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Introduction

Regional hydraulic dimension relationships have been produced in great numbers since the first development of the approach by Dunne and Leopold (1978). Although these regional relatiionships are in wide use, the author is not aware of a comprehensive compilation of regional hydraulic dimension relationship studies into a single database that exists as open source. The RegionalCurve package seeks to fill that gap by: * Compiling regional hydraulic relationships into a single database. * Providing assessor functions to streamline application of these relationships in other studies.

The Power Function

Early in the development of these relationships it was discovered that dimensions such as bankfull width, mean bankfull depth, bankfull cross sectional area, and discharge ploted against drainage area were log-linear. Therefore monomial relationships of the form \(y=ax^m\), known as power functions (with the exponent (\(m\)) and constant (\(a\)) term corresponding to the slope and intercept of the line (\(y = mx + b\)), which appear as straight lines in a log–log graph, were adopted to simplify the representation of these relationships. This standardization of the functional form of these relationships allowed the approach to become widely adopted and conducive to compliation into a single database. Recording only two coefficients (i.e., slope and intercept) of the power function allows the relationship to be used to estimate hydraulic dimensions for any arbitrary drainage area (within the range of the original study).

Regional Analyses Contained in this Database

Figure 1 lists the regional hydraulic dimension relationship studies included in this package. It lists the dimensions calculated for each regional analysis.

