Abstract
Majority of Padang City residents inhabitant the region along sea shore for residential, public facility and economic center together with all of supporting facilities. That region is seismic prone area, also potentially affected by tsunami hazard and flood.This circumstances pushed local authority of Padang City to develop urban residential area to the north, east and south side of this city (Koto Tangah, Kuranji, Pauh, Lubuk Kilangan and Bungus Teluk Kabung sub-district), which are used to be water infiltration area. The function`s shifting of this area cause the change of soil density. This condition potentially causethe alteration of rainfall infiltration in to the soil.This research was conducted at 15 locations in Dadok Tunggul Hitam area, Koto Tangah sub-district (9 locations in development area and 6 locations in original area condition). Double Ring Infiltrometer are used in this study to predict infiltration rate and Sandcone for measuring soil density.This study used Horton Model to analyze infiltration rate by quantify infiltration rate data(f), constant infiltration rate (fc) and initial infiltration rate (fo). Moreover, regression analysis were used to quantify infiltration rate in order to determine its effects to soil density parameter.The results show that for high density soil (valuegd = 1,00 gr/cm3 to 1,50 gr/cm3), final soil infiltration rate in average is 0,1 mm/minuteto 0,9 mm/minute. This condition can cause decreasingof rainfall`s runoff infiltration capacity. Meanwhile, for low density of soil (valuegd = 0,30 gr/cm3to 1,00 gr/cm3), the infiltration rate value relatively high with final infiltartion rate reached 0,22 mm/minute. This analysis demonstrated that soil density influence the infiltration rate, where 23,7 % of infiltration capacity in Padang City development area is influenced by soil density parameter (gd), and the rest is influenced by other parameters
Highlights
Most of the population in Padang live in the lowland areas (30% of the total geographical area) used as settlement, centers of economic activity, and public buildings
Dadok Tunggul Hitam used to be a rainwater catchment area, the impact of development activities in the area changed the conversion of land into residential areas.The land use change is considered to have disrupted the chain of hydrological cycles caused by changing soil conditions such as soil density, soil porosity, soil density and others
The value of the coefficient of determination (R2) is 0.237 or 23.7%, and it shows that the contribution of soil density parameter to infiltration rate at development location of the city of Padang is 23.7%, the difference is influenced by other parameters
Summary
Most of the population in Padang live in the lowland areas (30% of the total geographical area) used as settlement, centers of economic activity, and public buildings. Dadok Tunggul Hitam used to be a rainwater catchment area, the impact of development activities in the area changed the conversion of land into residential areas.The land use change is considered to have disrupted the chain of hydrological cycles caused by changing soil conditions such as soil density, soil porosity, soil density and others. The impact is if there is rain with high-intensity water puddles are often quite high because of most of the rainwater into the flow of the surface and a small part into infiltration. The magnitude of infiltration is affected by the intensity of the rain, the slope of the soil surface, the land cover condition (vegetation), soil moisture and soil permeability, i.e. soil absorption. Measurement of soil density using sandcone was intended to determine the field density of the soil layer or the compacted soil pavement by measuring the volume of the hole directly, measured by determining the dry unit weight ( d), the greater the dry unit weight means, the smaller the void ratio (e)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
