{'fraction_non_alphanumeric': 0.025044722719141325, 'fraction_numerical': 0.018783542039355994, 'mean_word_length': 5.148351648351649, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Long-term effects of urbanization on the flow rates and durations of small streams in southern California

Fifty-two U.S. Geological Survey gauges with records greater than ~20 yrs. and watersheds less than ~250 km 2 were used to empirically model the effects of urbanization on small free-flowing streams in southern California. The gauged watersheds span a gradient of urban development and ranged from 0 - 23% imperviousness in 2001. Urbanization emerged from an expansive array of geographic information system-derived hydrologic variables as a statistically significant (p 0.9) to days of occurrence versus logarithmically binned discrete discharges to represent the entire record of daily mean flows greater than some nominal value (e.g. 0.03-0.3 m 3 /s depending on watershed size). For a particular drainage area and climatic setting, urbanization results in proportionally longer durations of geomorphically effective flows. Increased duration of sediment transporting flows is a primary driver of accelerated changes in channel form that are often concurrent with urbanization throughout southern California.