#> `summarise()` has grouped output by 'region_name'. You can override using the
#> `.groups` argument.
Region Reference Width Depth Area Discharge
Altlantic Plain Bieger et al (2015) TRUE TRUE TRUE NA
Appalachain Highlands Bieger et al (2015) TRUE TRUE TRUE NA
Central and Southern AZ Moody et al (2003) TRUE TRUE TRUE TRUE
Eastern - Appalachian Plateau, New England, Valley and Ridge Johnson & Fecko (2008) TRUE NA NA NA
Eastern - Coastal Plain Johnson & Fecko (2008) TRUE NA NA NA
Eastern - Piedmont Johnson & Fecko (2008) TRUE NA NA NA
Eastern AZ/NM Moody et al (2003) TRUE TRUE TRUE TRUE
Eastern Highlands Faustini et al (2009) TRUE NA NA NA
Eastern United States Dunne & Leopold (1978) TRUE TRUE TRUE NA
IL River LTE 120 Haring (2019) TRUE TRUE TRUE TRUE
IL River LTE 300 Haring (2019) TRUE TRUE TRUE TRUE
IL River Panther Creek Haring (2019) TRUE TRUE TRUE TRUE
Illinois River Haring (2019) TRUE TRUE TRUE TRUE
IN Central Till Plain Robinson (2013) TRUE TRUE TRUE NA
IN Northern Moraine and Lake Robinson (2013) TRUE TRUE TRUE NA
IN Southern Hills and Lowlands Robinson (2013) TRUE TRUE TRUE NA
Interior Highlands Bieger et al (2015) TRUE TRUE TRUE NA
Interior Plains Bieger et al (2015) TRUE TRUE TRUE NA
Intermontane Plateau Bieger et al (2015) TRUE TRUE TRUE NA
KY Bluegrass Parola et al (2007) TRUE TRUE TRUE TRUE
Laurentian Upland Bieger et al (2015) TRUE TRUE TRUE NA
Lower Southern Driftless Haring (2019) TRUE TRUE TRUE TRUE
MA Bent & Waite (2013) TRUE TRUE TRUE TRUE
MD Allegheny Plateau/Valley and Ridge McCandless (2003a) TRUE TRUE TRUE TRUE
MD Eastern Coastal Plain McCandless (2003b) TRUE TRUE TRUE TRUE
MD Piedmont McCandless & Everett (2002) TRUE TRUE TRUE TRUE
MD Western Coastal Plain McCandless (2003b) TRUE TRUE TRUE TRUE
ME Coastal and Central Dudley (2004) TRUE TRUE TRUE TRUE
MI Southern Lower Ecoregion Rachol & Boley-Morse (2009) TRUE TRUE TRUE TRUE
Mid-Atlantic Faustini et al (2009) TRUE NA NA NA
Minnesota Eastern MN DNR TRUE TRUE TRUE NA
Minnesota Western MN DNR TRUE TRUE TRUE NA
NC Coastal Plain Sweet & Geratz (2003) TRUE TRUE TRUE TRUE
NC Mountains Harman et al. (1999) TRUE TRUE TRUE TRUE
NC Piedmont Rural Harman et al. (1999) TRUE TRUE TRUE TRUE
NC Piedmont Urban Doll et al. (2002) TRUE TRUE TRUE TRUE
New England Faustini et al (2009) TRUE NA NA NA
NH Csiiki (2013) TRUE TRUE TRUE TRUE
Northeast - Appalachian Plateau, Coastal Plain, New England, Piedmont, Valley and Ridge Bent (2006) TRUE TRUE TRUE TRUE
Northeast - Appalachian Plateau, New England, Piedmont, Valley and Ridge Bent & Waite (2013) TRUE TRUE TRUE TRUE
Northern Appalachians Faustini et al (2009) TRUE NA NA NA
NY Hydrologic Region 1/2 Mulvihill et al. (2007) TRUE TRUE TRUE TRUE
NY Hydrologic Region 3 Mulvihill & Baldigo (2007) TRUE TRUE TRUE TRUE
NY Hydrologic Region 4/4a Miller & Davis (2003) TRUE TRUE TRUE TRUE
NY Hydrologic Region 5 Westergard et al. (2005) TRUE TRUE TRUE TRUE
NY Hydrologic Region 6 Mulvihill et al. (2005) TRUE TRUE TRUE TRUE
NY Hydrologic Region 7 Mulvihill et al. (2006) TRUE TRUE TRUE TRUE
OH Region A Sherwood & Huitger (2005) TRUE TRUE TRUE TRUE
OH Region B Sherwood & Huitger (2005) TRUE TRUE TRUE TRUE
ON Southern Annable (1996a, b) TRUE TRUE TRUE TRUE
PA Carbonate Areas Chaplin (2005) TRUE TRUE TRUE TRUE
PA Non-Carbonate Areas Chaplin (2005) TRUE TRUE TRUE TRUE
PA Piedmont 1 White (2001) TRUE TRUE TRUE TRUE
PA Piedmont 2 Cinotto (2003) TRUE TRUE TRUE TRUE
Pacific Maritime Mountain Castro & Jackson (2001) TRUE TRUE TRUE TRUE
Pacific Mountain System Bieger et al (2015) TRUE TRUE TRUE NA
Pacific Northwest Castro & Jackson (2001) TRUE TRUE TRUE TRUE
Rocky Mountain System Bieger et al (2015) TRUE TRUE TRUE NA
San Francisco Bay Dunne & Leopold (1978) TRUE TRUE TRUE NA
Southern Appalachians Faustini et al (2009) TRUE NA NA NA
Southern Driftless Haring (2019) TRUE TRUE TRUE TRUE
Upper Green River Dunne & Leopold (1978) TRUE TRUE TRUE NA
Upper Salmon River Dunne & Leopold (1978) TRUE TRUE TRUE NA
USA Bieger et al (2015) TRUE TRUE TRUE NA
VA Piedmont Lotspeich (2009) TRUE TRUE TRUE TRUE
VA, MD Coastal Plain Kristolic & Chaplin (2007) TRUE TRUE TRUE TRUE
VA, MD, WV Valley and Ridge Keaton et al (2005) TRUE TRUE TRUE TRUE
VT Jaquith & Kline (2001) TRUE TRUE TRUE TRUE
West Interior Basin and Range Castro & Jackson (2001) TRUE TRUE TRUE TRUE
Western Cordillera Castro & Jackson (2001) TRUE TRUE TRUE TRUE
WV Appalachian Plateau Messinger (2009) TRUE TRUE TRUE TRUE
WV Eastern Valley and Ridge Messinger &Wiley (2004) TRUE TRUE TRUE NA
WV Western Appalachian Plateau Messinger &Wiley (2004) TRUE TRUE TRUE NA

Calculating Hyrdaulic Dimensions

To easily use the data in this database several assessor functions were created to calculate an estimate of a specified hydraulic dimension for any given drainage area. The RHG (Regional Hydraulic Geometry) function computes the hydraulic geometry dimension (cross sectional area, width, depth, discharge) from a built-in data frame of regional hydraulic equation coefficients (regional_curve).

# Calculate the discharge for a 200 sq mi watershed in Massachusetts.
RHG(region = "MA", drainageArea = 200,   dimensionType = "width")
#> [1] 127.7779

The units of the value returned from the RHG function will depend on the requested dimension (see the RHG function help for details). In this case, the requested dimension was width, so the units will be in feet.

To determine which regions are available, the regional_curve data frame can be queried.

