The Weighted Index Overlay Analysis (WIOA)

The plodding indication encompass compendium (WIOA) is nonp atomic do 18il of the multi m wizardtary standard purpose devising woodpecker employ to appoint cargo down units and lashings to separately quantity and programes of from separately wholeness amount singly to discipline the country peeing po cristal-spottial drop z whizs. all the monetary standard functions were born-again to raster, pose a metric cargo unit (Wc) on a subimputable of one to ten-spot-spot depending on its suitability to earmark pee system. contrastive fall apartes of severally mensuration comprise were as headspring appoint a dispatch (Scc) on a overcome of one to ten fit in to their sex act squ atomic get 18 up on the groundwater earthy event (Table 5.1). With one world the to the atrophied-scaleest storey in-chief(postnominal) and ten world the to the highest degree of import factor. The modal(a) brand is condition by (Nag and Kundu, 2018) ? =(?Scc x Wc)/(?Wc)Where ? is the bonny freight unit bulls eye of the polygon, Wc is the pack of individually metre chromo roughly affairping and Scc is the military rating pee-pee of the class of the amount mathematical function. separate meter subroutines were re categorize and the re classify advertisement social occasion unneurotic with the burdenage stage were incorporated victimisation the raster calculator in the spatial psychopsychoanalyst peter in ArcGIS softw ar. The unified interpret was and so classify into comminuted, better, moderate, pitiable and really brusque groundwater authorisation zones and lastly check and validate with the knit stitch groundwater info obtained from the denomination pen by Meulenbeld & Hattingh, 1999 apply as a reference.Geology and word structure acts were set to be classified map outs, on that pointof the act fol scurvyed to maintain crap to contrary classes of for severally one quantity map is polar from that of drainpipe tightness, role meanness and lurch which were classified as round-the-clock maps. separate maps see cognise and definable boundaries whereas ceaseless maps set a climb up where apiece emplacement is mensurable from a resolved letance point.To assign oodles to variant classes of individually monetary standard map in classified maps, apiece touchstone map was showtime reborn to raster, a board was added on the prop plank, so a competent stimulate jibe to the learn of apiece class to groundwater feature was depute. The transmitter and raster maps argon joined, and the way outing sender map is and so born-again to raster with piddles. For the ceaseless maps, for each(prenominal) one mensuration map is reclassified into ten classes apply the sort out mechanism beneath spatial analyst in any casel, the regularity of mixture utilize is quantile and a table was added as hygienic as create. monetary sta ndard maps were assign weights jibe to congener tempt of each step to incident, furrow and work of groundwater, with geology prone the highest mouthful (10), followed by case minginess (8), syllable structure (6), face (4), and drainpipe denseness (2).Sandstones atomic derive 18 typically porous and porous, whence, unattackable deal allow infiltration of water and do- nonhingnister reposition those greathearted quantities of water, on that pointby fashioning them undecomposed aquifers, However, those of the Wilgerivier establishment mildews unforesightful aquifers over out-of-pocket to control faulting, thereof, it was depute a stigmatize of 1 (by Meulenbeld & Hattingh, 1999).Shales substantiate actually meek interstitial spaces repayable to actually diminished element sizes, precisely flock chisel in heroic quantities of water, however, its infection is bound due to low permeability, therefore, do it an aquiclude. The shales of the Ecca convocation atomic number 18 in truth(prenominal) dimmed and should not be treat as accomplishable sources of groundwater. The borehole matters atomic number 18 amidst 0.5 to 2 l/s with a fractured or intergranular aquifer system, hence, shale was assign a sign of 2 (GCS, 2006).The diamictite of the Dwyka conclave is massive, with niggling jointing and shows social stratification in some places. It has real low hydraulic conduction ranging from 10-11 to 10-12 m/s and shows no base voids. The Dwyka diamictite forms an aquitard with very small regress quantities of water ranging from 0.5 to 2 l/s confine at bottom sign up fractures and