gpw + ...
    gen_cleaning_water_gpw + drinking_water_gpw + shower_water_gpw + ...
    bath_water_gpw + gen_hygiene_water_gpw + plant_water_gpw + ...
    misc_water_gpw)*52/12;
    //gal per week * 52 weeks per year / 12 months per year

endfunction