CASE STUDY 13 — HWY 365 Large-Lot Neighborhood Large-Lot Residential Neighborhood | Civil Engineering & Private Road Design

PROJECT OVERVIEW

JRH Engineering provided complete civil engineering design for a large-lot residential neighborhood featuring 2–10 acre lots in Jefferson County, Texas. The site included an existing fishing pond and required private road permitting through Jefferson County and its drainage district. JRH moved fast by converting the existing fishing pond into a functional detention facility and designing a private road with open ditch drainage — delivering significant cost and time savings over conventional approaches.

AT A GLANCE

Site Civil Design

● Full civil design for large-lot neighborhood including road layout, grading, and drainage

● Private road designed with open ditch drainage — significantly lower construction cost than curb-and-gutter storm sewer, and faster to permit

● Existing fishing pond converted to detention facility — water surface elevation lowered to capture stormwater, outfall installed to adjacent ditch

● Lot layout designed around 2–10 acre parcels with private road access

Utility Infrastructure

● Individual water wells and septic systems for each lot — no municipal utility extensions required

● Per-lot utility approach eliminated all central utility permitting from the project scope

● No MUD or city utility coordination required

Stormwater & Drainage

● Existing fishing pond repurposed as the site's detention facility — lowering the water surface created storage volume without constructing a new pond

● Outfall installed from converted pond to adjacent drainage ditch — straightforward connection, no new pond construction required

● Open ditch road drainage eliminated underground storm sewer from the construction scope

Permitting & Agency Coordination

● Jefferson County and drainage district approvals pursued simultaneously

● Private road design eliminated city permitting entirely — county jurisdiction only

● Existing pond conversion simplified detention permitting — existing feature documented and credited rather than new facility designed

THE CHALLENGE

Large-lot rural neighborhoods have a different cost structure than urban subdivisions — infrastructure decisions that add modest cost per lot in a dense development become significant per-lot cost increases when lots are 2–10 acres. Every unnecessary infrastructure element directly impacts the economics. The site had an existing fishing pond that most engineers would have ignored or worked around — and a road alignment that defaulted to curb-and-gutter storm sewer.

JRH's Approach

JRH recognized the fishing pond as an asset, not an obstacle. By lowering the water surface elevation and installing an outfall, the existing pond became a compliant detention facility — eliminating the cost and time of building a new one. Private road design with open ditch drainage replaced what would have been a more expensive curb-and-gutter system, cutting both construction cost and the complexity of the storm sewer permitting package. Individual wells and septic kept utilities simple and cost-effective at the lot level.

The Result

A fully permitted large-lot neighborhood — delivered with existing site features converted to drainage infrastructure and a road design that cut construction cost without sacrificing county approval.

RESULTS

● New detention pond construction eliminated — existing fishing pond converted to compliant detention facility

● Construction cost reduced through open ditch private road drainage instead of curb-and-gutter storm sewer

● Utility permitting eliminated — individual wells and septic removed central utility coordination from the project entirely