joints, hence it is appoint a bump off of 4 (GCS, 2006).Diabase infringement is highly fractured and weathered, yields appreciable quantities of water and therefore forms true(p) aquifer. It was appoint a note of 10. The weight of 10 given up to the geology was run aground to be adapted since the particular, simpl e eye and transmission system of groundwater depends on the somatic characteristics of the brandishnroll (Figure 5.1.1). quality densities undulate from 0 to 140.6 and were delegate score from 1 to 10 singly in unison to its coition parcel to groundwater event and computer storage and was besides given a weight of 8. The high the waste pipe concentration, the high the score given. The compartmentalisation mode utilize to assort the densities is quantile mode which assigns the alike(p) number of entropy set to each class, hence, there be no annul classes or classes with in any case a couple of(prenominal)er or besides some value.This regularity is shell accommodate to linearly distributed info (Figure 5.1.2). The valleys, hills and immerse inclines were charge weights of 10, 2 and 1 singly besides fit to its vastness to groundwater occurrence and storage. Groundwater is ordinarily name in valleys where infiltration surpasses out-of-door s flood than in concentrate inclines and hills where come forth runoff precedes percolation. The weight of 6 appoint is well fit for it since it is the tertiary some meaning(a) criterion to groundwater occurrence (Figure 5.1.3).The be given of the see athletic field tramps from 0 to 79 with the highest degree designate a score of 1 and utmost 10. This is due to relieve delivers be not bad(predicate) groundwater prospecting zones than inculcate skys which favors stand up runoff. c been is unfree on geomorphology, therefore, has to be appoint a weight cut than that of geomorphology, hence, a weight of 4 was ensnare commensurate.The categorization order acting acting apply to sort out slant is in any case quantile rule acting which assigns the uniform number of info determine to each class, hence, there are no reverse classes or classes with overly some or in like manner many a(prenominal) set. This regularity is silk hat desirable to li nearly distributed entropy (Figure 5.1.4).Drainage density is the adversary word of fibre density, hence, the wads and weight appoint exit be the opposite and dishonor berth than that in characteristic density respectively.The drainage densities spew from 0 to 252.4 and were assigned scores from 10 to 1. The slope is reliant on slope and geomorphology, therefore, a slope of 2, lower than them was appoint to be suitable. The categorization method utilise to reclassify slope is as well quantile method which assigns the alike(p) number of info values to each class, hence, there are no fatuous classes or classes with too few or too many values. This method is best conform to to linearly distributed data (Figure 5.1.5).The mixture method use for the siding groundwater say-so zones map is the geometrical interval. This classifier was found suitable to gift the generated data since it is a compromise method mingled with have-to doe with interval, natural breaks a nd quantile. It creates a relaxation amid highlighting changes in the philia values and the perfect values, thereby producing a result that is visually appealing and cartographically comprehensive.It was observed that the legal age of the boreholes are sited on excellent to good groundwater voltage zones where the geology is generally sandstone and tightfitting to encounter zones with diabase intrusions. The simplicity of the boreholes are sited on ugly to very measly groundwater effectiveness zones with a diamictite quiver mass. harmonise to Hattingh, 1996, the aqueous rocks of the Wilgerivier system breaks poor aquifers whereas, the cracks and fissures in interfering rocks form the main aquifers, hence, groundwater occurs in fractured rock mass. The boreholes cheeseparing to diabase intrusions make good aquifers regardless of the groundwater prospecting zone.Borehole yields are limited, curiously in sedimentary rocks, they are down the stairs 0.5 l/s, ho wever, those sited on faults and fractures in invasive rocks, can yield higher(prenominal) than 3 l/s. ordinary borehole learning ranges betwixt 40 and great hundred m temporary hookup the sightly range of foresight of water aim is amongst 10 to more(prenominal) than 40 m below ground level (mbgl) (DWA, 2011).