# Determine the available regions
levels(regional_curve$region_name)
#>  [1] "Altlantic Plain"                                                                        
#>  [2] "Appalachain Highlands"                                                                  
#>  [3] "Central and Southern AZ"                                                                
#>  [4] "Eastern - Appalachian Plateau, New England, Valley and Ridge"                           
#>  [5] "Eastern - Coastal Plain"                                                                
#>  [6] "Eastern - Piedmont"                                                                     
#>  [7] "Eastern AZ/NM"                                                                          
#>  [8] "Eastern Highlands"                                                                      
#>  [9] "Eastern United States"                                                                  
#> [10] "IL River LTE 120"                                                                       
#> [11] "IL River LTE 300"                                                                       
#> [12] "IL River Panther Creek"                                                                 
#> [13] "Illinois River"                                                                         
#> [14] "IN Central Till Plain"                                                                  
#> [15] "IN Northern Moraine and Lake"                                                           
#> [16] "IN Southern Hills and Lowlands"                                                         
#> [17] "Interior Highlands"                                                                     
#> [18] "Interior Plains"                                                                        
#> [19] "Intermontane Plateau"                                                                   
#> [20] "KY Bluegrass"                                                                           
#> [21] "Laurentian Upland"                                                                      
#> [22] "Lower Southern Driftless"                                                               
#> [23] "MA"                                                                                     
#> [24] "MD Allegheny Plateau/Valley and Ridge"                                                  
#> [25] "MD Eastern Coastal Plain"                                                               
#> [26] "MD Piedmont"                                                                            
#> [27] "MD Western Coastal Plain"                                                               
#> [28] "ME Coastal and Central"                                                                 
#> [29] "MI Southern Lower Ecoregion"                                                            
#> [30] "Mid-Atlantic"                                                                           
#> [31] "Minnesota Eastern"                                                                      
#> [32] "Minnesota Western"                                                                      
#> [33] "NC Coastal Plain"                                                                       
#> [34] "NC Mountains"                                                                           
#> [35] "NC Piedmont Rural"                                                                      
#> [36] "NC Piedmont Urban"                                                                      
#> [37] "New England"                                                                            
#> [38] "NH"                                                                                     
#> [39] "Northeast - Appalachian Plateau, Coastal Plain, New England, Piedmont, Valley and Ridge"
#> [40] "Northeast - Appalachian Plateau, New England, Piedmont, Valley and Ridge"               
#> [41] "Northern Appalachians"                                                                  
#> [42] "NY Hydrologic Region 1/2"                                                               
#> [43] "NY Hydrologic Region 3"                                                                 
#> [44] "NY Hydrologic Region 4/4a"                                                              
#> [45] "NY Hydrologic Region 5"                                                                 
#> [46] "NY Hydrologic Region 6"                                                                 
#> [47] "NY Hydrologic Region 7"                                                                 
#> [48] "OH Region A"                                                                            
#> [49] "OH Region B"                                                                            
#> [50] "ON Southern"                                                                            
#> [51] "PA Carbonate Areas"                                                                     
#> [52] "PA Non-Carbonate Areas"                                                                 
#> [53] "PA Piedmont 1"                                                                          
#> [54] "PA Piedmont 2"                                                                          
#> [55] "Pacific Maritime Mountain"                                                              
#> [56] "Pacific Mountain System"                                                                
#> [57] "Pacific Northwest"                                                                      
#> [58] "Rocky Mountain System"                                                                  
#> [59] "San Francisco Bay"                                                                      
#> [60] "Southern Appalachians"                                                                  
#> [61] "Southern Driftless"                                                                     
#> [62] "Upper Green River"                                                                      
#> [63] "Upper Salmon River"                                                                     
#> [64] "USA"                                                                                    
#> [65] "VA Piedmont"                                                                            
#> [66] "VA, MD Coastal Plain"                                                                   
#> [67] "VA, MD, WV Valley and Ridge"                                                            
#> [68] "VT"                                                                                     
#> [69] "West Interior Basin and Range"                                                          
#> [70] "Western Cordillera"                                                                     
#> [71] "WV Appalachian Plateau"                                                                 
#> [72] "WV Eastern Valley and Ridge"                                                            
#> [73] "WV Western Appalachian Plateau"

This list of regions can be used to determine which regions are contained in the database and the input region string value to use for the RHG function.

Once you have determined which region to use, you will need to determine which dimensions that study derived a relationship for. Not all studies derive relationships for all hydraulic dimensions.

# Determine which dimensions were calculated for the Eastern United States region
regional_curve[regional_curve$region_name == "Eastern United States", c("dimension")]
#> [1] area  width depth
#> Levels: area depth discharge width

As you can see, only area, width, and depth are available. Discharge was not derived by this study.