Add new files to work with hydrologic data

Scripts calculate stream stage and hydraulic head from piezometer and ultrasonic water level sensor measurements.

Author: jzmejia

constants.py

@@ -0,0 +1,95 @@
+#!/user/bin/env python
+"""
+Constants
+---------
+    Physical
+    GRAVITY: float
+    GRAVITY_UNIT: str
+
+    ICE_DENSITY: float
+    WATER_DENSITY: float
+    DENSITY_UNIT: str
+
+    SECONDS_PER_DAY: int
+    
+    Glen's flow law parameters:
+    A
+    n
+
+Station Stats
+-------------
+    LOWCAMP: Dict
+    JEME: Dict
+    PIRA: Dict
+    RADI: Dict
+
+"""
+
+
+GRAVITY = 9.81
+GRAVITY_UNIT = 'm s^-2'
+
+# densities
+ICE_DENSITY = 917.0
+WATER_DENSITY = 1000.0
+DENSITY_UNIT = "km m^-3"
+
+
+GEOTHERMAL_FLUX = 0.06
+GEOTHERMAL_FLUX_UNIT = 'W m^-2'
+
+LATIENT_HEAT_OF_FUSION = 3.35E5
+LATIENT_HEAT_OF_FUSION_UNIT = 'J kg^-1'
+
+# time
+SECONDS_PER_DAY = 60 * 60 * 24
+
+
+LOWCAMP = {
+    'surface elevation': 765.8,
+    'ice thickness': 503,
+    'uncertainty': 100,
+}
+
+
+JEME = {
+    'year': 2017,
+    'surface elevation': 765.8,
+    'ice thickness': 503,
+    'depth to water': -201.31,
+    'zero reading': {
+        'submerged depth': 21.31,
+        'submerged depth unit': 'm',
+        'submerged depth time': '2017-07-20 21:15:00',
+        'atmospheric pressure': 9.24222,
+        'atmospheric pressure unit': 'mH2O',
+        'atmospheric pressure time': '2017-07-20 21:00:00'
+    }
+}
+
+PIRA = {
+    'year': 2018,
+    'surface elevation': 764.9,
+    'ice thickness': 503,
+    'depth to water': -143.5,
+    'pizometer depth': 11,
+    'zero reading': {
+        'logger': 1.14,
+        'logger unit': 'm'
+    }
+}
+
+
+RADI = {
+    'surface elevation': 933.2,
+    'ice thickness': 712,
+    'depth to water': -244.38,
+    'zero reading': {
+        'submerged depth': 11.820,
+        'submerged depth unit': 'm',
+        'submerged depth time': '2017-07-29 20:30:00',
+        'atmospheric pressure (P0)': 9.36666,
+        'atmospheric pressure unit': 'meters of water',
+        'atmospheric pressure time': '2017-07-29 19:59:31.2'
+    }
+}