Mr. Dhanji Mal

15-MS-HID-10

Degree Program

MS - Hydraulics, Irrigation & Drainage

District - Province

Tharparkar, Sindh

Email Address

[email protected]

GIS-Based Decision Support System for Runoff Harvesting Potential Sites: A Case Study of Karoonjhar Mountainous Area
  1. To collect and analyze meteorological data of the Koroonjhar Mountainous area for Frequency Analysis.
  2. To determine flow direction, flow accumulation, and delineation of the watershed using DEM of the area in ArcGIS.
  3. To quantify rainwater harvesting potential and water conservation sites of Koroonjhar Mountains using HEC-HMS.

Supervisor Name: Dr. Altaf Ali Siyal, Professor, USPCAS-W, MUET, Jamshoro

Co-Supervisor Name: Ghulam Hussain Dars, Assistant Professor, USPCAS-W, MUET, Jamshoro

The Karoonjhar mountainous area, situated at the southeast corner of Thar Desert, faces water scarcity most of the year due to erratic rainfall and limited groundwater resources. Though the area receives sufficient rainfall during the monsoon period, but due to unavailability of reliable data about rainfall runoff harvesting potential of the mountainous area, the local communities and the concerned public departments have not considered it seriously, to harvest all the runoff and conserve it in small dams and ponds for use during the dry periods.

Looking at the gravity of the problem, the present study was conducted to delineate watersheds, quantify runoff, and identify potential runoff conservation sites in Karoonjharmountainous area using Remote Sensing and GIS tools. Primary data were collected through ground truthing survey and soil sampling while secondary data about rainfall were obtained from Pakistan Meteorological Department, and the satellite data were obtained from USGS Global Visualization Viewer (GloVis) and The Japan Aerospace Exploration Agency (JAXA). The data were processed in ArcGIS 10.3 and HEC-Geo HMS for delineation of watersheds, flow paths and runoff generation due to rainfall storm. The present study revealed that the probability of return period of a rainstorm of 52.5 mm was optimum. For a single rainstorm event of 52.5 mm, runoff generated at Karoonjhar mountainous area was about 7055 acre-ft.

Thirteen small watersheds with a total area of 82314 acres were delineated for runoff harvesting. The curve number (CN) of the study area ranged from 54 to 100 and runoff was more sensitive to CN. Based on the historical rainfall data, runoff volume of 7055 acre-feet could be generated during monsoon period in every two years and 3527 acre-ft per year and conserved for domestic and other uses during the dry period. Based on the present study, it is recommended that the water conservation structures such as dams, ponds for each watershed, at identified places in the present study should be considered for construction.