They are used to identify the geology, geomorphology, soil, lineament density, drainage density, rainfall and landuse for maps that indicate the occurrence of groundwater (Preeja et al, 2011).
Indian Remote Sensing System Linear Imaging Self-scanning Sensor III (IRS-1D LISS III) satellite imagery (April 2006) was used to prepare the geomorphology, soil, lineament, drainage density and landuse maps.
Their drainage density
varies in the way you would expect from the complex response of precipitation to topography," said Scanlon.
The porosity of the drainage layer (p) is calculated knowing drainage density
and particle density and is expressed as a percentage by volume:
To find out the pattern of drainage density, drainage frequency and drainage texture of the study area
Parameter Formula Reference Drainage Density (Dd) Dd = [summation]L/A L Horton, 1932 = Length of the rivers; A = Area Stream Frequency (Df) Df = [summation]N/A N Horton, 1932 = Number of river segments A Drainage Texture (Dt) Dt = N[mu]/P N[mu] = Total Horton, 1945 number of stream in all segments; P = Basin perimeter
Some morphometric indexes like tension factor, waterway density, mean slope of basin drainage density, Horton shape factor, rate 1,2 and 3 of branching ratio, average of rate 2 waterway decrease factor, main waterway length and average of rate 3 waterway decrease factor are related to deposit discharge in 0.
Those acceptable variables are tension factor, drainage density, Rate 1 branching ratio and in exponential model of morphometric indexes tension factor, drainage density, height difference of the basin and Rate 2 branching ratio.
Two hydrographic factors include runoff (mm/year) based on a water balance model (Wolock and McCabe 1999), and drainage density
estimated from high resolution (HR) NHD catchments (Stanislawski et al.
A high drainage density
can increase the risk of flooding because of the significant volume of water moving from the tributaries to the main course.
They also found that "the average rise time and duration of flow decreased as drainage density
increased and as the slope of the main channel increased .
39 km per km2 (km/km2) overall drainage density
for the subbasin.