def get_key(row, transform=False):
P = row['P']
land = row['land']
soil = row['soil']
if transform:
land = str(lookup_nlcd(row['land']))
new_soil_types = ['a', 'b', 'c', 'd']
old_soil_types = ['0', '1', '2', '3']
soil_types_map = dict(zip(new_soil_types, old_soil_types))
soil = soil_types_map[row['soil']]
return (P, land, soil)
def get_key(row, transform=False):
P = row['P']
land = row['land']
soil = row['soil']
if transform:
land = str(lookup_nlcd(row['land']))
new_soil_types = ['a', 'b', 'c', 'd']
old_soil_types = ['0', '1', '2', '3']
soil_types_map = dict(zip(new_soil_types, old_soil_types))
soil = soil_types_map[row['soil']]
return (P, land, soil)
def get_pollutant_load(use_type, pollutant, runoff_liters):
"""
Calculate the pollutant load over a particular land use type given an
amount of runoff generated on that area and an event mean concentration
of the pollutant. Returns the pollutant load in lbs.
"""
mg_per_kg = 1000000
lbs_per_kg = 2.205
nlcd = lookup_nlcd(use_type)
emc = lookup_load(nlcd, pollutant)
load_mg_l = emc * runoff_liters
return (load_mg_l / mg_per_kg) * lbs_per_kg
